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.IntObjectHashMap$KeysMapWrapper implements org.eclipse.collections.impl.map.mutable.primitive.MutableIntKeysMap
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper
  super_class: java.lang.Object
{
  final org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap this$0;
    descriptor: Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private void <init>(org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
         0: .line 3155
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;
    MethodParameters:
        Name  Flags
      this$0  final

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
         0: .line 3160
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.size:()I
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;

  public boolean containsKey(int);
    descriptor: (I)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
        start local 1 // int key
         0: .line 3166
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            iload 1 /* key */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.containsKey:(I)Z
            ireturn
        end local 1 // int key
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;
            0    1     1   key  I
    MethodParameters:
      Name  Flags
      key   

  public void forEachKey(org.eclipse.collections.api.block.procedure.primitive.IntProcedure);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/primitive/IntProcedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
        start local 1 // org.eclipse.collections.api.block.procedure.primitive.IntProcedure procedure
         0: .line 3172
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            aload 1 /* procedure */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.forEachKey:(Lorg/eclipse/collections/api/block/procedure/primitive/IntProcedure;)V
         1: .line 3173
            return
        end local 1 // org.eclipse.collections.api.block.procedure.primitive.IntProcedure procedure
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;
            0    2     1  procedure  Lorg/eclipse/collections/api/block/procedure/primitive/IntProcedure;
    MethodParameters:
           Name  Flags
      procedure  

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
         0: .line 3178
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.isEmpty:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;

  public boolean notEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
         0: .line 3184
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.notEmpty:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;

  public void removeKey(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
        start local 1 // int key
         0: .line 3190
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            iload 1 /* key */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.removeKey:(I)Ljava/lang/Object;
            pop
         1: .line 3191
            return
        end local 1 // int key
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;
            0    2     1   key  I
    MethodParameters:
      Name  Flags
      key   

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
         0: .line 3196
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap.clear:()V
         1: .line 3197
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/IntObjectHashMap$KeysMapWrapper;
}
SourceFile: "IntObjectHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap
InnerClasses:
  private KeysMapWrapper = org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap$KeysMapWrapper of org.eclipse.collections.impl.map.mutable.primitive.IntObjectHashMap