https://www.graalvm.org/ 
public interface com.oracle.truffle.regex.tregex.string.AbstractStringBuffer
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.regex.tregex.string.AbstractStringBuffer
  super_class: java.lang.Object
{
  public abstract com.oracle.truffle.regex.tregex.string.Encodings$Encoding getEncoding();
    descriptor: ()Lcom/oracle/truffle/regex/tregex/string/Encodings$Encoding;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract void append(int);
    descriptor: (I)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
           Name  Flags
      codepoint  

  public abstract void appendOR(int, int);
    descriptor: (II)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      c1    
      c2    

  public abstract void appendXOR(int, int);
    descriptor: (II)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      c1    
      c2    

  public abstract void clear();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT

  public abstract com.oracle.truffle.regex.tregex.string.AbstractString materialize();
    descriptor: ()Lcom/oracle/truffle/regex/tregex/string/AbstractString;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "AbstractStringBuffer.java"
InnerClasses:
  public abstract Encoding = com.oracle.truffle.regex.tregex.string.Encodings$Encoding of com.oracle.truffle.regex.tregex.string.Encodings