https://openjdk.java.net/ 
/*
 * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 */

package java.lang.reflect;

import jdk.internal.misc.SharedSecrets;
import jdk.internal.reflect.CallerSensitive;
import jdk.internal.reflect.FieldAccessor;
import jdk.internal.reflect.Reflection;
import jdk.internal.vm.annotation.ForceInline;
import sun.reflect.generics.repository.FieldRepository;
import sun.reflect.generics.factory.CoreReflectionFactory;
import sun.reflect.generics.factory.GenericsFactory;
import sun.reflect.generics.scope.ClassScope;
import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Objects;
import sun.reflect.annotation.AnnotationParser;
import sun.reflect.annotation.AnnotationSupport;
import sun.reflect.annotation.TypeAnnotation;
import sun.reflect.annotation.TypeAnnotationParser;


A Field provides information about, and dynamic access to, a single field of a class or an interface. The reflected field may be a class (static) field or an instance field. 
A Field permits widening conversions to occur during a get or set access operation, but throws an IllegalArgumentException if a narrowing conversion would occur. 
Author:Kenneth Russell, Nakul Saraiya
See Also:
Since:1.1
/**
 * A {@code Field} provides information about, and dynamic access to, a
 * single field of a class or an interface.  The reflected field may
 * be a class (static) field or an instance field.
 *
 * <p>A {@code Field} permits widening conversions to occur during a get or
 * set access operation, but throws an {@code IllegalArgumentException} if a
 * narrowing conversion would occur.
 *
 * @see Member
 * @see java.lang.Class
 * @see java.lang.Class#getFields()
 * @see java.lang.Class#getField(String)
 * @see java.lang.Class#getDeclaredFields()
 * @see java.lang.Class#getDeclaredField(String)
 *
 * @author Kenneth Russell
 * @author Nakul Saraiya
 * @since 1.1
 */
public final
class Field extends AccessibleObject implements Member {

    private Class<?>            clazz;
    private int                 slot;
    // This is guaranteed to be interned by the VM in the 1.4
    // reflection implementation
    private String              name;
    private Class<?>            type;
    private int                 modifiers;
    // Generics and annotations support
    private transient String    signature;
    // generic info repository; lazily initialized
    private transient FieldRepository genericInfo;
    private byte[]              annotations;
    // Cached field accessor created without override
    private FieldAccessor fieldAccessor;
    // Cached field accessor created with override
    private FieldAccessor overrideFieldAccessor;
    // For sharing of FieldAccessors. This branching structure is
    // currently only two levels deep (i.e., one root Field and
    // potentially many Field objects pointing to it.)
    //
    // If this branching structure would ever contain cycles, deadlocks can
    // occur in annotation code.
    private Field               root;

    // Generics infrastructure

    private String getGenericSignature() {return signature;}

    // Accessor for factory
    private GenericsFactory getFactory() {
        Class<?> c = getDeclaringClass();
        // create scope and factory
        return CoreReflectionFactory.make(c, ClassScope.make(c));
    }

    // Accessor for generic info repository
    private FieldRepository getGenericInfo() {
        // lazily initialize repository if necessary
        if (genericInfo == null) {
            // create and cache generic info repository
            genericInfo = FieldRepository.make(getGenericSignature(),
                                               getFactory());
        }
        return genericInfo; //return cached repository
    }


    
Package-private constructor used by ReflectAccess to enable
instantiation of these objects in Java code from the java.lang
package via sun.reflect.LangReflectAccess.

/**
     * Package-private constructor used by ReflectAccess to enable
     * instantiation of these objects in Java code from the java.lang
     * package via sun.reflect.LangReflectAccess.
     */
    Field(Class<?> declaringClass,
          String name,
          Class<?> type,
          int modifiers,
          int slot,
          String signature,
          byte[] annotations)
    {
        this.clazz = declaringClass;
        this.name = name;
        this.type = type;
        this.modifiers = modifiers;
        this.slot = slot;
        this.signature = signature;
        this.annotations = annotations;
    }

    
Package-private routine (exposed to java.lang.Class via
ReflectAccess) which returns a copy of this Field. The copy's
"root" field points to this Field.

/**
     * Package-private routine (exposed to java.lang.Class via
     * ReflectAccess) which returns a copy of this Field. The copy's
     * "root" field points to this Field.
     */
    Field copy() {
        // This routine enables sharing of FieldAccessor objects
        // among Field objects which refer to the same underlying
        // method in the VM. (All of this contortion is only necessary
        // because of the "accessibility" bit in AccessibleObject,
        // which implicitly requires that new java.lang.reflect
        // objects be fabricated for each reflective call on Class
        // objects.)
        if (this.root != null)
            throw new IllegalArgumentException("Can not copy a non-root Field");

        Field res = new Field(clazz, name, type, modifiers, slot, signature, annotations);
        res.root = this;
        // Might as well eagerly propagate this if already present
        res.fieldAccessor = fieldAccessor;
        res.overrideFieldAccessor = overrideFieldAccessor;

        return res;
    }

    
Throws:
/**
     * @throws InaccessibleObjectException {@inheritDoc}
     * @throws SecurityException {@inheritDoc}
     */
    @Override
    @CallerSensitive
    public void setAccessible(boolean flag) {
        AccessibleObject.checkPermission();
        if (flag) checkCanSetAccessible(Reflection.getCallerClass());
        setAccessible0(flag);
    }

    @Override
    void checkCanSetAccessible(Class<?> caller) {
        checkCanSetAccessible(caller, clazz);
    }

    
Returns the Class object representing the class or interface that declares the field represented by this Field object. 
/**
     * Returns the {@code Class} object representing the class or interface
     * that declares the field represented by this {@code Field} object.
     */
    @Override
    public Class<?> getDeclaringClass() {
        return clazz;
    }

    
Returns the name of the field represented by this Field object. 
/**
     * Returns the name of the field represented by this {@code Field} object.
     */
    public String getName() {
        return name;
    }

    
Returns the Java language modifiers for the field represented by this Field object, as an integer. The Modifier class should be used to decode the modifiers. 
See Also:
/**
     * Returns the Java language modifiers for the field represented
     * by this {@code Field} object, as an integer. The {@code Modifier} class should
     * be used to decode the modifiers.
     *
     * @see Modifier
     */
    public int getModifiers() {
        return modifiers;
    }

    
Returns true if this field represents an element of an enumerated type; returns false otherwise. 
Returns:true if and only if this field represents an element of an enumerated type.
Since:1.5
/**
     * Returns {@code true} if this field represents an element of
     * an enumerated type; returns {@code false} otherwise.
     *
     * @return {@code true} if and only if this field represents an element of
     * an enumerated type.
     * @since 1.5
     */
    public boolean isEnumConstant() {
        return (getModifiers() & Modifier.ENUM) != 0;
    }

    
Returns true if this field is a synthetic field; returns false otherwise. 
Returns:true if and only if this field is a synthetic
field as defined by the Java Language Specification.
Since:1.5
/**
     * Returns {@code true} if this field is a synthetic
     * field; returns {@code false} otherwise.
     *
     * @return true if and only if this field is a synthetic
     * field as defined by the Java Language Specification.
     * @since 1.5
     */
    public boolean isSynthetic() {
        return Modifier.isSynthetic(getModifiers());
    }

    
Returns a Class object that identifies the declared type for the field represented by this Field object. 
Returns:a Class object identifying the declared type of the field represented by this object
/**
     * Returns a {@code Class} object that identifies the
     * declared type for the field represented by this
     * {@code Field} object.
     *
     * @return a {@code Class} object identifying the declared
     * type of the field represented by this object
     */
    public Class<?> getType() {
        return type;
    }

    
Returns a Type object that represents the declared type for the field represented by this Field object. 
If the Type is a parameterized type, the Type object returned must accurately reflect the actual type parameters used in the source code. 
If the type of the underlying field is a type variable or a
parameterized type, it is created. Otherwise, it is resolved.

Throws:
  • GenericSignatureFormatError – if the generic field
    signature does not conform to the format specified in
    The Java™ Virtual Machine Specification
  • TypeNotPresentException – if the generic type
    signature of the underlying field refers to a non-existent
    type declaration
  • MalformedParameterizedTypeException – if the generic
    signature of the underlying field refers to a parameterized type
    that cannot be instantiated for any reason
Returns:a Type object that represents the declared type for the field represented by this Field object
Since:1.5
/**
     * Returns a {@code Type} object that represents the declared type for
     * the field represented by this {@code Field} object.
     *
     * <p>If the {@code Type} is a parameterized type, the
     * {@code Type} object returned must accurately reflect the
     * actual type parameters used in the source code.
     *
     * <p>If the type of the underlying field is a type variable or a
     * parameterized type, it is created. Otherwise, it is resolved.
     *
     * @return a {@code Type} object that represents the declared type for
     *     the field represented by this {@code Field} object
     * @throws GenericSignatureFormatError if the generic field
     *     signature does not conform to the format specified in
     *     <cite>The Java&trade; Virtual Machine Specification</cite>
     * @throws TypeNotPresentException if the generic type
     *     signature of the underlying field refers to a non-existent
     *     type declaration
     * @throws MalformedParameterizedTypeException if the generic
     *     signature of the underlying field refers to a parameterized type
     *     that cannot be instantiated for any reason
     * @since 1.5
     */
    public Type getGenericType() {
        if (getGenericSignature() != null)
            return getGenericInfo().getGenericType();
        else
            return getType();
    }


    
Compares this Field against the specified object. Returns true if the objects are the same. Two Field objects are the same if they were declared by the same class and have the same name and type. 
/**
     * Compares this {@code Field} against the specified object.  Returns
     * true if the objects are the same.  Two {@code Field} objects are the same if
     * they were declared by the same class and have the same name
     * and type.
     */
    public boolean equals(Object obj) {
        if (obj != null && obj instanceof Field) {
            Field other = (Field)obj;
            return (getDeclaringClass() == other.getDeclaringClass())
                && (getName() == other.getName())
                && (getType() == other.getType());
        }
        return false;
    }

    
Returns a hashcode for this Field. This is computed as the exclusive-or of the hashcodes for the underlying field's declaring class name and its name. 
/**
     * Returns a hashcode for this {@code Field}.  This is computed as the
     * exclusive-or of the hashcodes for the underlying field's
     * declaring class name and its name.
     */
    public int hashCode() {
        return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
    }

    
Returns a string describing this Field. The format is the access modifiers for the field, if any, followed by the field type, followed by a space, followed by the fully-qualified name of the class declaring the field, followed by a period, followed by the name of the field. For example: 
   public static final int java.lang.Thread.MIN_PRIORITY
   private int java.io.FileDescriptor.fd



The modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: static, final, transient, volatile. 
Returns:a string describing this Field
@jls8.3.1 Field Modifiers
/**
     * Returns a string describing this {@code Field}.  The format is
     * the access modifiers for the field, if any, followed
     * by the field type, followed by a space, followed by
     * the fully-qualified name of the class declaring the field,
     * followed by a period, followed by the name of the field.
     * For example:
     * <pre>
     *    public static final int java.lang.Thread.MIN_PRIORITY
     *    private int java.io.FileDescriptor.fd
     * </pre>
     *
     * <p>The modifiers are placed in canonical order as specified by
     * "The Java Language Specification".  This is {@code public},
     * {@code protected} or {@code private} first, and then other
     * modifiers in the following order: {@code static}, {@code final},
     * {@code transient}, {@code volatile}.
     *
     * @return a string describing this {@code Field}
     * @jls 8.3.1 Field Modifiers
     */
    public String toString() {
        int mod = getModifiers();
        return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
            + getType().getTypeName() + " "
            + getDeclaringClass().getTypeName() + "."
            + getName());
    }

    @Override
    String toShortString() {
        return "field " + getDeclaringClass().getTypeName() + "." + getName();
    }

    
Returns a string describing this Field, including its generic type. The format is the access modifiers for the field, if any, followed by the generic field type, followed by a space, followed by the fully-qualified name of the class declaring the field, followed by a period, followed by the name of the field. 
The modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: static, final, transient, volatile. 
Returns:a string describing this Field, including its generic type
Since:1.5
@jls8.3.1 Field Modifiers
/**
     * Returns a string describing this {@code Field}, including
     * its generic type.  The format is the access modifiers for the
     * field, if any, followed by the generic field type, followed by
     * a space, followed by the fully-qualified name of the class
     * declaring the field, followed by a period, followed by the name
     * of the field.
     *
     * <p>The modifiers are placed in canonical order as specified by
     * "The Java Language Specification".  This is {@code public},
     * {@code protected} or {@code private} first, and then other
     * modifiers in the following order: {@code static}, {@code final},
     * {@code transient}, {@code volatile}.
     *
     * @return a string describing this {@code Field}, including
     * its generic type
     *
     * @since 1.5
     * @jls 8.3.1 Field Modifiers
     */
    public String toGenericString() {
        int mod = getModifiers();
        Type fieldType = getGenericType();
        return (((mod == 0) ? "" : (Modifier.toString(mod) + " "))
            + fieldType.getTypeName() + " "
            + getDeclaringClass().getTypeName() + "."
            + getName());
    }

    
Returns the value of the field represented by this Field, on the specified object. The value is automatically wrapped in an object if it has a primitive type. 
The underlying field's value is obtained as follows:

If the underlying field is a static field, the obj argument is ignored; it may be null. 
Otherwise, the underlying field is an instance field. If the specified obj argument is null, the method throws a NullPointerException. If the specified object is not an instance of the class or interface declaring the underlying field, the method throws an IllegalArgumentException. 
If this Field object is enforcing Java language access control, and the underlying field is inaccessible, the method throws an IllegalAccessException. If the underlying field is static, the class that declared the field is initialized if it has not already been initialized. 
Otherwise, the value is retrieved from the underlying instance
or static field.  If the field has a primitive type, the value
is wrapped in an object before being returned, otherwise it is
returned as is.

If the field is hidden in the type of obj, the field's value is obtained according to the preceding rules. 
Params:
  • obj – object from which the represented field's value is
to be extracted
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof).
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
Returns:the value of the represented field in object obj; primitive values are wrapped in an appropriate object before being returned
/**
     * Returns the value of the field represented by this {@code Field}, on
     * the specified object. The value is automatically wrapped in an
     * object if it has a primitive type.
     *
     * <p>The underlying field's value is obtained as follows:
     *
     * <p>If the underlying field is a static field, the {@code obj} argument
     * is ignored; it may be null.
     *
     * <p>Otherwise, the underlying field is an instance field.  If the
     * specified {@code obj} argument is null, the method throws a
     * {@code NullPointerException}. If the specified object is not an
     * instance of the class or interface declaring the underlying
     * field, the method throws an {@code IllegalArgumentException}.
     *
     * <p>If this {@code Field} object is enforcing Java language access control, and
     * the underlying field is inaccessible, the method throws an
     * {@code IllegalAccessException}.
     * If the underlying field is static, the class that declared the
     * field is initialized if it has not already been initialized.
     *
     * <p>Otherwise, the value is retrieved from the underlying instance
     * or static field.  If the field has a primitive type, the value
     * is wrapped in an object before being returned, otherwise it is
     * returned as is.
     *
     * <p>If the field is hidden in the type of {@code obj},
     * the field's value is obtained according to the preceding rules.
     *
     * @param obj object from which the represented field's value is
     * to be extracted
     * @return the value of the represented field in object
     * {@code obj}; primitive values are wrapped in an appropriate
     * object before being returned
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof).
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public Object get(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).get(obj);
    }

    
Gets the value of a static or instance boolean field. 
Params:
  • obj – the object to extract the boolean value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type boolean by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the boolean field
/**
     * Gets the value of a static or instance {@code boolean} field.
     *
     * @param obj the object to extract the {@code boolean} value
     * from
     * @return the value of the {@code boolean} field
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code boolean} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public boolean getBoolean(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getBoolean(obj);
    }

    
Gets the value of a static or instance byte field. 
Params:
  • obj – the object to extract the byte value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type byte by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the byte field
/**
     * Gets the value of a static or instance {@code byte} field.
     *
     * @param obj the object to extract the {@code byte} value
     * from
     * @return the value of the {@code byte} field
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code byte} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public byte getByte(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getByte(obj);
    }

    
Gets the value of a static or instance field of type char or of another primitive type convertible to type char via a widening conversion. 
Params:
  • obj – the object to extract the char value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type char by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type char
/**
     * Gets the value of a static or instance field of type
     * {@code char} or of another primitive type convertible to
     * type {@code char} via a widening conversion.
     *
     * @param obj the object to extract the {@code char} value
     * from
     * @return the value of the field converted to type {@code char}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code char} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public char getChar(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getChar(obj);
    }

    
Gets the value of a static or instance field of type short or of another primitive type convertible to type short via a widening conversion. 
Params:
  • obj – the object to extract the short value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type short by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type short
/**
     * Gets the value of a static or instance field of type
     * {@code short} or of another primitive type convertible to
     * type {@code short} via a widening conversion.
     *
     * @param obj the object to extract the {@code short} value
     * from
     * @return the value of the field converted to type {@code short}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code short} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public short getShort(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getShort(obj);
    }

    
Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion. 
Params:
  • obj – the object to extract the int value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type int by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type int
/**
     * Gets the value of a static or instance field of type
     * {@code int} or of another primitive type convertible to
     * type {@code int} via a widening conversion.
     *
     * @param obj the object to extract the {@code int} value
     * from
     * @return the value of the field converted to type {@code int}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code int} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public int getInt(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getInt(obj);
    }

    
Gets the value of a static or instance field of type long or of another primitive type convertible to type long via a widening conversion. 
Params:
  • obj – the object to extract the long value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type long by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type long
/**
     * Gets the value of a static or instance field of type
     * {@code long} or of another primitive type convertible to
     * type {@code long} via a widening conversion.
     *
     * @param obj the object to extract the {@code long} value
     * from
     * @return the value of the field converted to type {@code long}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code long} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public long getLong(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getLong(obj);
    }

    
Gets the value of a static or instance field of type float or of another primitive type convertible to type float via a widening conversion. 
Params:
  • obj – the object to extract the float value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type float by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type float
/**
     * Gets the value of a static or instance field of type
     * {@code float} or of another primitive type convertible to
     * type {@code float} via a widening conversion.
     *
     * @param obj the object to extract the {@code float} value
     * from
     * @return the value of the field converted to type {@code float}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code float} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public float getFloat(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getFloat(obj);
    }

    
Gets the value of a static or instance field of type double or of another primitive type convertible to type double via a widening conversion. 
Params:
  • obj – the object to extract the double value from
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is inaccessible.
  • IllegalArgumentException –  if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type double by a widening conversion.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
Returns:the value of the field converted to type double
/**
     * Gets the value of a static or instance field of type
     * {@code double} or of another primitive type convertible to
     * type {@code double} via a widening conversion.
     *
     * @param obj the object to extract the {@code double} value
     * from
     * @return the value of the field converted to type {@code double}
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is inaccessible.
     * @exception IllegalArgumentException  if the specified object is not
     *              an instance of the class or interface declaring the
     *              underlying field (or a subclass or implementor
     *              thereof), or if the field value cannot be
     *              converted to the type {@code double} by a
     *              widening conversion.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#get
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public double getDouble(Object obj)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        return getFieldAccessor(obj).getDouble(obj);
    }

    
Sets the field represented by this Field object on the specified object argument to the specified new value. The new value is automatically unwrapped if the underlying field has a primitive type. 
The operation proceeds as follows:

If the underlying field is static, the obj argument is ignored; it may be null. 
Otherwise the underlying field is an instance field. If the specified object argument is null, the method throws a NullPointerException. If the specified object argument is not an instance of the class or interface declaring the underlying field, the method throws an IllegalArgumentException. 
If this Field object is enforcing Java language access control, and the underlying field is inaccessible, the method throws an IllegalAccessException. 
If the underlying field is final, the method throws an IllegalAccessException unless setAccessible(true) has succeeded for this Field object and the field is non-static. Setting a final field in this way is meaningful only during deserialization or reconstruction of instances of classes with blank final fields, before they are made available for access by other parts of a program. Use in any other context may have unpredictable effects, including cases in which other parts of a program continue to use the original value of this field. 
If the underlying field is of a primitive type, an unwrapping conversion is attempted to convert the new value to a value of a primitive type. If this attempt fails, the method throws an IllegalArgumentException. 
If, after possible unwrapping, the new value cannot be converted to the type of the underlying field by an identity or widening conversion, the method throws an IllegalArgumentException. 
If the underlying field is static, the class that declared the
field is initialized if it has not already been initialized.

The field is set to the possibly unwrapped and widened new value.

If the field is hidden in the type of obj, the field's value is set according to the preceding rules. 
Params:
  • obj – the object whose field should be modified
  • value – the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
/**
     * Sets the field represented by this {@code Field} object on the
     * specified object argument to the specified new value. The new
     * value is automatically unwrapped if the underlying field has a
     * primitive type.
     *
     * <p>The operation proceeds as follows:
     *
     * <p>If the underlying field is static, the {@code obj} argument is
     * ignored; it may be null.
     *
     * <p>Otherwise the underlying field is an instance field.  If the
     * specified object argument is null, the method throws a
     * {@code NullPointerException}.  If the specified object argument is not
     * an instance of the class or interface declaring the underlying
     * field, the method throws an {@code IllegalArgumentException}.
     *
     * <p>If this {@code Field} object is enforcing Java language access control, and
     * the underlying field is inaccessible, the method throws an
     * {@code IllegalAccessException}.
     *
     * <p>If the underlying field is final, the method throws an
     * {@code IllegalAccessException} unless {@code setAccessible(true)}
     * has succeeded for this {@code Field} object
     * and the field is non-static. Setting a final field in this way
     * is meaningful only during deserialization or reconstruction of
     * instances of classes with blank final fields, before they are
     * made available for access by other parts of a program. Use in
     * any other context may have unpredictable effects, including cases
     * in which other parts of a program continue to use the original
     * value of this field.
     *
     * <p>If the underlying field is of a primitive type, an unwrapping
     * conversion is attempted to convert the new value to a value of
     * a primitive type.  If this attempt fails, the method throws an
     * {@code IllegalArgumentException}.
     *
     * <p>If, after possible unwrapping, the new value cannot be
     * converted to the type of the underlying field by an identity or
     * widening conversion, the method throws an
     * {@code IllegalArgumentException}.
     *
     * <p>If the underlying field is static, the class that declared the
     * field is initialized if it has not already been initialized.
     *
     * <p>The field is set to the possibly unwrapped and widened new value.
     *
     * <p>If the field is hidden in the type of {@code obj},
     * the field's value is set according to the preceding rules.
     *
     * @param obj the object whose field should be modified
     * @param value the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void set(Object obj, Object value)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).set(obj, value);
    }

    
Sets the value of a field as a boolean on the specified object. This method is equivalent to set(obj, zObj), where zObj is a Boolean object and zObj.booleanValue() == z. 
Params:
  • obj – the object whose field should be modified
  • z –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code boolean} on the specified object.
     * This method is equivalent to
     * {@code set(obj, zObj)},
     * where {@code zObj} is a {@code Boolean} object and
     * {@code zObj.booleanValue() == z}.
     *
     * @param obj the object whose field should be modified
     * @param z   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setBoolean(Object obj, boolean z)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setBoolean(obj, z);
    }

    
Sets the value of a field as a byte on the specified object. This method is equivalent to set(obj, bObj), where bObj is a Byte object and bObj.byteValue() == b. 
Params:
  • obj – the object whose field should be modified
  • b –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code byte} on the specified object.
     * This method is equivalent to
     * {@code set(obj, bObj)},
     * where {@code bObj} is a {@code Byte} object and
     * {@code bObj.byteValue() == b}.
     *
     * @param obj the object whose field should be modified
     * @param b   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setByte(Object obj, byte b)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setByte(obj, b);
    }

    
Sets the value of a field as a char on the specified object. This method is equivalent to set(obj, cObj), where cObj is a Character object and cObj.charValue() == c. 
Params:
  • obj – the object whose field should be modified
  • c –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code char} on the specified object.
     * This method is equivalent to
     * {@code set(obj, cObj)},
     * where {@code cObj} is a {@code Character} object and
     * {@code cObj.charValue() == c}.
     *
     * @param obj the object whose field should be modified
     * @param c   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setChar(Object obj, char c)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setChar(obj, c);
    }

    
Sets the value of a field as a short on the specified object. This method is equivalent to set(obj, sObj), where sObj is a Short object and sObj.shortValue() == s. 
Params:
  • obj – the object whose field should be modified
  • s –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code short} on the specified object.
     * This method is equivalent to
     * {@code set(obj, sObj)},
     * where {@code sObj} is a {@code Short} object and
     * {@code sObj.shortValue() == s}.
     *
     * @param obj the object whose field should be modified
     * @param s   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setShort(Object obj, short s)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setShort(obj, s);
    }

    
Sets the value of a field as an int on the specified object. This method is equivalent to set(obj, iObj), where iObj is an Integer object and iObj.intValue() == i. 
Params:
  • obj – the object whose field should be modified
  • i –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as an {@code int} on the specified object.
     * This method is equivalent to
     * {@code set(obj, iObj)},
     * where {@code iObj} is an {@code Integer} object and
     * {@code iObj.intValue() == i}.
     *
     * @param obj the object whose field should be modified
     * @param i   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setInt(Object obj, int i)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setInt(obj, i);
    }

    
Sets the value of a field as a long on the specified object. This method is equivalent to set(obj, lObj), where lObj is a Long object and lObj.longValue() == l. 
Params:
  • obj – the object whose field should be modified
  • l –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code long} on the specified object.
     * This method is equivalent to
     * {@code set(obj, lObj)},
     * where {@code lObj} is a {@code Long} object and
     * {@code lObj.longValue() == l}.
     *
     * @param obj the object whose field should be modified
     * @param l   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setLong(Object obj, long l)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setLong(obj, l);
    }

    
Sets the value of a field as a float on the specified object. This method is equivalent to set(obj, fObj), where fObj is a Float object and fObj.floatValue() == f. 
Params:
  • obj – the object whose field should be modified
  • f –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code float} on the specified object.
     * This method is equivalent to
     * {@code set(obj, fObj)},
     * where {@code fObj} is a {@code Float} object and
     * {@code fObj.floatValue() == f}.
     *
     * @param obj the object whose field should be modified
     * @param f   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setFloat(Object obj, float f)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setFloat(obj, f);
    }

    
Sets the value of a field as a double on the specified object. This method is equivalent to set(obj, dObj), where dObj is a Double object and dObj.doubleValue() == d. 
Params:
  • obj – the object whose field should be modified
  • d –  the new value for the field of obj being modified
Throws:
  • IllegalAccessException –  if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
  • IllegalArgumentException –  if the specified object is not an
             instance of the class or interface declaring the underlying
             field (or a subclass or implementor thereof),
             or if an unwrapping conversion fails.
  • NullPointerException –      if the specified object is null
             and the field is an instance field.
  • ExceptionInInitializerError – if the initialization provoked
             by this method fails.
See Also:
/**
     * Sets the value of a field as a {@code double} on the specified object.
     * This method is equivalent to
     * {@code set(obj, dObj)},
     * where {@code dObj} is a {@code Double} object and
     * {@code dObj.doubleValue() == d}.
     *
     * @param obj the object whose field should be modified
     * @param d   the new value for the field of {@code obj}
     * being modified
     *
     * @exception IllegalAccessException    if this {@code Field} object
     *              is enforcing Java language access control and the underlying
     *              field is either inaccessible or final.
     * @exception IllegalArgumentException  if the specified object is not an
     *              instance of the class or interface declaring the underlying
     *              field (or a subclass or implementor thereof),
     *              or if an unwrapping conversion fails.
     * @exception NullPointerException      if the specified object is null
     *              and the field is an instance field.
     * @exception ExceptionInInitializerError if the initialization provoked
     *              by this method fails.
     * @see       Field#set
     */
    @CallerSensitive
    @ForceInline // to ensure Reflection.getCallerClass optimization
    public void setDouble(Object obj, double d)
        throws IllegalArgumentException, IllegalAccessException
    {
        if (!override) {
            Class<?> caller = Reflection.getCallerClass();
            checkAccess(caller, obj);
        }
        getFieldAccessor(obj).setDouble(obj, d);
    }

    // check access to field
    private void checkAccess(Class<?> caller, Object obj)
        throws IllegalAccessException
    {
        checkAccess(caller, clazz,
                    Modifier.isStatic(modifiers) ? null : obj.getClass(),
                    modifiers);
    }

    // security check is done before calling this method
    private FieldAccessor getFieldAccessor(Object obj)
        throws IllegalAccessException
    {
        boolean ov = override;
        FieldAccessor a = (ov) ? overrideFieldAccessor : fieldAccessor;
        return (a != null) ? a : acquireFieldAccessor(ov);
    }

    // NOTE that there is no synchronization used here. It is correct
    // (though not efficient) to generate more than one FieldAccessor
    // for a given Field. However, avoiding synchronization will
    // probably make the implementation more scalable.
    private FieldAccessor acquireFieldAccessor(boolean overrideFinalCheck) {
        // First check to see if one has been created yet, and take it
        // if so
        FieldAccessor tmp = null;
        if (root != null) tmp = root.getFieldAccessor(overrideFinalCheck);
        if (tmp != null) {
            if (overrideFinalCheck)
                overrideFieldAccessor = tmp;
            else
                fieldAccessor = tmp;
        } else {
            // Otherwise fabricate one and propagate it up to the root
            tmp = reflectionFactory.newFieldAccessor(this, overrideFinalCheck);
            setFieldAccessor(tmp, overrideFinalCheck);
        }

        return tmp;
    }

    // Returns FieldAccessor for this Field object, not looking up
    // the chain to the root
    private FieldAccessor getFieldAccessor(boolean overrideFinalCheck) {
        return (overrideFinalCheck)? overrideFieldAccessor : fieldAccessor;
    }

    // Sets the FieldAccessor for this Field object and
    // (recursively) its root
    private void setFieldAccessor(FieldAccessor accessor, boolean overrideFinalCheck) {
        if (overrideFinalCheck)
            overrideFieldAccessor = accessor;
        else
            fieldAccessor = accessor;
        // Propagate up
        if (root != null) {
            root.setFieldAccessor(accessor, overrideFinalCheck);
        }
    }

    @Override
    Field getRoot() {
        return root;
    }

    
Throws:
  • NullPointerException – {@inheritDoc}
Since:1.5
/**
     * @throws NullPointerException {@inheritDoc}
     * @since 1.5
     */
    public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
        Objects.requireNonNull(annotationClass);
        return annotationClass.cast(declaredAnnotations().get(annotationClass));
    }

    
{@inheritDoc}

Throws:
Since:1.8
/**
     * {@inheritDoc}
     * @throws NullPointerException {@inheritDoc}
     * @since 1.8
     */
    @Override
    public <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) {
        Objects.requireNonNull(annotationClass);

        return AnnotationSupport.getDirectlyAndIndirectlyPresent(declaredAnnotations(), annotationClass);
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    public Annotation[] getDeclaredAnnotations()  {
        return AnnotationParser.toArray(declaredAnnotations());
    }

    private transient volatile Map<Class<? extends Annotation>, Annotation> declaredAnnotations;

    private Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
        Map<Class<? extends Annotation>, Annotation> declAnnos;
        if ((declAnnos = declaredAnnotations) == null) {
            synchronized (this) {
                if ((declAnnos = declaredAnnotations) == null) {
                    Field root = this.root;
                    if (root != null) {
                        declAnnos = root.declaredAnnotations();
                    } else {
                        declAnnos = AnnotationParser.parseAnnotations(
                                annotations,
                                SharedSecrets.getJavaLangAccess()
                                        .getConstantPool(getDeclaringClass()),
                                getDeclaringClass());
                    }
                    declaredAnnotations = declAnnos;
                }
            }
        }
        return declAnnos;
    }

    private native byte[] getTypeAnnotationBytes0();

    
Returns an AnnotatedType object that represents the use of a type to specify
the declared type of the field represented by this Field.

Returns:an object representing the declared type of the field
represented by this Field
Since:1.8
/**
     * Returns an AnnotatedType object that represents the use of a type to specify
     * the declared type of the field represented by this Field.
     * @return an object representing the declared type of the field
     * represented by this Field
     *
     * @since 1.8
     */
    public AnnotatedType getAnnotatedType() {
        return TypeAnnotationParser.buildAnnotatedType(getTypeAnnotationBytes0(),
                                                       SharedSecrets.getJavaLangAccess().
                                                           getConstantPool(getDeclaringClass()),
                                                       this,
                                                       getDeclaringClass(),
                                                       getGenericType(),
                                                       TypeAnnotation.TypeAnnotationTarget.FIELD);
}
}