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package java.lang;
The abstract class Number is the superclass of platform classes representing numeric values that are convertible to the primitive types byte, double, float,
int, long, and short. The specific semantics of the conversion from the numeric value of a particular Number implementation to a given primitive type is defined by the Number implementation in question. For platform classes, the conversion is often analogous to a narrowing primitive conversion or a widening primitive conversion as defined in The Java™ Language Specification for converting between primitive types. Therefore, conversions may lose information about the overall magnitude of a numeric value, may lose precision, and may even return a result of a different sign than the input. See the documentation of a given Number implementation for conversion details. Author: Lee Boynton, Arthur van Hoff @jls 5.1.2 Widening Primitive Conversions @jls 5.1.3 Narrowing Primitive Conversions Since: 1.0
/**
* The abstract class {@code Number} is the superclass of platform
* classes representing numeric values that are convertible to the
* primitive types {@code byte}, {@code double}, {@code float}, {@code
* int}, {@code long}, and {@code short}.
*
* The specific semantics of the conversion from the numeric value of
* a particular {@code Number} implementation to a given primitive
* type is defined by the {@code Number} implementation in question.
*
* For platform classes, the conversion is often analogous to a
* narrowing primitive conversion or a widening primitive conversion
* as defined in <cite>The Java™ Language Specification</cite>
* for converting between primitive types. Therefore, conversions may
* lose information about the overall magnitude of a numeric value, may
* lose precision, and may even return a result of a different sign
* than the input.
*
* See the documentation of a given {@code Number} implementation for
* conversion details.
*
* @author Lee Boynton
* @author Arthur van Hoff
* @jls 5.1.2 Widening Primitive Conversions
* @jls 5.1.3 Narrowing Primitive Conversions
* @since 1.0
*/
public abstract class Number implements java.io.Serializable {
Returns the value of the specified number as an int. Returns: the numeric value represented by this object after conversion to type int.
/**
* Returns the value of the specified number as an {@code int}.
*
* @return the numeric value represented by this object after conversion
* to type {@code int}.
*/
public abstract int intValue();
Returns the value of the specified number as a long. Returns: the numeric value represented by this object after conversion to type long.
/**
* Returns the value of the specified number as a {@code long}.
*
* @return the numeric value represented by this object after conversion
* to type {@code long}.
*/
public abstract long longValue();
Returns the value of the specified number as a float. Returns: the numeric value represented by this object after conversion to type float.
/**
* Returns the value of the specified number as a {@code float}.
*
* @return the numeric value represented by this object after conversion
* to type {@code float}.
*/
public abstract float floatValue();
Returns the value of the specified number as a double. Returns: the numeric value represented by this object after conversion to type double.
/**
* Returns the value of the specified number as a {@code double}.
*
* @return the numeric value represented by this object after conversion
* to type {@code double}.
*/
public abstract double doubleValue();
Returns the value of the specified number as a byte. This implementation returns the result of intValue cast to a byte.
Returns: the numeric value represented by this object after conversion to type byte. Since: 1.1
/**
* Returns the value of the specified number as a {@code byte}.
*
* <p>This implementation returns the result of {@link #intValue} cast
* to a {@code byte}.
*
* @return the numeric value represented by this object after conversion
* to type {@code byte}.
* @since 1.1
*/
public byte byteValue() {
return (byte)intValue();
}
Returns the value of the specified number as a short. This implementation returns the result of intValue cast to a short.
Returns: the numeric value represented by this object after conversion to type short. Since: 1.1
/**
* Returns the value of the specified number as a {@code short}.
*
* <p>This implementation returns the result of {@link #intValue} cast
* to a {@code short}.
*
* @return the numeric value represented by this object after conversion
* to type {@code short}.
* @since 1.1
*/
public short shortValue() {
return (short)intValue();
}
use serialVersionUID from JDK 1.0.2 for interoperability /** use serialVersionUID from JDK 1.0.2 for interoperability */
private static final long serialVersionUID = -8742448824652078965L;
}