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.SortedMultisets$ElementSet<E> extends com.google.common.collect.Multisets$ElementSet<E> implements java.util.SortedSet<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.collect.SortedMultisets$ElementSet
  super_class: com.google.common.collect.Multisets$ElementSet
{
  private final com.google.common.collect.SortedMultiset<E> multiset;
    descriptor: Lcom/google/common/collect/SortedMultiset;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lcom/google/common/collect/SortedMultiset<TE;>;
    RuntimeInvisibleAnnotations: 
      com.google.j2objc.annotations.Weak()

  void <init>(com.google.common.collect.SortedMultiset<E>);
    descriptor: (Lcom/google/common/collect/SortedMultiset;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
        start local 1 // com.google.common.collect.SortedMultiset multiset
         0: .line 46
            aload 0 /* this */
            invokespecial com.google.common.collect.Multisets$ElementSet.<init>:()V
         1: .line 47
            aload 0 /* this */
            aload 1 /* multiset */
            putfield com.google.common.collect.SortedMultisets$ElementSet.multiset:Lcom/google/common/collect/SortedMultiset;
         2: .line 48
            return
        end local 1 // com.google.common.collect.SortedMultiset multiset
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
            0    3     1  multiset  Lcom/google/common/collect/SortedMultiset<TE;>;
    Signature: (Lcom/google/common/collect/SortedMultiset<TE;>;)V
    MethodParameters:
          Name  Flags
      multiset  

  final com.google.common.collect.SortedMultiset<E> multiset();
    descriptor: ()Lcom/google/common/collect/SortedMultiset;
    flags: (0x0010) ACC_FINAL
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
         0: .line 52
            aload 0 /* this */
            getfield com.google.common.collect.SortedMultisets$ElementSet.multiset:Lcom/google/common/collect/SortedMultiset;
            areturn
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
    Signature: ()Lcom/google/common/collect/SortedMultiset<TE;>;

  public java.util.Iterator<E> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
         0: .line 57
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.entrySet:()Ljava/util/Set;
            invokeinterface java.util.Set.iterator:()Ljava/util/Iterator;
            invokestatic com.google.common.collect.Multisets.elementIterator:(Ljava/util/Iterator;)Ljava/util/Iterator;
            areturn
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
    Signature: ()Ljava/util/Iterator<TE;>;

  public java.util.Comparator<? super E> comparator();
    descriptor: ()Ljava/util/Comparator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
         0: .line 62
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.comparator:()Ljava/util/Comparator;
            areturn
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
    Signature: ()Ljava/util/Comparator<-TE;>;

  public java.util.SortedSet<E> subSet(E, E);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/SortedSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=3
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
        start local 1 // java.lang.Object fromElement
        start local 2 // java.lang.Object toElement
         0: .line 67
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            aload 1 /* fromElement */
            getstatic com.google.common.collect.BoundType.CLOSED:Lcom/google/common/collect/BoundType;
            aload 2 /* toElement */
            getstatic com.google.common.collect.BoundType.OPEN:Lcom/google/common/collect/BoundType;
            invokeinterface com.google.common.collect.SortedMultiset.subMultiset:(Ljava/lang/Object;Lcom/google/common/collect/BoundType;Ljava/lang/Object;Lcom/google/common/collect/BoundType;)Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.elementSet:()Ljava/util/NavigableSet;
            areturn
        end local 2 // java.lang.Object toElement
        end local 1 // java.lang.Object fromElement
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
            0    1     1  fromElement  TE;
            0    1     2    toElement  TE;
    Signature: (TE;TE;)Ljava/util/SortedSet<TE;>;
    MethodParameters:
             Name  Flags
      fromElement  
      toElement    

  public java.util.SortedSet<E> headSet(E);
    descriptor: (Ljava/lang/Object;)Ljava/util/SortedSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
        start local 1 // java.lang.Object toElement
         0: .line 72
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            aload 1 /* toElement */
            getstatic com.google.common.collect.BoundType.OPEN:Lcom/google/common/collect/BoundType;
            invokeinterface com.google.common.collect.SortedMultiset.headMultiset:(Ljava/lang/Object;Lcom/google/common/collect/BoundType;)Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.elementSet:()Ljava/util/NavigableSet;
            areturn
        end local 1 // java.lang.Object toElement
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    1     0       this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
            0    1     1  toElement  TE;
    Signature: (TE;)Ljava/util/SortedSet<TE;>;
    MethodParameters:
           Name  Flags
      toElement  

  public java.util.SortedSet<E> tailSet(E);
    descriptor: (Ljava/lang/Object;)Ljava/util/SortedSet;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
        start local 1 // java.lang.Object fromElement
         0: .line 77
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            aload 1 /* fromElement */
            getstatic com.google.common.collect.BoundType.CLOSED:Lcom/google/common/collect/BoundType;
            invokeinterface com.google.common.collect.SortedMultiset.tailMultiset:(Ljava/lang/Object;Lcom/google/common/collect/BoundType;)Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.elementSet:()Ljava/util/NavigableSet;
            areturn
        end local 1 // java.lang.Object fromElement
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
            0    1     1  fromElement  TE;
    Signature: (TE;)Ljava/util/SortedSet<TE;>;
    MethodParameters:
             Name  Flags
      fromElement  

  public E first();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
         0: .line 82
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.firstEntry:()Lcom/google/common/collect/Multiset$Entry;
            invokestatic com.google.common.collect.SortedMultisets.getElementOrThrow:(Lcom/google/common/collect/Multiset$Entry;)Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
    Signature: ()TE;

  public E last();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.collect.SortedMultisets$ElementSet this
         0: .line 87
            aload 0 /* this */
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            invokeinterface com.google.common.collect.SortedMultiset.lastEntry:()Lcom/google/common/collect/Multiset$Entry;
            invokestatic com.google.common.collect.SortedMultisets.getElementOrThrow:(Lcom/google/common/collect/Multiset$Entry;)Ljava/lang/Object;
            areturn
        end local 0 // com.google.common.collect.SortedMultisets$ElementSet this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/collect/SortedMultisets$ElementSet<TE;>;
    Signature: ()TE;

  com.google.common.collect.Multiset multiset();
    descriptor: ()Lcom/google/common/collect/Multiset;
    flags: (0x1040) ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.google.common.collect.SortedMultisets$ElementSet.multiset:()Lcom/google/common/collect/SortedMultiset;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Lcom/google/common/collect/Multisets$ElementSet<TE;>;Ljava/util/SortedSet<TE;>;
SourceFile: "SortedMultisets.java"
NestHost: com.google.common.collect.SortedMultisets
InnerClasses:
  public abstract Entry = com.google.common.collect.Multiset$Entry of com.google.common.collect.Multiset
  abstract ElementSet = com.google.common.collect.Multisets$ElementSet of com.google.common.collect.Multisets
  ElementSet = com.google.common.collect.SortedMultisets$ElementSet of com.google.common.collect.SortedMultisets