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.ImmutableMultiset$EntrySetSerializedForm<E> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm
  super_class: java.lang.Object
{
  final com.google.common.collect.ImmutableMultiset<E> multiset;
    descriptor: Lcom/google/common/collect/ImmutableMultiset;
    flags: (0x0010) ACC_FINAL
    Signature: Lcom/google/common/collect/ImmutableMultiset<TE;>;

  void <init>(com.google.common.collect.ImmutableMultiset<E>);
    descriptor: (Lcom/google/common/collect/ImmutableMultiset;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm this
        start local 1 // com.google.common.collect.ImmutableMultiset multiset
         0: .line 418
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 419
            aload 0 /* this */
            aload 1 /* multiset */
            putfield com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm.multiset:Lcom/google/common/collect/ImmutableMultiset;
         2: .line 420
            return
        end local 1 // com.google.common.collect.ImmutableMultiset multiset
        end local 0 // com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lcom/google/common/collect/ImmutableMultiset$EntrySetSerializedForm<TE;>;
            0    3     1  multiset  Lcom/google/common/collect/ImmutableMultiset<TE;>;
    Signature: (Lcom/google/common/collect/ImmutableMultiset<TE;>;)V
    MethodParameters:
          Name  Flags
      multiset  

  java.lang.Object readResolve();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm this
         0: .line 423
            aload 0 /* this */
            getfield com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm.multiset:Lcom/google/common/collect/ImmutableMultiset;
            invokevirtual com.google.common.collect.ImmutableMultiset.entrySet:()Lcom/google/common/collect/ImmutableSet;
            areturn
        end local 0 // com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/ImmutableMultiset$EntrySetSerializedForm<TE;>;
}
Signature: <E:Ljava/lang/Object;>Ljava/lang/Object;Ljava/io/Serializable;
SourceFile: "ImmutableMultiset.java"
NestHost: com.google.common.collect.ImmutableMultiset
InnerClasses:
  EntrySetSerializedForm = com.google.common.collect.ImmutableMultiset$EntrySetSerializedForm of com.google.common.collect.ImmutableMultiset
  public abstract Entry = com.google.common.collect.Multiset$Entry of com.google.common.collect.Multiset
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtIncompatible()