Prakash Chandra Hazari

When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block until the first thread is done with the object.i.e at a time one thread can access shared variable. please refer following code example: class disp { void display(String nm) { System.out.print("Mr "); try{Thread.sleep(2000);}catch(Exception e){} System.out.print(nm); System.out.println(" Das"); } } class syn implements Runnable { disp ob; String s; syn(disp ob1,String s1) { ob=ob1;s=s1; Thread t=new Thread(this); t.start(); } public void run() { synchronized(ob) { ob.display(s); } } } class synmain { public static void main(String ars[]) { disp ob=new disp(); new syn(ob,"ram"); new syn(ob,"shyam"); new syn(ob,"Hari"); new syn(ob,"jadu"); new syn(ob,"Madhu"); } }