https://openjdk.java.net/ 
public interface jdk.nashorn.internal.runtime.regexp.joni.constants.Traverse
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.nashorn.internal.runtime.regexp.joni.constants.Traverse
  super_class: java.lang.Object
{
  public static final int TRAVERSE_CALLBACK_AT_FIRST;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int TRAVERSE_CALLBACK_AT_LAST;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2

  public static final int TRAVERSE_CALLBACK_AT_BOTH;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 3
}
SourceFile: "Traverse.java"