https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
public abstract class com.google.common.collect.ForwardingMap$StandardEntrySet extends com.google.common.collect.Maps$EntrySet<K, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.common.collect.ForwardingMap$StandardEntrySet
  super_class: com.google.common.collect.Maps$EntrySet
{
  final com.google.common.collect.ForwardingMap this$0;
    descriptor: Lcom/google/common/collect/ForwardingMap;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  public void <init>(com.google.common.collect.ForwardingMap);
    descriptor: (Lcom/google/common/collect/ForwardingMap;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.ForwardingMap$StandardEntrySet this
         0: .line 254
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.ForwardingMap$StandardEntrySet.this$0:Lcom/google/common/collect/ForwardingMap;
            aload 0 /* this */
            invokespecial com.google.common.collect.Maps$EntrySet.<init>:()V
            return
        end local 0 // com.google.common.collect.ForwardingMap$StandardEntrySet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/ForwardingMap$StandardEntrySet;
    MethodParameters:
        Name  Flags
      this$0  final

  java.util.Map<K, V> map();
    descriptor: ()Ljava/util/Map;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.ForwardingMap$StandardEntrySet this
         0: .line 258
            aload 0 /* this */
            getfield com.google.common.collect.ForwardingMap$StandardEntrySet.this$0:Lcom/google/common/collect/ForwardingMap;
            areturn
        end local 0 // com.google.common.collect.ForwardingMap$StandardEntrySet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/ForwardingMap$StandardEntrySet;
    Signature: ()Ljava/util/Map<TK;TV;>;
}
Signature: Lcom/google/common/collect/Maps$EntrySet<TK;TV;>;
SourceFile: "ForwardingMap.java"
NestHost: com.google.common.collect.ForwardingMap
InnerClasses:
  protected abstract StandardEntrySet = com.google.common.collect.ForwardingMap$StandardEntrySet of com.google.common.collect.ForwardingMap
  abstract EntrySet = com.google.common.collect.Maps$EntrySet of com.google.common.collect.Maps
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()