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.graph.DirectedMultiNetworkConnections$1 extends com.google.common.graph.MultiEdgesConnecting<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.graph.DirectedMultiNetworkConnections$1
  super_class: com.google.common.graph.MultiEdgesConnecting
{
  final com.google.common.graph.DirectedMultiNetworkConnections this$0;
    descriptor: Lcom/google/common/graph/DirectedMultiNetworkConnections;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

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

  void <init>(com.google.common.graph.DirectedMultiNetworkConnections, java.util.Map, java.lang.Object, java.lang.Object);
    descriptor: (Lcom/google/common/graph/DirectedMultiNetworkConnections;Ljava/util/Map;Ljava/lang/Object;Ljava/lang/Object;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=5, args_size=5
        start local 0 // com.google.common.graph.DirectedMultiNetworkConnections$1 this
        start local 2 // java.util.Map $anonymous0
        start local 3 // java.lang.Object $anonymous1
         0: .line 96
            aload 0 /* this */
            aload 1
            putfield com.google.common.graph.DirectedMultiNetworkConnections$1.this$0:Lcom/google/common/graph/DirectedMultiNetworkConnections;
            aload 0 /* this */
            aload 4
            putfield com.google.common.graph.DirectedMultiNetworkConnections$1.val$node:Ljava/lang/Object;
            aload 0 /* this */
            aload 2 /* $anonymous0 */
            aload 3 /* $anonymous1 */
            invokespecial com.google.common.graph.MultiEdgesConnecting.<init>:(Ljava/util/Map;Ljava/lang/Object;)V
            return
        end local 3 // java.lang.Object $anonymous1
        end local 2 // java.util.Map $anonymous0
        end local 0 // com.google.common.graph.DirectedMultiNetworkConnections$1 this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Lcom/google/common/graph/DirectedMultiNetworkConnections$1;
            0    1     2  $anonymous0  Ljava/util/Map<TE;*>;
            0    1     3  $anonymous1  Ljava/lang/Object;
    MethodParameters:
             Name  Flags
      this$0       final
      $anonymous0  
      $anonymous1  
      val$node     final

  public int size();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.graph.DirectedMultiNetworkConnections$1 this
         0: .line 99
            aload 0 /* this */
            getfield com.google.common.graph.DirectedMultiNetworkConnections$1.this$0:Lcom/google/common/graph/DirectedMultiNetworkConnections;
            invokevirtual com.google.common.graph.DirectedMultiNetworkConnections.successorsMultiset:()Lcom/google/common/collect/Multiset;
            aload 0 /* this */
            getfield com.google.common.graph.DirectedMultiNetworkConnections$1.val$node:Ljava/lang/Object;
            invokeinterface com.google.common.collect.Multiset.count:(Ljava/lang/Object;)I
            ireturn
        end local 0 // com.google.common.graph.DirectedMultiNetworkConnections$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/graph/DirectedMultiNetworkConnections$1;
}
Signature: Lcom/google/common/graph/MultiEdgesConnecting<TE;>;
SourceFile: "DirectedMultiNetworkConnections.java"
EnclosingMethod: com.google.common.graph.DirectedMultiNetworkConnections.edgesConnecting:(Ljava/lang/Object;)Ljava/util/Set;
NestHost: com.google.common.graph.DirectedMultiNetworkConnections
InnerClasses:
  com.google.common.graph.DirectedMultiNetworkConnections$1