Something

import java.io.IOException;

public class Pid {
public static void main(String[] args) throws IOException {
  byte[] bo = new byte[100];
  String[] cmd = {"bash", "-c", "echo $PPID"};
  Process p = Runtime.getRuntime().exec(cmd);
  p.getInputStream().read(bo);
  System.out.println(new String(bo));
}
}