Java 9でプロセスAPIの親プロセスを取得するにはどうすればよいですか?

<strong>Optional<ProcessHandle> parent()</strong>

import java.io.*;

public class ParentProcessTest {
   public static void main(String args[]) {
      try {
         <strong>Process </strong>notepadProcess = new <strong>ProcessBuilder</strong>("notepad.exe").start();
         <strong>ProcessHandle </strong>parentHandle = notepadProcess.<strong>toHandle()</strong>.<strong>parent()</strong>.get();
         System.out.println("Parent Process Native PID: "+ parentHandle.<strong>pid</strong>());
      } catch(IOException e) {
         e.<strong>printStackTrace()</strong>;
      }
   }
}

<strong>Parent Process Native PID : 7108</strong>