https://openjdk.java.net/ 
interface jdk.incubator.jpackage.internal.ArgAction
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.incubator.jpackage.internal.ArgAction
  super_class: java.lang.Object
{
  public abstract void execute();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "ArgAction.java"
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()