public class ThreadLocked {
 public static void main(String[] args)   throws InterruptedException{
  final int[] arr = new int[10];  //the object "arr" has to be "final" because it's called inside the inner class "Thread{}"
  final int[] arr2 = new int[10]; //the object "arr2" has to be "final" because it's called inside the inner class "Thread{}"

  Thread t1 = new Thread(){
    public void run(){
      synchronized(arr){  //Locked the object "arr" as soon as we "synchronized" it.
          System.out.println("Thread 1: Locked object arr");
          try{ Thread.sleep(50);}
          catch(InterruptedException e){}
      synchronized(arr2){  //Locked the object "arr2" as soon as we "synchronized" it.
          System.out.println("Thread 1: Locked object arr2");
          }//end of synchronize the object "obj2"
      }//end of synchronized object "obj"
    }//end of run()
  };//end of thread t1.

  Thread t2 = new Thread(){
    public void run(){
      synchronized(arr2){ //Locked the object "arr2" as soon as we "synchronized" it. But
          System.out.println("Thread 2: Locked object obj");
          try{ Thread.sleep(50);}
          catch(InterruptedException e){}
      synchronized(arr){  //This will create an impass, since the object "arr" is locked by the thread t1. Thus results in deadlock!
          System.out.println("Thread 2: Locked object obj2");
          }//end of synchronize the object "obj2"
      }//end of synchronized object "obj"
    }//end of run()
  };//end of thread t2.

  t1.start();
  t2.start();
  }//end of main()
} //end of class Thread2{}