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

  public static final int IS_EMPTY;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  public static final int IS_EMPTY_MEM;
    descriptor: I
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: 2
}
SourceFile: "TargetInfo.java"