Synchronized

class Dcoder{
 public static void main(String[] args){
  Resource resource = new Resource();
  for(int i = 1; i < 3; i++){
   Thread thread = new Thread(new SubThread(resource));
   thread.setName("Thread: " + i);
   thread.start();
}
}
}
class SubThread implements Runnable{
 Resource res;
 SubThread(Resource res){
  this.res = res;
}
 public void run(){
  synchronized (res){
  res.x = 1;
 for(int i = 1; i < 3; i++){
  System.out.printf("%s %d \n", Thread.currentThread().getName(), res.x);
  res.x++;
  try{
   Thread.sleep(100);
}
  catch(InterruptedException ex){
   ex.printStackTrace();
}
}
}
}
}
class Resource{
 int x = 0;
}

class Dcoder{
 public static void main(String[] args){
  Resource res1 = new Resource();
  for(int i = 1; i < 3; i++){
   Thread thread = new Thread(new SubThread(res1));
   thread.setName("Thread: " + i);
   thread.start();
}
}
}
class SubThread implements Runnable{
 Resource res2;
 SubThread(Resource res1){
  res2 = res1;
}
 public void run(){
  synchronized(res2){
  res2.x = 1;
 for(int i = 1; i < 3; i++){
  System.out.printf("%s %d \n", Thread.currentThread().getName(), res2.x);
  res2.x++;
  try{
   Thread.sleep(100);
}
  catch(InterruptedException ex){
   ex.printStackTrace();
}
}
}
}
}
class Resource{
 int x;
}