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

  private void <init>(org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap);
    descriptor: (Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
         0: .line 3153
            aload 0 /* this */
            aload 1
            putfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$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.DoubleObjectHashMap$KeysMapWrapper this
         0: .line 3158
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.size:()I
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;

  public boolean containsKey(double);
    descriptor: (D)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
        start local 1 // double key
         0: .line 3164
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            dload 1 /* key */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.containsKey:(D)Z
            ireturn
        end local 1 // double key
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;
            0    1     1   key  D
    MethodParameters:
      Name  Flags
      key   

  public void forEachKey(org.eclipse.collections.api.block.procedure.primitive.DoubleProcedure);
    descriptor: (Lorg/eclipse/collections/api/block/procedure/primitive/DoubleProcedure;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
        start local 1 // org.eclipse.collections.api.block.procedure.primitive.DoubleProcedure procedure
         0: .line 3170
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            aload 1 /* procedure */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.forEachKey:(Lorg/eclipse/collections/api/block/procedure/primitive/DoubleProcedure;)V
         1: .line 3171
            return
        end local 1 // org.eclipse.collections.api.block.procedure.primitive.DoubleProcedure procedure
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;
            0    2     1  procedure  Lorg/eclipse/collections/api/block/procedure/primitive/DoubleProcedure;
    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.DoubleObjectHashMap$KeysMapWrapper this
         0: .line 3176
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.isEmpty:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$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.DoubleObjectHashMap$KeysMapWrapper this
         0: .line 3182
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.notEmpty:()Z
            ireturn
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;

  public void removeKey(double);
    descriptor: (D)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
        start local 1 // double key
         0: .line 3188
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            dload 1 /* key */
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.removeKey:(D)Ljava/lang/Object;
            pop
         1: .line 3189
            return
        end local 1 // double key
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;
            0    2     1   key  D
    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.DoubleObjectHashMap$KeysMapWrapper this
         0: .line 3194
            aload 0 /* this */
            getfield org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper.this$0:Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap;
            invokevirtual org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap.clear:()V
         1: .line 3195
            return
        end local 0 // org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/eclipse/collections/impl/map/mutable/primitive/DoubleObjectHashMap$KeysMapWrapper;
}
SourceFile: "DoubleObjectHashMap.java"
NestHost: org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap
InnerClasses:
  private KeysMapWrapper = org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap$KeysMapWrapper of org.eclipse.collections.impl.map.mutable.primitive.DoubleObjectHashMap