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. 
public final class com.google.common.collect.HashMultiset<E> extends com.google.common.collect.AbstractMapBasedMultiset<E>
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.google.common.collect.HashMultiset
  super_class: com.google.common.collect.AbstractMapBasedMultiset
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 0
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtIncompatible()

  public static <E> com.google.common.collect.HashMultiset<E> create();
    descriptor: ()Lcom/google/common/collect/HashMultiset;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 38
            new com.google.common.collect.HashMultiset
            dup
            invokespecial com.google.common.collect.HashMultiset.<init>:()V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Signature: <E:Ljava/lang/Object;>()Lcom/google/common/collect/HashMultiset<TE;>;

  public static <E> com.google.common.collect.HashMultiset<E> create(int);
    descriptor: (I)Lcom/google/common/collect/HashMultiset;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // int distinctElements
         0: .line 49
            new com.google.common.collect.HashMultiset
            dup
            iload 0 /* distinctElements */
            invokespecial com.google.common.collect.HashMultiset.<init>:(I)V
            areturn
        end local 0 // int distinctElements
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0  distinctElements  I
    Signature: <E:Ljava/lang/Object;>(I)Lcom/google/common/collect/HashMultiset<TE;>;
    MethodParameters:
                  Name  Flags
      distinctElements  

  public static <E> com.google.common.collect.HashMultiset<E> create(java.lang.Iterable<? extends E>);
    descriptor: (Ljava/lang/Iterable;)Lcom/google/common/collect/HashMultiset;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // java.lang.Iterable elements
         0: .line 60
            aload 0 /* elements */
            invokestatic com.google.common.collect.Multisets.inferDistinctElements:(Ljava/lang/Iterable;)I
            invokestatic com.google.common.collect.HashMultiset.create:(I)Lcom/google/common/collect/HashMultiset;
            astore 1 /* multiset */
        start local 1 // com.google.common.collect.HashMultiset multiset
         1: .line 61
            aload 1 /* multiset */
            aload 0 /* elements */
            invokestatic com.google.common.collect.Iterables.addAll:(Ljava/util/Collection;Ljava/lang/Iterable;)Z
            pop
         2: .line 62
            aload 1 /* multiset */
            areturn
        end local 1 // com.google.common.collect.HashMultiset multiset
        end local 0 // java.lang.Iterable elements
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0  elements  Ljava/lang/Iterable<+TE;>;
            1    3     1  multiset  Lcom/google/common/collect/HashMultiset<TE;>;
    Signature: <E:Ljava/lang/Object;>(Ljava/lang/Iterable<+TE;>;)Lcom/google/common/collect/HashMultiset<TE;>;
    MethodParameters:
          Name  Flags
      elements  

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.collect.HashMultiset this
         0: .line 66
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.<init>:(Ljava/util/Map;)V
         1: .line 67
            return
        end local 0 // com.google.common.collect.HashMultiset this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/collect/HashMultiset<TE;>;

  private void <init>(int);
    descriptor: (I)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.HashMultiset this
        start local 1 // int distinctElements
         0: .line 70
            aload 0 /* this */
            iload 1 /* distinctElements */
            invokestatic com.google.common.collect.Maps.newHashMapWithExpectedSize:(I)Ljava/util/HashMap;
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.<init>:(Ljava/util/Map;)V
         1: .line 71
            return
        end local 1 // int distinctElements
        end local 0 // com.google.common.collect.HashMultiset this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    2     0              this  Lcom/google/common/collect/HashMultiset<TE;>;
            0    2     1  distinctElements  I
    MethodParameters:
                  Name  Flags
      distinctElements  

  private void writeObject(java.io.ObjectOutputStream);
    descriptor: (Ljava/io/ObjectOutputStream;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.collect.HashMultiset this
        start local 1 // java.io.ObjectOutputStream stream
         0: .line 79
            aload 1 /* stream */
            invokevirtual java.io.ObjectOutputStream.defaultWriteObject:()V
         1: .line 80
            aload 0 /* this */
            aload 1 /* stream */
            invokestatic com.google.common.collect.Serialization.writeMultiset:(Lcom/google/common/collect/Multiset;Ljava/io/ObjectOutputStream;)V
         2: .line 81
            return
        end local 1 // java.io.ObjectOutputStream stream
        end local 0 // com.google.common.collect.HashMultiset this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/google/common/collect/HashMultiset<TE;>;
            0    3     1  stream  Ljava/io/ObjectOutputStream;
    Exceptions:
      throws java.io.IOException
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtIncompatible()
    MethodParameters:
        Name  Flags
      stream  

  private void readObject(java.io.ObjectInputStream);
    descriptor: (Ljava/io/ObjectInputStream;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // com.google.common.collect.HashMultiset this
        start local 1 // java.io.ObjectInputStream stream
         0: .line 85
            aload 1 /* stream */
            invokevirtual java.io.ObjectInputStream.defaultReadObject:()V
         1: .line 86
            aload 1 /* stream */
            invokestatic com.google.common.collect.Serialization.readCount:(Ljava/io/ObjectInputStream;)I
            istore 2 /* distinctElements */
        start local 2 // int distinctElements
         2: .line 87
            aload 0 /* this */
            invokestatic com.google.common.collect.Maps.newHashMap:()Ljava/util/HashMap;
            invokevirtual com.google.common.collect.HashMultiset.setBackingMap:(Ljava/util/Map;)V
         3: .line 88
            aload 0 /* this */
            aload 1 /* stream */
            iload 2 /* distinctElements */
            invokestatic com.google.common.collect.Serialization.populateMultiset:(Lcom/google/common/collect/Multiset;Ljava/io/ObjectInputStream;I)V
         4: .line 89
            return
        end local 2 // int distinctElements
        end local 1 // java.io.ObjectInputStream stream
        end local 0 // com.google.common.collect.HashMultiset this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    5     0              this  Lcom/google/common/collect/HashMultiset<TE;>;
            0    5     1            stream  Ljava/io/ObjectInputStream;
            2    5     2  distinctElements  I
    Exceptions:
      throws java.io.IOException, java.lang.ClassNotFoundException
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtIncompatible()
    MethodParameters:
        Name  Flags
      stream  

  public void forEachEntry(java.util.function.ObjIntConsumer);
    descriptor: (Ljava/util/function/ObjIntConsumer;)V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.forEachEntry:(Ljava/util/function/ObjIntConsumer;)V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public boolean contains(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.contains:(Ljava/lang/Object;)Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void clear();
    descriptor: ()V
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.clear:()V
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Set entrySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.entrySet:()Ljava/util/Set;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Iterator iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.iterator:()Ljava/util/Iterator;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public java.util.Set elementSet();
    descriptor: ()Ljava/util/Set;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.elementSet:()Ljava/util/Set;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public int setCount(java.lang.Object, int);
    descriptor: (Ljava/lang/Object;I)I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            iload 2
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.setCount:(Ljava/lang/Object;I)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public boolean setCount(java.lang.Object, int, int);
    descriptor: (Ljava/lang/Object;II)Z
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=4, locals=4, args_size=4
         0: .line 1
            aload 0
            aload 1
            iload 2
            iload 3
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.setCount:(Ljava/lang/Object;II)Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public boolean isEmpty();
    descriptor: ()Z
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.isEmpty:()Z
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public int count(java.lang.Object);
    descriptor: (Ljava/lang/Object;)I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.count:(Ljava/lang/Object;)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public int remove(java.lang.Object, int);
    descriptor: (Ljava/lang/Object;I)I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            iload 2
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.remove:(Ljava/lang/Object;I)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public int add(java.lang.Object, int);
    descriptor: (Ljava/lang/Object;I)I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            iload 2
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.add:(Ljava/lang/Object;I)I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public int size();
    descriptor: ()I
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokespecial com.google.common.collect.AbstractMapBasedMultiset.size:()I
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <E:Ljava/lang/Object;>Lcom/google/common/collect/AbstractMapBasedMultiset<TE;>;
SourceFile: "HashMultiset.java"
InnerClasses:
  public abstract Entry = com.google.common.collect.Multiset$Entry of com.google.common.collect.Multiset
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible(serializable = true, emulated = true)