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.escape.Escapers
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.google.common.escape.Escapers
  super_class: java.lang.Object
{
  private static final com.google.common.escape.Escaper NULL_ESCAPER;
    descriptor: Lcom/google/common/escape/Escaper;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 48
            new com.google.common.escape.Escapers$1
            dup
            invokespecial com.google.common.escape.Escapers$1.<init>:()V
         1: .line 47
            putstatic com.google.common.escape.Escapers.NULL_ESCAPER:Lcom/google/common/escape/Escaper;
         2: .line 59
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.escape.Escapers this
         0: .line 36
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.google.common.escape.Escapers this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/escape/Escapers;

  public static com.google.common.escape.Escaper nullEscaper();
    descriptor: ()Lcom/google/common/escape/Escaper;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 42
            getstatic com.google.common.escape.Escapers.NULL_ESCAPER:Lcom/google/common/escape/Escaper;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static com.google.common.escape.Escapers$Builder builder();
    descriptor: ()Lcom/google/common/escape/Escapers$Builder;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 79
            new com.google.common.escape.Escapers$Builder
            dup
            invokespecial com.google.common.escape.Escapers$Builder.<init>:()V
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  static com.google.common.escape.UnicodeEscaper asUnicodeEscaper(com.google.common.escape.Escaper);
    descriptor: (Lcom/google/common/escape/Escaper;)Lcom/google/common/escape/UnicodeEscaper;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // com.google.common.escape.Escaper escaper
         0: .line 180
            aload 0 /* escaper */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 181
            aload 0 /* escaper */
            instanceof com.google.common.escape.UnicodeEscaper
            ifeq 3
         2: .line 182
            aload 0 /* escaper */
            checkcast com.google.common.escape.UnicodeEscaper
            areturn
         3: .line 183
      StackMap locals:
      StackMap stack:
            aload 0 /* escaper */
            instanceof com.google.common.escape.CharEscaper
            ifeq 5
         4: .line 184
            aload 0 /* escaper */
            checkcast com.google.common.escape.CharEscaper
            invokestatic com.google.common.escape.Escapers.wrap:(Lcom/google/common/escape/CharEscaper;)Lcom/google/common/escape/UnicodeEscaper;
            areturn
         5: .line 188
      StackMap locals:
      StackMap stack:
            new java.lang.IllegalArgumentException
            dup
         6: .line 189
            new java.lang.StringBuilder
            dup
            ldc "Cannot create a UnicodeEscaper from: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* escaper */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         7: .line 188
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // com.google.common.escape.Escaper escaper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    8     0  escaper  Lcom/google/common/escape/Escaper;
    MethodParameters:
         Name  Flags
      escaper  

  public static java.lang.String computeReplacement(com.google.common.escape.CharEscaper, char);
    descriptor: (Lcom/google/common/escape/CharEscaper;C)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.escape.CharEscaper escaper
        start local 1 // char c
         0: .line 202
            aload 0 /* escaper */
            iload 1 /* c */
            invokevirtual com.google.common.escape.CharEscaper.escape:(C)[C
            invokestatic com.google.common.escape.Escapers.stringOrNull:([C)Ljava/lang/String;
            areturn
        end local 1 // char c
        end local 0 // com.google.common.escape.CharEscaper escaper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  escaper  Lcom/google/common/escape/CharEscaper;
            0    1     1        c  C
    MethodParameters:
         Name  Flags
      escaper  
      c        

  public static java.lang.String computeReplacement(com.google.common.escape.UnicodeEscaper, int);
    descriptor: (Lcom/google/common/escape/UnicodeEscaper;I)Ljava/lang/String;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.google.common.escape.UnicodeEscaper escaper
        start local 1 // int cp
         0: .line 215
            aload 0 /* escaper */
            iload 1 /* cp */
            invokevirtual com.google.common.escape.UnicodeEscaper.escape:(I)[C
            invokestatic com.google.common.escape.Escapers.stringOrNull:([C)Ljava/lang/String;
            areturn
        end local 1 // int cp
        end local 0 // com.google.common.escape.UnicodeEscaper escaper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  escaper  Lcom/google/common/escape/UnicodeEscaper;
            0    1     1       cp  I
    MethodParameters:
         Name  Flags
      escaper  
      cp       

  private static java.lang.String stringOrNull(char[]);
    descriptor: ([C)Ljava/lang/String;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // char[] in
         0: .line 219
            aload 0 /* in */
            ifnonnull 1
            aconst_null
            goto 2
      StackMap locals:
      StackMap stack:
         1: new java.lang.String
            dup
            aload 0 /* in */
            invokespecial java.lang.String.<init>:([C)V
      StackMap locals:
      StackMap stack: java.lang.String
         2: areturn
        end local 0 // char[] in
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0    in  [C
    MethodParameters:
      Name  Flags
      in    

  private static com.google.common.escape.UnicodeEscaper wrap(com.google.common.escape.CharEscaper);
    descriptor: (Lcom/google/common/escape/CharEscaper;)Lcom/google/common/escape/UnicodeEscaper;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.google.common.escape.CharEscaper escaper
         0: .line 224
            new com.google.common.escape.Escapers$2
            dup
            aload 0 /* escaper */
            invokespecial com.google.common.escape.Escapers$2.<init>:(Lcom/google/common/escape/CharEscaper;)V
            areturn
        end local 0 // com.google.common.escape.CharEscaper escaper
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0  escaper  Lcom/google/common/escape/CharEscaper;
    MethodParameters:
         Name  Flags
      escaper  final
}
SourceFile: "Escapers.java"
NestMembers:
  com.google.common.escape.Escapers$1  com.google.common.escape.Escapers$2  com.google.common.escape.Escapers$Builder  com.google.common.escape.Escapers$Builder$1
InnerClasses:
  com.google.common.escape.Escapers$1
  com.google.common.escape.Escapers$2
  public final Builder = com.google.common.escape.Escapers$Builder of com.google.common.escape.Escapers
    RuntimeInvisibleAnnotations: 
      com.google.common.annotations.Beta()
      com.google.common.annotations.GwtCompatible()