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.escape.Escapers$Builder$1 extends com.google.common.escape.ArrayBasedCharEscaper
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.google.common.escape.Escapers$Builder$1
  super_class: com.google.common.escape.ArrayBasedCharEscaper
{
  private final char[] replacementChars;
    descriptor: [C
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  final com.google.common.escape.Escapers$Builder this$1;
    descriptor: Lcom/google/common/escape/Escapers$Builder;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.google.common.escape.Escapers$Builder, java.util.Map, char, char);
    descriptor: (Lcom/google/common/escape/Escapers$Builder;Ljava/util/Map;CC)V
    flags: (0x0000) 
    Code:
      stack=4, locals=5, args_size=5
        start local 0 // com.google.common.escape.Escapers$Builder$1 this
        start local 2 // java.util.Map $anonymous0
        start local 3 // char $anonymous1
        start local 4 // char $anonymous2
         0: .line 153
            aload 0 /* this */
            aload 1
            putfield com.google.common.escape.Escapers$Builder$1.this$1:Lcom/google/common/escape/Escapers$Builder;
            aload 0 /* this */
            aload 2 /* $anonymous0 */
            iload 3 /* $anonymous1 */
            iload 4 /* $anonymous2 */
            invokespecial com.google.common.escape.ArrayBasedCharEscaper.<init>:(Ljava/util/Map;CC)V
         1: .line 154
            aload 0 /* this */
         2: .line 155
            aload 1
            getfield com.google.common.escape.Escapers$Builder.unsafeReplacement:Ljava/lang/String;
            ifnull 3
            aload 1
            getfield com.google.common.escape.Escapers$Builder.unsafeReplacement:Ljava/lang/String;
            invokevirtual java.lang.String.toCharArray:()[C
            goto 4
      StackMap locals: com.google.common.escape.Escapers$Builder$1 com.google.common.escape.Escapers$Builder java.util.Map int int
      StackMap stack: com.google.common.escape.Escapers$Builder$1
         3: aconst_null
      StackMap locals: com.google.common.escape.Escapers$Builder$1 com.google.common.escape.Escapers$Builder java.util.Map int int
      StackMap stack: com.google.common.escape.Escapers$Builder$1 char[]
         4: putfield com.google.common.escape.Escapers$Builder$1.replacementChars:[C
         5: .line 153
            return
        end local 4 // char $anonymous2
        end local 3 // char $anonymous1
        end local 2 // java.util.Map $anonymous0
        end local 0 // com.google.common.escape.Escapers$Builder$1 this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    6     0         this  Lcom/google/common/escape/Escapers$Builder$1;
            0    6     2  $anonymous0  Ljava/util/Map<Ljava/lang/Character;Ljava/lang/String;>;
            0    6     3  $anonymous1  C
            0    6     4  $anonymous2  C
    MethodParameters:
             Name  Flags
      this$0       final
      $anonymous0  
      $anonymous1  
      $anonymous2  

  protected char[] escapeUnsafe(char);
    descriptor: (C)[C
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.google.common.escape.Escapers$Builder$1 this
        start local 1 // char c
         0: .line 159
            aload 0 /* this */
            getfield com.google.common.escape.Escapers$Builder$1.replacementChars:[C
            areturn
        end local 1 // char c
        end local 0 // com.google.common.escape.Escapers$Builder$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/escape/Escapers$Builder$1;
            0    1     1     c  C
    MethodParameters:
      Name  Flags
      c     
}
SourceFile: "Escapers.java"
EnclosingMethod: com.google.common.escape.Escapers$Builder.build:()Lcom/google/common/escape/Escaper;
NestHost: com.google.common.escape.Escapers
InnerClasses:
  public final Builder = com.google.common.escape.Escapers$Builder of com.google.common.escape.Escapers
  com.google.common.escape.Escapers$Builder$1