public class Test implements Runnable{
 public synchronized void get(){
  System.out.println(Thread.currentThread().getId());
  set();
 }
 public synchronized void set(){
  System.out.println(Thread.currentThread().getId());
 }
 @Override
 public void run() {
  get();
 }
 public static void main(String[] args) {
  Test ss=new Test();
  new Thread(ss).start();
  new Thread(ss).start();
  new Thread(ss).start();
 }
}