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. 
abstract class com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry<K, V, E extends com.google.common.collect.MapMakerInternalMap$InternalEntry<K, V, E>> extends java.lang.ref.WeakReference<K> implements com.google.common.collect.MapMakerInternalMap$InternalEntry<K, V, E>
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry
  super_class: java.lang.ref.WeakReference
{
  final int hash;
    descriptor: I
    flags: (0x0010) ACC_FINAL

  final E next;
    descriptor: Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
    flags: (0x0010) ACC_FINAL
    Signature: TE;
    RuntimeVisibleTypeAnnotations: 
      FIELD
        org.checkerframework.checker.nullness.qual.Nullable()

  void <init>(java.lang.ref.ReferenceQueue<K>, K, int, );
    descriptor: (Ljava/lang/ref/ReferenceQueue;Ljava/lang/Object;ILcom/google/common/collect/MapMakerInternalMap$InternalEntry;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=5, args_size=5
        start local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
        start local 1 // java.lang.ref.ReferenceQueue queue
        start local 2 // java.lang.Object key
        start local 3 // int hash
        start local 4 // com.google.common.collect.MapMakerInternalMap$InternalEntry next
         0: .line 652
            aload 0 /* this */
            aload 2 /* key */
            aload 1 /* queue */
            invokespecial java.lang.ref.WeakReference.<init>:(Ljava/lang/Object;Ljava/lang/ref/ReferenceQueue;)V
         1: .line 653
            aload 0 /* this */
            iload 3 /* hash */
            putfield com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry.hash:I
         2: .line 654
            aload 0 /* this */
            aload 4 /* next */
            putfield com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry.next:Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
         3: .line 655
            return
        end local 4 // com.google.common.collect.MapMakerInternalMap$InternalEntry next
        end local 3 // int hash
        end local 2 // java.lang.Object key
        end local 1 // java.lang.ref.ReferenceQueue queue
        end local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    4     0   this  Lcom/google/common/collect/MapMakerInternalMap$AbstractWeakKeyEntry<TK;TV;TE;>;
            0    4     1  queue  Ljava/lang/ref/ReferenceQueue<TK;>;
            0    4     2    key  TK;
            0    4     3   hash  I
            0    4     4   next  TE;
    Signature: (Ljava/lang/ref/ReferenceQueue<TK;>;TK;ITE;)V
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
       Name  Flags
      queue  
      key    
      hash   
      next   

  public K getKey();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
         0: .line 659
            aload 0 /* this */
            invokevirtual com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry.get:()Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$AbstractWeakKeyEntry<TK;TV;TE;>;
    Signature: ()TK;

  public int getHash();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
         0: .line 664
            aload 0 /* this */
            getfield com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry.hash:I
            ireturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$AbstractWeakKeyEntry<TK;TV;TE;>;

  public E getNext();
    descriptor: ()Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
         0: .line 669
            aload 0 /* this */
            getfield com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry.next:Lcom/google/common/collect/MapMakerInternalMap$InternalEntry;
            areturn
        end local 0 // com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/MapMakerInternalMap$AbstractWeakKeyEntry<TK;TV;TE;>;
    Signature: ()TE;
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;E::Lcom/google/common/collect/MapMakerInternalMap$InternalEntry<TK;TV;TE;>;>Ljava/lang/ref/WeakReference<TK;>;Lcom/google/common/collect/MapMakerInternalMap$InternalEntry<TK;TV;TE;>;
SourceFile: "MapMakerInternalMap.java"
NestHost: com.google.common.collect.MapMakerInternalMap
InnerClasses:
  abstract AbstractWeakKeyEntry = com.google.common.collect.MapMakerInternalMap$AbstractWeakKeyEntry of com.google.common.collect.MapMakerInternalMap
  abstract InternalEntry = com.google.common.collect.MapMakerInternalMap$InternalEntry of com.google.common.collect.MapMakerInternalMap