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. 
final class com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren
  super_class: java.lang.Object
{
  final N node;
    descriptor: Ljava/lang/Object;
    flags: (0x0010) ACC_FINAL
    Signature: TN;
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  final java.util.Iterator<? extends N> childIterator;
    descriptor: Ljava/util/Iterator;
    flags: (0x0010) ACC_FINAL
    Signature: Ljava/util/Iterator<+TN;>;

  final com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator this$2;
    descriptor: Lcom/google/common/graph/Traverser$TreeTraverser$DepthFirstPostOrderIterator;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(N, java.lang.Iterable<? extends N>);
    descriptor: (Lcom/google/common/graph/Traverser$TreeTraverser$DepthFirstPostOrderIterator;Ljava/lang/Object;Ljava/lang/Iterable;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=4, args_size=4
        start local 0 // com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren this
        start local 2 // java.lang.Object node
        start local 3 // java.lang.Iterable children
         0: .line 650
            aload 0 /* this */
            aload 1
            putfield com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren.this$2:Lcom/google/common/graph/Traverser$TreeTraverser$DepthFirstPostOrderIterator;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 651
            aload 0 /* this */
            aload 2 /* node */
            putfield com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren.node:Ljava/lang/Object;
         2: .line 652
            aload 0 /* this */
            aload 3 /* children */
            invokeinterface java.lang.Iterable.iterator:()Ljava/util/Iterator;
            putfield com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren.childIterator:Ljava/util/Iterator;
         3: .line 653
            return
        end local 3 // java.lang.Iterable children
        end local 2 // java.lang.Object node
        end local 0 // com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Lcom/google/common/graph/Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren;
            0    4     2      node  TN;
            0    4     3  children  Ljava/lang/Iterable<+TN;>;
    Signature: (TN;Ljava/lang/Iterable<+TN;>;)V
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
          Name  Flags
      this$0    final
      node      
      children  
}
SourceFile: "Traverser.java"
NestHost: com.google.common.graph.Traverser
InnerClasses:
  private final TreeTraverser = com.google.common.graph.Traverser$TreeTraverser of com.google.common.graph.Traverser
  private final DepthFirstPostOrderIterator = com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator of com.google.common.graph.Traverser$TreeTraverser
  private final NodeAndChildren = com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator$NodeAndChildren of com.google.common.graph.Traverser$TreeTraverser$DepthFirstPostOrderIterator