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.MapMakerInternalMap$1 implements com.google.common.collect.MapMakerInternalMap$WeakValueReference<java.lang.Object, java.lang.Object, com.google.common.collect.MapMakerInternalMap$DummyInternalEntry>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.MapMakerInternalMap$1
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$1 this
         0: .line 1002
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.collect.MapMakerInternalMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$1;

  public com.google.common.collect.MapMakerInternalMap$DummyInternalEntry getEntry();
    descriptor: ()Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$1 this
         0: .line 1005
            aconst_null
            areturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$1;

  public void clear();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$1 this
         0: .line 1009
            return
        end local 0 // com.google.common.collect.MapMakerInternalMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$1;

  public java.lang.Object get();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$1 this
         0: .line 1013
            aconst_null
            areturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$1;

  public com.google.common.collect.MapMakerInternalMap$WeakValueReference<java.lang.Object, java.lang.Object, com.google.common.collect.MapMakerInternalMap$DummyInternalEntry> copyFor(java.lang.ref.ReferenceQueue<java.lang.Object>, com.google.common.collect.MapMakerInternalMap$DummyInternalEntry);
    descriptor: (Ljava/lang/ref/ReferenceQueue;Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=3, args_size=3
        start local 0 // com.google.common.collect.MapMakerInternalMap$1 this
        start local 1 // java.lang.ref.ReferenceQueue queue
        start local 2 // com.google.common.collect.MapMakerInternalMap$DummyInternalEntry entry
         0: .line 1019
            aload 0 /* this */
            areturn
        end local 2 // com.google.common.collect.MapMakerInternalMap$DummyInternalEntry entry
        end local 1 // java.lang.ref.ReferenceQueue queue
        end local 0 // com.google.common.collect.MapMakerInternalMap$1 this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lcom/google/common/collect/MapMakerInternalMap$1;
            0    1     1  queue  Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;
            0    1     2  entry  Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;
    Signature: (Ljava/lang/ref/ReferenceQueue<Ljava/lang/Object;>;Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference<Ljava/lang/Object;Ljava/lang/Object;Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;>;
    MethodParameters:
       Name  Flags
      queue  
      entry  

  public com.google.common.collect.MapMakerInternalMap$WeakValueReference copyFor(java.lang.ref.ReferenceQueue, com.google.common.collect.MapMakerInternalMap$InternalEntry);
    descriptor: (Ljava/lang/ref/ReferenceQueue;Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.ref.ReferenceQueue
            aload 2
            checkcast com.google.common.collect.MapMakerInternalMap$DummyInternalEntry
            invokevirtual com.google.common.collect.MapMakerInternalMap$1.copyFor:(Ljava/lang/ref/ReferenceQueue;Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;)Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public com.google.common.collect.MapMakerInternalMap$InternalEntry getEntry();
    descriptor: ()Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
    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.MapMakerInternalMap$1.getEntry:()Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Lcom/google/common/collect/MapMakerInternalMap$WeakValueReference<Ljava/lang/Object;Ljava/lang/Object;Lcom/google/common/collect/MapMakerInternalMap$DummyInternalEntry;>;
SourceFile: "MapMakerInternalMap.java"
EnclosingMethod: com.google.common.collect.MapMakerInternalMap
NestHost: com.google.common.collect.MapMakerInternalMap
InnerClasses:
  com.google.common.collect.MapMakerInternalMap$1
  final DummyInternalEntry = com.google.common.collect.MapMakerInternalMap$DummyInternalEntry of com.google.common.collect.MapMakerInternalMap
  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