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.collect.MapMakerInternalMap$WeakValueReferenceImpl<K, V, E extends com.google.common.collect.MapMakerInternalMap$InternalEntry<K, V, E>> extends java.lang.ref.WeakReference<V> implements com.google.common.collect.MapMakerInternalMap$WeakValueReference<K, V, E>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl
  super_class: java.lang.ref.WeakReference
{
  final E entry;
    descriptor: Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
    flags: (0x0010) ACC_FINAL
    Signature: TE;
    RuntimeInvisibleAnnotations: 
      com.google.j2objc.annotations.Weak()

  void <init>(java.lang.ref.ReferenceQueue<V>, V, );
    descriptor: (Ljava/lang/ref/ReferenceQueue;Ljava/lang/Object;Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
        start local 1 // java.lang.ref.ReferenceQueue queue
        start local 2 // java.lang.Object referent
        start local 3 // com.google.common.collect.MapMakerInternalMap$InternalEntry entry
         0: .line 1028
            aload 0 /* this */
            aload 2 /* referent */
            aload 1 /* queue */
            invokespecial java.lang.ref.WeakReference.<init>:(Ljava/lang/Object;Ljava/lang/ref/ReferenceQueue;)V
         1: .line 1029
            aload 0 /* this */
            aload 3 /* entry */
            putfield com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl.entry:Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
         2: .line 1030
            return
        end local 3 // com.google.common.collect.MapMakerInternalMap$InternalEntry entry
        end local 2 // java.lang.Object referent
        end local 1 // java.lang.ref.ReferenceQueue queue
        end local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lcom/google/common/collect/MapMakerInternalMap$WeakValueReferenceImpl<TK;TV;TE;>;
            0    3     1     queue  Ljava/lang/ref/ReferenceQueue<TV;>;
            0    3     2  referent  TV;
            0    3     3     entry  TE;
    Signature: (Ljava/lang/ref/ReferenceQueue<TV;>;TV;TE;)V
    MethodParameters:
          Name  Flags
      queue     
      referent  
      entry     

  public E getEntry();
    descriptor: ()Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
         0: .line 1034
            aload 0 /* this */
            getfield com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl.entry:Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
            areturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$WeakValueReferenceImpl<TK;TV;TE;>;
    Signature: ()TE;

  public com.google.common.collect.MapMakerInternalMap$WeakValueReference<K, V, E> copyFor(java.lang.ref.ReferenceQueue<V>, E);
    descriptor: (Ljava/lang/ref/ReferenceQueue;Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
        start local 1 // java.lang.ref.ReferenceQueue queue
        start local 2 // com.google.common.collect.MapMakerInternalMap$InternalEntry entry
         0: .line 1039
            new com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl
            dup
            aload 1 /* queue */
            aload 0 /* this */
            invokevirtual com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl.get:()Ljava/lang/Object;
            aload 2 /* entry */
            invokespecial com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl.<init>:(Ljava/lang/ref/ReferenceQueue;Ljava/lang/Object;Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;)V
            areturn
        end local 2 // com.google.common.collect.MapMakerInternalMap$InternalEntry entry
        end local 1 // java.lang.ref.ReferenceQueue queue
        end local 0 // com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/google/common/collect/MapMakerInternalMap$WeakValueReferenceImpl<TK;TV;TE;>;
            0    1     1  queue  Ljava/lang/ref/ReferenceQueue<TV;>;
            0    1     2  entry  TE;
    Signature: (Ljava/lang/ref/ReferenceQueue<TV;>;TE;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference<TK;TV;TE;>;
    MethodParameters:
       Name  Flags
      queue  
      entry  
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;E::Lcom/google/common/collect/MapMakerInternalMap$InternalEntry<TK;TV;TE;>;>Ljava/lang/ref/WeakReference<TV;>;Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference<TK;TV;TE;>;
SourceFile: "MapMakerInternalMap.java"
NestHost: com.google.common.collect.MapMakerInternalMap
InnerClasses:
  abstract InternalEntry = com.google.common.collect.MapMakerInternalMap$InternalEntry of com.google.common.collect.MapMakerInternalMap
  abstract WeakValueReference = com.google.common.collect.MapMakerInternalMap$WeakValueReference of com.google.common.collect.MapMakerInternalMap
  final WeakValueReferenceImpl = com.google.common.collect.MapMakerInternalMap$WeakValueReferenceImpl of com.google.common.collect.MapMakerInternalMap