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. 
abstract class com.google.common.collect.StandardTable$TableSet<T> extends com.google.common.collect.Sets$ImprovedAbstractSet<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.common.collect.StandardTable$TableSet
  super_class: com.google.common.collect.Sets$ImprovedAbstractSet
{
  final com.google.common.collect.StandardTable this$0;
    descriptor: Lcom/google/common/collect/StandardTable;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private void <init>(com.google.common.collect.StandardTable);
    descriptor: (Lcom/google/common/collect/StandardTable;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.StandardTable$TableSet this
         0: .line 205
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.StandardTable$TableSet.this$0:Lcom/google/common/collect/StandardTable;
            aload 0 /* this */
            invokespecial com.google.common.collect.Sets$ImprovedAbstractSet.<init>:()V
            return
        end local 0 // com.google.common.collect.StandardTable$TableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/StandardTable<TR;TC;TV;>.TableSet<TT;>;
    MethodParameters:
        Name  Flags
      this$0  final

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.StandardTable$TableSet this
         0: .line 208
            aload 0 /* this */
            getfield com.google.common.collect.StandardTable$TableSet.this$0:Lcom/google/common/collect/StandardTable;
            getfield com.google.common.collect.StandardTable.backingMap:Ljava/util/Map;
            invokeinterface java.util.Map.isEmpty:()Z
            ireturn
        end local 0 // com.google.common.collect.StandardTable$TableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/StandardTable<TR;TC;TV;>.TableSet<TT;>;

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.StandardTable$TableSet this
         0: .line 213
            aload 0 /* this */
            getfield com.google.common.collect.StandardTable$TableSet.this$0:Lcom/google/common/collect/StandardTable;
            getfield com.google.common.collect.StandardTable.backingMap:Ljava/util/Map;
            invokeinterface java.util.Map.clear:()V
         1: .line 214
            return
        end local 0 // com.google.common.collect.StandardTable$TableSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/collect/StandardTable<TR;TC;TV;>.TableSet<TT;>;
}
Signature: <T:Ljava/lang/Object;>Lcom/google/common/collect/Sets$ImprovedAbstractSet<TT;>;
SourceFile: "StandardTable.java"
NestHost: com.google.common.collect.StandardTable
InnerClasses:
  abstract ImprovedAbstractSet = com.google.common.collect.Sets$ImprovedAbstractSet of com.google.common.collect.Sets
  private abstract TableSet = com.google.common.collect.StandardTable$TableSet of com.google.common.collect.StandardTable