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 interface com.google.common.collect.BiMap<K, V> extends java.util.Map<K, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.google.common.collect.BiMap
  super_class: java.lang.Object
{
  public abstract V put(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TK;TV;)TV;
    RuntimeInvisibleAnnotations: 
      com.google.errorprone.annotations.CanIgnoreReturnValue()
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
       Name  Flags
      key    
      value  

  public abstract V forcePut(K, );
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (TK;TV;)TV;
    RuntimeInvisibleAnnotations: 
      com.google.errorprone.annotations.CanIgnoreReturnValue()
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
       Name  Flags
      key    
      value  

  public abstract void putAll(java.util.Map<? extends K, ? extends V>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljava/util/Map<+TK;+TV;>;)V
    MethodParameters:
      Name  Flags
      map   

  public abstract java.util.Set<V> values();
    descriptor: ()Ljava/util/Set;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Ljava/util/Set<TV;>;

  public abstract com.google.common.collect.BiMap<V, K> inverse();
    descriptor: ()Lcom/google/common/collect/BiMap;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: ()Lcom/google/common/collect/BiMap<TV;TK;>;

  public java.util.Collection values();
    descriptor: ()Ljava/util/Collection;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokeinterface com.google.common.collect.BiMap.values:()Ljava/util/Set;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/lang/Object;Ljava/util/Map<TK;TV;>;
SourceFile: "BiMap.java"
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.GwtCompatible()