DeadLockDemo.java

public class DeadLockDemo { /* * This method request two locks, first String and then Integer */ public void method1() { synchronized (String.class) { System.out.println("Aquired lock on String.class object"); synchronized (Integer.class) { System.out.println("Aquired lock on Integer.class object"); } } } /* * This method also requests same two lock but in exactly * Opposite order i.e. first Integer and then String. * This creates potential deadlock, if one thread holds String lock * and other holds Integer lock and they wait for each other, forever. */ public void method2() { synchronized (Integer.class) { System.out.println("Aquired lock on Integer.class object"); synchronized (String.class) { System.out.println("Aquired lock on String.class object"); } } } }