http://openjdk.java.net/projects/code-tools/jmh/jmh-core/: The jmh is a Java harness for building, running, and analysing nano/micro/macro benchmarks written in Java and other languages targeting the JVM. (Oracle)
  • Aleksey Shipilev (Oracle/Sun, Red Hat)
  • Sergey Kuksenko (Oracle/Sun)
  • Anders Astrand (Oracle/BEA)
  • Staffan Friberg (Oracle/BEA)
  • Henrik Loef (Oracle/BEA) 
public class org.openjdk.jmh.util.Optional<T> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.openjdk.jmh.util.Optional
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 5691070564925468961

  private final T val;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: TT;

  private void <init>();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.openjdk.jmh.util.Optional this
        start local 1 // java.lang.Object val
         0: .line 38
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 39
            aload 1 /* val */
            ifnonnull 3
         2: .line 40
            new java.lang.IllegalArgumentException
            dup
            ldc "Val can not be null"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 42
      StackMap locals: org.openjdk.jmh.util.Optional java.lang.Object
      StackMap stack:
            aload 0 /* this */
            aload 1 /* val */
            putfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
         4: .line 43
            return
        end local 1 // java.lang.Object val
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;
            0    5     1   val  TT;
    Signature: (TT;)V
    MethodParameters:
      Name  Flags
      val   

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Optional this
         0: .line 45
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 46
            aload 0 /* this */
            aconst_null
            putfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
         2: .line 47
            return
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;

  public T orElse();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.openjdk.jmh.util.Optional this
        start local 1 // java.lang.Object elseVal
         0: .line 50
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnonnull 1
            aload 1 /* elseVal */
            goto 2
      StackMap locals:
      StackMap stack:
         1: aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
      StackMap locals:
      StackMap stack: java.lang.Object
         2: areturn
        end local 1 // java.lang.Object elseVal
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/openjdk/jmh/util/Optional<TT;>;
            0    3     1  elseVal  TT;
    Signature: (TT;)TT;
    MethodParameters:
         Name  Flags
      elseVal  

  public org.openjdk.jmh.util.Optional<T> orAnother(org.openjdk.jmh.util.Optional<T>);
    descriptor: (Lorg/openjdk/jmh/util/Optional;)Lorg/openjdk/jmh/util/Optional;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // org.openjdk.jmh.util.Optional this
        start local 1 // org.openjdk.jmh.util.Optional alternative
         0: .line 54
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnonnull 1
            aload 1 /* alternative */
            goto 2
      StackMap locals:
      StackMap stack:
         1: aload 0 /* this */
      StackMap locals:
      StackMap stack: org.openjdk.jmh.util.Optional
         2: areturn
        end local 1 // org.openjdk.jmh.util.Optional alternative
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    3     0         this  Lorg/openjdk/jmh/util/Optional<TT;>;
            0    3     1  alternative  Lorg/openjdk/jmh/util/Optional<TT;>;
    Signature: (Lorg/openjdk/jmh/util/Optional<TT;>;)Lorg/openjdk/jmh/util/Optional<TT;>;
    MethodParameters:
             Name  Flags
      alternative  

  public static <T> org.openjdk.jmh.util.Optional<T> none();
    descriptor: ()Lorg/openjdk/jmh/util/Optional;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 63
            new org.openjdk.jmh.util.Optional
            dup
            invokespecial org.openjdk.jmh.util.Optional.<init>:()V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <T:Ljava/lang/Object;>()Lorg/openjdk/jmh/util/Optional<TT;>;

  public static <T> org.openjdk.jmh.util.Optional<T> of(T);
    descriptor: (Ljava/lang/Object;)Lorg/openjdk/jmh/util/Optional;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.lang.Object val
         0: .line 73
            new org.openjdk.jmh.util.Optional
            dup
            aload 0 /* val */
            invokespecial org.openjdk.jmh.util.Optional.<init>:(Ljava/lang/Object;)V
            areturn
        end local 0 // java.lang.Object val
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0   val  TT;
    Signature: <T:Ljava/lang/Object;>(TT;)Lorg/openjdk/jmh/util/Optional<TT;>;
    MethodParameters:
      Name  Flags
      val   

  public static <T> org.openjdk.jmh.util.Optional<T> eitherOf(T);
    descriptor: (Ljava/lang/Object;)Lorg/openjdk/jmh/util/Optional;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // java.lang.Object val
         0: .line 77
            aload 0 /* val */
            ifnonnull 2
         1: .line 78
            invokestatic org.openjdk.jmh.util.Optional.none:()Lorg/openjdk/jmh/util/Optional;
            areturn
         2: .line 80
      StackMap locals:
      StackMap stack:
            aload 0 /* val */
            invokestatic org.openjdk.jmh.util.Optional.of:(Ljava/lang/Object;)Lorg/openjdk/jmh/util/Optional;
            areturn
        end local 0 // java.lang.Object val
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0   val  TT;
    Signature: <T:Ljava/lang/Object;>(TT;)Lorg/openjdk/jmh/util/Optional<TT;>;
    MethodParameters:
      Name  Flags
      val   

  public boolean hasValue();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Optional this
         0: .line 85
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Optional this
         0: .line 89
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnonnull 2
         1: .line 90
            ldc "[]"
            areturn
         2: .line 92
      StackMap locals:
      StackMap stack:
            new java.lang.StringBuilder
            dup
            ldc "["
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc "]"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;

  public T get();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Optional this
         0: .line 97
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnonnull 2
         1: .line 98
            new java.lang.IllegalStateException
            dup
            ldc "Optional is null"
            invokespecial java.lang.IllegalStateException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 100
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            areturn
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;
    Signature: ()TT;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.openjdk.jmh.util.Optional this
        start local 1 // java.lang.Object o
         0: .line 105
            aload 0 /* this */
            aload 1 /* o */
            if_acmpne 1
            iconst_1
            ireturn
         1: .line 106
      StackMap locals:
      StackMap stack:
            aload 1 /* o */
            ifnull 2
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            aload 1 /* o */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            if_acmpeq 3
      StackMap locals:
      StackMap stack:
         2: iconst_0
            ireturn
         3: .line 108
      StackMap locals:
      StackMap stack:
            aload 1 /* o */
            checkcast org.openjdk.jmh.util.Optional
            astore 2 /* optional */
        start local 2 // org.openjdk.jmh.util.Optional optional
         4: .line 110
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnull 5
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            aload 2 /* optional */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifne 7
            goto 6
      StackMap locals: org.openjdk.jmh.util.Optional
      StackMap stack:
         5: aload 2 /* optional */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnull 7
      StackMap locals:
      StackMap stack:
         6: iconst_0
            ireturn
         7: .line 112
      StackMap locals:
      StackMap stack:
            iconst_1
            ireturn
        end local 2 // org.openjdk.jmh.util.Optional optional
        end local 1 // java.lang.Object o
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    8     0      this  Lorg/openjdk/jmh/util/Optional<TT;>;
            0    8     1         o  Ljava/lang/Object;
            4    8     2  optional  Lorg/openjdk/jmh/util/Optional;
    MethodParameters:
      Name  Flags
      o     

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.openjdk.jmh.util.Optional this
         0: .line 117
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            ifnull 1
            aload 0 /* this */
            getfield org.openjdk.jmh.util.Optional.val:Ljava/lang/Object;
            invokevirtual java.lang.Object.hashCode:()I
            goto 2
      StackMap locals:
      StackMap stack:
         1: iconst_0
      StackMap locals:
      StackMap stack: int
         2: ireturn
        end local 0 // org.openjdk.jmh.util.Optional this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/openjdk/jmh/util/Optional<TT;>;
}
Signature: <T:Ljava/lang/Object;>Ljava/lang/Object;Ljava/io/Serializable;
SourceFile: "Optional.java"