http://fastutil.di.unimi.it/: fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.
  • Sebastiano Vigna 
public final class it.unimi.dsi.fastutil.ints.Int2IntFunctions
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: it.unimi.dsi.fastutil.ints.Int2IntFunctions
  super_class: java.lang.Object
{
  public static final it.unimi.dsi.fastutil.ints.Int2IntFunctions$EmptyFunction EMPTY_FUNCTION;
    descriptor: Lit/unimi/dsi/fastutil/ints/Int2IntFunctions$EmptyFunction;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 89
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$EmptyFunction
            dup
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$EmptyFunction.<init>:()V
            putstatic it.unimi.dsi.fastutil.ints.Int2IntFunctions.EMPTY_FUNCTION:Lit/unimi/dsi/fastutil/ints/Int2IntFunctions$EmptyFunction;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunctions this
         0: .line 26
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 27
            return
        end local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunctions this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lit/unimi/dsi/fastutil/ints/Int2IntFunctions;

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction singleton(int, int);
    descriptor: (II)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // int key
        start local 1 // int value
         0: .line 143
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton
            dup
            iload 0 /* key */
            iload 1 /* value */
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton.<init>:(II)V
            areturn
        end local 1 // int value
        end local 0 // int key
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0    key  I
            0    1     1  value  I
    MethodParameters:
       Name  Flags
      key    final
      value  

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction singleton(java.lang.Integer, java.lang.Integer);
    descriptor: (Ljava/lang/Integer;Ljava/lang/Integer;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // java.lang.Integer key
        start local 1 // java.lang.Integer value
         0: .line 161
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton
            dup
            aload 0 /* key */
            invokevirtual java.lang.Integer.intValue:()I
            aload 1 /* value */
            invokevirtual java.lang.Integer.intValue:()I
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton.<init>:(II)V
            areturn
        end local 1 // java.lang.Integer value
        end local 0 // java.lang.Integer key
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0    key  Ljava/lang/Integer;
            0    1     1  value  Ljava/lang/Integer;
    MethodParameters:
       Name  Flags
      key    final
      value  final

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction synchronize(it.unimi.dsi.fastutil.ints.Int2IntFunction);
    descriptor: (Lit/unimi/dsi/fastutil/ints/Int2IntFunction;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
         0: .line 325
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction
            dup
            aload 0 /* f */
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction.<init>:(Lit/unimi/dsi/fastutil/ints/Int2IntFunction;)V
            areturn
        end local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0     f  Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    MethodParameters:
      Name  Flags
      f     final

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction synchronize(it.unimi.dsi.fastutil.ints.Int2IntFunction, java.lang.Object);
    descriptor: (Lit/unimi/dsi/fastutil/ints/Int2IntFunction;Ljava/lang/Object;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
        start local 1 // java.lang.Object sync
         0: .line 340
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction
            dup
            aload 0 /* f */
            aload 1 /* sync */
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction.<init>:(Lit/unimi/dsi/fastutil/ints/Int2IntFunction;Ljava/lang/Object;)V
            areturn
        end local 1 // java.lang.Object sync
        end local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0     f  Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
            0    1     1  sync  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      f     final
      sync  final

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction unmodifiable(it.unimi.dsi.fastutil.ints.Int2IntFunction);
    descriptor: (Lit/unimi/dsi/fastutil/ints/Int2IntFunction;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
         0: .line 436
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$UnmodifiableFunction
            dup
            aload 0 /* f */
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$UnmodifiableFunction.<init>:(Lit/unimi/dsi/fastutil/ints/Int2IntFunction;)V
            areturn
        end local 0 // it.unimi.dsi.fastutil.ints.Int2IntFunction f
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0     f  Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    MethodParameters:
      Name  Flags
      f     final

  public static it.unimi.dsi.fastutil.ints.Int2IntFunction primitive(java.util.function.Function<? super java.lang.Integer, ? extends java.lang.Integer>);
    descriptor: (Ljava/util/function/Function;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // java.util.function.Function f
         0: .line 504
            aload 0 /* f */
            invokestatic java.util.Objects.requireNonNull:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 505
            aload 0 /* f */
            instanceof it.unimi.dsi.fastutil.ints.Int2IntFunction
            ifeq 3
         2: .line 506
            aload 0 /* f */
            checkcast it.unimi.dsi.fastutil.ints.Int2IntFunction
            areturn
         3: .line 507
      StackMap locals:
      StackMap stack:
            aload 0 /* f */
            instanceof java.util.function.IntUnaryOperator
            ifeq 5
         4: .line 508
            aload 0 /* f */
            checkcast java.util.function.IntUnaryOperator
            dup
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            pop
            invokedynamic get(Ljava/util/function/IntUnaryOperator;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (I)I
                  java/util/function/IntUnaryOperator.applyAsInt(I)I (9 itf)
                  (I)I
            areturn
         5: .line 509
      StackMap locals:
      StackMap stack:
            new it.unimi.dsi.fastutil.ints.Int2IntFunctions$PrimitiveFunction
            dup
            aload 0 /* f */
            invokespecial it.unimi.dsi.fastutil.ints.Int2IntFunctions$PrimitiveFunction.<init>:(Ljava/util/function/Function;)V
            areturn
        end local 0 // java.util.function.Function f
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0     f  Ljava/util/function/Function<-Ljava/lang/Integer;+Ljava/lang/Integer;>;
    Signature: (Ljava/util/function/Function<-Ljava/lang/Integer;+Ljava/lang/Integer;>;)Lit/unimi/dsi/fastutil/ints/Int2IntFunction;
    MethodParameters:
      Name  Flags
      f     final
}
SourceFile: "Int2IntFunctions.java"
NestMembers:
  it.unimi.dsi.fastutil.ints.Int2IntFunctions$EmptyFunction  it.unimi.dsi.fastutil.ints.Int2IntFunctions$PrimitiveFunction  it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton  it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction  it.unimi.dsi.fastutil.ints.Int2IntFunctions$UnmodifiableFunction
InnerClasses:
  public EmptyFunction = it.unimi.dsi.fastutil.ints.Int2IntFunctions$EmptyFunction of it.unimi.dsi.fastutil.ints.Int2IntFunctions
  public PrimitiveFunction = it.unimi.dsi.fastutil.ints.Int2IntFunctions$PrimitiveFunction of it.unimi.dsi.fastutil.ints.Int2IntFunctions
  public Singleton = it.unimi.dsi.fastutil.ints.Int2IntFunctions$Singleton of it.unimi.dsi.fastutil.ints.Int2IntFunctions
  public SynchronizedFunction = it.unimi.dsi.fastutil.ints.Int2IntFunctions$SynchronizedFunction of it.unimi.dsi.fastutil.ints.Int2IntFunctions
  public UnmodifiableFunction = it.unimi.dsi.fastutil.ints.Int2IntFunctions$UnmodifiableFunction of it.unimi.dsi.fastutil.ints.Int2IntFunctions
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles