java - Program not resulting in deadlock -

i trying achieve deadlock condition in program program not giving deadlock condition .why? please tell me problem in code.

the output :

thread1 : locked integer
thread2 : locked string
thread1 : locked string
thread2 : locked integer

code:

 class dead {     public void meth1() {         synchronized (integer.class) {             system.out.println("thread 1: locked integer");         }         try {             thread.sleep(5000);         } catch (interruptedexception e) {             system.out.println(e);         }         synchronized (string.class) {             system.out.println("thread 1: locked string");         }     }      public void meth2() {         synchronized (string.class) {             system.out.println("thread 2: locked string");         }         try {             thread.sleep(5000);         } catch (interruptedexception e) {             system.out.println(e);         }         synchronized (integer.class) {             system.out.println("thread 2: locked integer");          }     }  }  class mthread1 extends thread {     dead d;      mthread1(dead d) {         this.d = d;     }      public void run() {         d.meth1();     }  }  class mthread2 extends thread {      dead d;      mthread2(dead d) {         this.d = d;     }      public void run() {         d.meth2();     }  }  public class thread1 {     public static void main(string[] args) {         // dead d = new dead();         mthread1 t1 = new mthread1(new dead());         mthread2 t2 = new mthread2(new dead());         t1.start();         t2.start();     } } 

when write

synchronized (integer.class) {             system.out.println("thread 1: locked integer");         } 

it locks integer.class object , unlocks it. want this:

synchronized(integer.class) {     system.out.println("thread 1: locked integer");     try {         thread.sleep(5000);     } catch(interruptedexception e) {         system.out.println(e);     }     synchronized(string.class) {         system.out.println("thread 1: locked string");     } }