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. 
final class com.google.common.base.Converter$ReverseConverter<A, B> extends com.google.common.base.Converter<B, A> implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.base.Converter$ReverseConverter
  super_class: com.google.common.base.Converter
{
  final com.google.common.base.Converter<A, B> original;
    descriptor: Lcom/google/common/base/Converter;
    flags: (0x0010) ACC_FINAL
    Signature: Lcom/google/common/base/Converter<TA;TB;>;

  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 0

  void <init>(com.google.common.base.Converter<A, B>);
    descriptor: (Lcom/google/common/base/Converter;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // com.google.common.base.Converter original
         0: .line 246
            aload 0 /* this */
            invokespecial com.google.common.base.Converter.<init>:()V
         1: .line 247
            aload 0 /* this */
            aload 1 /* original */
            putfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
         2: .line 248
            return
        end local 1 // com.google.common.base.Converter original
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    3     0      this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    3     1  original  Lcom/google/common/base/Converter<TA;TB;>;
    Signature: (Lcom/google/common/base/Converter<TA;TB;>;)V
    MethodParameters:
          Name  Flags
      original  

  protected A doForward();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // java.lang.Object b
         0: .line 259
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
        end local 1 // java.lang.Object b
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    1     1     b  TB;
    Signature: (TB;)TA;
    MethodParameters:
      Name  Flags
      b     

  protected B doBackward();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // java.lang.Object a
         0: .line 264
            new java.lang.AssertionError
            dup
            invokespecial java.lang.AssertionError.<init>:()V
            athrow
        end local 1 // java.lang.Object a
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    1     1     a  TA;
    Signature: (TA;)TB;
    MethodParameters:
      Name  Flags
      a     

  A correctedDoForward();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // java.lang.Object b
         0: .line 270
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            aload 1 /* b */
            invokevirtual com.google.common.base.Converter.correctedDoBackward:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object b
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    1     1     b  TB;
    Signature: (TB;)TA;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
      Name  Flags
      b     

  B correctedDoBackward();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // java.lang.Object a
         0: .line 276
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            aload 1 /* a */
            invokevirtual com.google.common.base.Converter.correctedDoForward:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object a
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    1     1     a  TA;
    Signature: (TA;)TB;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
      METHOD_RETURN
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
      Name  Flags
      a     

  public com.google.common.base.Converter<A, B> reverse();
    descriptor: ()Lcom/google/common/base/Converter;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.base.Converter$ReverseConverter this
         0: .line 281
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            areturn
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
    Signature: ()Lcom/google/common/base/Converter<TA;TB;>;

  public boolean equals(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // com.google.common.base.Converter$ReverseConverter this
        start local 1 // java.lang.Object object
         0: .line 286
            aload 1 /* object */
            instanceof com.google.common.base.Converter$ReverseConverter
            ifeq 3
         1: .line 287
            aload 1 /* object */
            checkcast com.google.common.base.Converter$ReverseConverter
            astore 2 /* that */
        start local 2 // com.google.common.base.Converter$ReverseConverter that
         2: .line 288
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            aload 2 /* that */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            invokevirtual com.google.common.base.Converter.equals:(Ljava/lang/Object;)Z
            ireturn
        end local 2 // com.google.common.base.Converter$ReverseConverter that
         3: .line 290
      StackMap locals:
      StackMap stack:
            iconst_0
            ireturn
        end local 1 // java.lang.Object object
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    4     0    this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
            0    4     1  object  Ljava/lang/Object;
            2    3     2    that  Lcom/google/common/base/Converter$ReverseConverter<**>;
    RuntimeVisibleTypeAnnotations: 
      METHOD_FORMAL_PARAMETER
        org.checkerframework.checker.nullness.qual.Nullable()
    MethodParameters:
        Name  Flags
      object  

  public int hashCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.base.Converter$ReverseConverter this
         0: .line 295
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            invokevirtual java.lang.Object.hashCode:()I
            iconst_m1
            ixor
            ireturn
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.base.Converter$ReverseConverter this
         0: .line 300
            new java.lang.StringBuilder
            dup
            invokespecial java.lang.StringBuilder.<init>:()V
            aload 0 /* this */
            getfield com.google.common.base.Converter$ReverseConverter.original:Lcom/google/common/base/Converter;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc ".reverse()"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.google.common.base.Converter$ReverseConverter this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/base/Converter$ReverseConverter<TA;TB;>;
}
Signature: <A:Ljava/lang/Object;B:Ljava/lang/Object;>Lcom/google/common/base/Converter<TB;TA;>;Ljava/io/Serializable;
SourceFile: "Converter.java"
NestHost: com.google.common.base.Converter
InnerClasses:
  private final ReverseConverter = com.google.common.base.Converter$ReverseConverter of com.google.common.base.Converter