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");
            }
        }
    }
}