class Callme 
{
		synchronized void call(String msg) 
		{
				System.out.print( msg 
+ " ");
			try 
			{
				Thread.sleep(1000);
			} 
			catch(InterruptedException e) 
			{
				System.out.println
("Interrupted");
			}
			
		}
}
class Caller implements Runnable 
{
		String msg;
		Callme target;
		Thread t;
		public Caller(Callme targ, String s) 
			{
				target = targ;
				msg = s;
				t = new Thread(this);
				t.start();
			}
		public void run() 
			{
				target.call(msg);
			}
}
class Synch 
{
	public static void main(String args[]) 
		{
			Callme target = new Callme();
			Caller ob1 = new Caller
(target, "Hello");
			Caller ob2 = new Caller
(target, "How are you");
// wait for threads to end
			try 
			{
				ob1.t.join();
				
				ob2.t.join();
			}
			catch(InterruptedException e) 
			{
				System.out.println
("Interrupted");
			}
		}
}


The above program will print Hello how are you with two 
diff thread