https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
class org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView extends org.eclipse.collections.impl.lazy.AbstractLazyIterable<K>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView
  super_class: org.eclipse.collections.impl.lazy.AbstractLazyIterable
{
  final org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap this$0;
    descriptor: Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private void <init>(org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
         0: .line 1961
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.lazy.AbstractLazyIterable.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;
    MethodParameters:
        Name  Flags
      this$0  final

  public void each(org.eclipse.collections.api.block.procedure.Procedure<? super K>);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/Procedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
        start local 1 // org.eclipse.collections.api.block.procedure.Procedure procedure
         0: .line 1966
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            aload 1 /* procedure */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.forEachKey:(Lorg/eclipse/collections/api/block/procedure/Procedure;)V
         1: .line 1967
            return
        end local 1 // org.eclipse.collections.api.block.procedure.Procedure procedure
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;
            0    2     1  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure<-TK;>;
    Signature: (Lorg/eclipse/collections/api/block/procedure/Procedure<-TK;>;)V
    MethodParameters:
           Name  Flags
      procedure  

  public void forEachWithIndex(org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure<? super K>);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
        start local 1 // org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure objectIntProcedure
         0: .line 1972
            iconst_0
            istore 2 /* index */
        start local 2 // int index
         1: .line 1973
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         2: goto 7
         3: .line 1975
      StackMap locals: int int
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            iload 3 /* i */
            aaload
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.isNonSentinel:(Ljava/lang/Object;)Z
            ifeq 6
         4: .line 1977
            aload 1 /* objectIntProcedure */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            iload 3 /* i */
            aaload
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.toNonSentinel:(Ljava/lang/Object;)Ljava/lang/Object;
            iload 2 /* index */
            invokeinterface org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure.value:(Ljava/lang/Object;I)V
         5: .line 1978
            iinc 2 /* index */ 1
         6: .line 1973
      StackMap locals:
      StackMap stack:
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         7: iload 3 /* i */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            arraylength
            if_icmplt 3
        end local 3 // int i
         8: .line 1981
            return
        end local 2 // int index
        end local 1 // org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure objectIntProcedure
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    9     0                this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;
            0    9     1  objectIntProcedure  Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure<-TK;>;
            1    9     2               index  I
            2    8     3                   i  I
    Signature: (Lorg/eclipse/collections/api/block/procedure/primitive/ObjectIntProcedure<-TK;>;)V
    MethodParameters:
                    Name  Flags
      objectIntProcedure  

  public <P> void forEachWith(org.eclipse.collections.api.block.procedure.Procedure2<? super K, ? super P>, );
    descriptor: (Lorg/eclipse/collections/api/block/procedure/Procedure2;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
        start local 1 // org.eclipse.collections.api.block.procedure.Procedure2 procedure
        start local 2 // java.lang.Object parameter
         0: .line 1986
            iconst_0
            istore 3 /* i */
        start local 3 // int i
         1: goto 5
         2: .line 1988
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            iload 3 /* i */
            aaload
            invokestatic org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.isNonSentinel:(Ljava/lang/Object;)Z
            ifeq 4
         3: .line 1990
            aload 1 /* procedure */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            iload 3 /* i */
            aaload
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.toNonSentinel:(Ljava/lang/Object;)Ljava/lang/Object;
            aload 2 /* parameter */
            invokeinterface org.eclipse.collections.api.block.procedure.Procedure2.value:(Ljava/lang/Object;Ljava/lang/Object;)V
         4: .line 1986
      StackMap locals:
      StackMap stack:
            iinc 3 /* i */ 1
      StackMap locals:
      StackMap stack:
         5: iload 3 /* i */
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap.keys:[Ljava/lang/Object;
            arraylength
            if_icmplt 2
        end local 3 // int i
         6: .line 1993
            return
        end local 2 // java.lang.Object parameter
        end local 1 // org.eclipse.collections.api.block.procedure.Procedure2 procedure
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    7     0       this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;
            0    7     1  procedure  Lorg/eclipse/collections/api/block/procedure/Procedure2<-TK;-TP;>;
            0    7     2  parameter  TP;
            1    6     3          i  I
    Signature: <P:Ljava/lang/Object;>(Lorg/eclipse/collections/api/block/procedure/Procedure2<-TK;-TP;>;TP;)V
    MethodParameters:
           Name  Flags
      procedure  
      parameter  

  public java.util.Iterator<K> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
         0: .line 1998
            new org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView$InternalKeysViewIterator
            dup
            aload 0 /* this */
            invokespecial org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView$InternalKeysViewIterator.<init>:(Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;)V
            areturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;
    Signature: ()Ljava/util/Iterator<TK;>;

  static org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap access$0(org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap$KeysView;)Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
    flags: (0x1008) ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1961
            aload 0
            getfield org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/ObjectIntHashMap;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lorg/eclipse/collections/impl/lazy/AbstractLazyIterable<TK;>;
SourceFile: "ObjectIntHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap
InnerClasses:
  private KeysView = org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView of org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap
  public InternalKeysViewIterator = org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView$InternalKeysViewIterator of org.eclipse.collections.impl.map.mutable.primitive.ObjectIntHashMap$KeysView