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. 
class com.google.common.collect.TreeTraverser$3 extends com.google.common.collect.FluentIterable<T>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.TreeTraverser$3
  super_class: com.google.common.collect.FluentIterable
{
  final com.google.common.collect.TreeTraverser this$0;
    descriptor: Lcom/google/common/collect/TreeTraverser;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  private final java.lang.Object val$root;
    descriptor: Ljava/lang/Object;
    flags: (0x1012) ACC_PRIVATE, ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.collect.TreeTraverser, java.lang.Object);
    descriptor: (Lcom/google/common/collect/TreeTraverser;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.google.common.collect.TreeTraverser$3 this
         0: .line 181
            aload 0 /* this */
            aload 1
            putfield com.google.common.collect.TreeTraverser$3.this$0:Lcom/google/common/collect/TreeTraverser;
            aload 0 /* this */
            aload 2
            putfield com.google.common.collect.TreeTraverser$3.val$root:Ljava/lang/Object;
            aload 0 /* this */
            invokespecial com.google.common.collect.FluentIterable.<init>:()V
            return
        end local 0 // com.google.common.collect.TreeTraverser$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/TreeTraverser$3;
    MethodParameters:
          Name  Flags
      this$0    final
      val$root  final

  public com.google.common.collect.UnmodifiableIterator<T> iterator();
    descriptor: ()Lcom/google/common/collect/UnmodifiableIterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.collect.TreeTraverser$3 this
         0: .line 184
            aload 0 /* this */
            getfield com.google.common.collect.TreeTraverser$3.this$0:Lcom/google/common/collect/TreeTraverser;
            aload 0 /* this */
            getfield com.google.common.collect.TreeTraverser$3.val$root:Ljava/lang/Object;
            invokevirtual com.google.common.collect.TreeTraverser.postOrderIterator:(Ljava/lang/Object;)Lcom/google/common/collect/UnmodifiableIterator;
            areturn
        end local 0 // com.google.common.collect.TreeTraverser$3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/TreeTraverser$3;
    Signature: ()Lcom/google/common/collect/UnmodifiableIterator<TT;>;

  public void forEach(java.util.function.Consumer<? super T>);
    descriptor: (Ljava/util/function/Consumer;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.google.common.collect.TreeTraverser$3 this
        start local 1 // java.util.function.Consumer action
         0: .line 189
            aload 1 /* action */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 190
            new com.google.common.collect.TreeTraverser$3$1
            dup
            aload 0 /* this */
            aload 1 /* action */
            invokespecial com.google.common.collect.TreeTraverser$3$1.<init>:(Lcom/google/common/collect/TreeTraverser$3;Ljava/util/function/Consumer;)V
         2: .line 196
            aload 0 /* this */
            getfield com.google.common.collect.TreeTraverser$3.val$root:Ljava/lang/Object;
            invokevirtual com.google.common.collect.TreeTraverser$3$1.accept:(Ljava/lang/Object;)V
         3: .line 197
            return
        end local 1 // java.util.function.Consumer action
        end local 0 // com.google.common.collect.TreeTraverser$3 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/google/common/collect/TreeTraverser$3;
            0    4     1  action  Ljava/util/function/Consumer<-TT;>;
    Signature: (Ljava/util/function/Consumer<-TT;>;)V
    MethodParameters:
        Name  Flags
      action  

  public java.util.Iterator iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.google.common.collect.TreeTraverser$3.iterator:()Lcom/google/common/collect/UnmodifiableIterator;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  static com.google.common.collect.TreeTraverser access$1(com.google.common.collect.TreeTraverser$3);
    descriptor: (Lcom/google/common/collect/TreeTraverser$3;)Lcom/google/common/collect/TreeTraverser;
    flags: (0x1008) ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 181
            aload 0
            getfield com.google.common.collect.TreeTraverser$3.this$0:Lcom/google/common/collect/TreeTraverser;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lcom/google/common/collect/FluentIterable<TT;>;
SourceFile: "TreeTraverser.java"
EnclosingMethod: com.google.common.collect.TreeTraverser.postOrderTraversal:(Ljava/lang/Object;)Lcom/google/common/collect/FluentIterable;
NestHost: com.google.common.collect.TreeTraverser
InnerClasses:
  com.google.common.collect.TreeTraverser$3
  com.google.common.collect.TreeTraverser$3$1