DeadlockExample.java

package com.codinginterview;

public class DeadlockExample {
 public static void main(String[] args) throws InterruptedException {
 System.out.println("Deadlock Example");
 Object obj1 = new Object();
 Object obj2 = new Object();
 Object obj3 = new Object();

 Thread t1 = new Thread(new Syncthread(obj1, obj2), "t1");
 Thread t2 = new Thread(new Syncthread(obj2, obj3), "t2");
 Thread t3 = new Thread(new Syncthread(obj3, obj1), "t3");

 t1.start();
 Thread.sleep(5000);
 t2.start();
 Thread.sleep(5000);
 t3.start();
 }

}

class Syncthread implements Runnable{

 private Object obj1;
 private Object obj2;

 public Syncthread(Object obj1, Object obj2){
 this.obj1 = obj1;
 this.obj2 = obj2;
 }

 @Override
 public void run() {

 String name = Thread.currentThread().getName();
 System.out.println(name + " acquiring lock on "+ obj1);
 synchronized (obj1){
 System.out.println(name + " acquired lock on "+ obj1);
 work();
 System.out.println(name + " acquiring lock on "+ obj2);
 synchronized (obj2){
 System.out.println(name + " acquired lock on "+ obj2);
 work();
 }
 System.out.println(name + " released lock on "+ obj2);
 }
 System.out.println(name + " releasing lock on "+ obj1);
 System.out.println(name + " finished execution.");
 }

 private void work(){
 try{
 Thread.sleep(300000);
 }catch (InterruptedException e){
 e.printStackTrace();
 }
 }
}