public class NonSynchronized { public static void main(String args[]) { MsgSender sender = new MsgSender(); Caller c1,c2,c3; c1 = new Caller("Hello", sender); c2 = new Caller("World", sender); c3 = new Caller("Syncronized", sender); Thread t1 = new Thread(c1); Thread t2 = new Thread(c2); Thread t3 = new Thread(c3); t1.start(); t2.start(); t3.start(); try { t1.join(); t2.join(); t3.join(); } catch(InterruptedException ie) { } } } class MsgSender{ void sendMsg(String msg) { System.out.print(" [ " + msg ); System.out.print(" ] "); } } class Caller implements Runnable{ String msg; MsgSender sender; public Caller(String msg ,MsgSender sender) { this.msg = msg; this.sender = sender; } public void run() { sender.sendMsg(msg); } } Question: I want to print how is the road [Hello] [synchronous] [world] or [Hello] [World] [Synchronous] Where [must be before the word and] must be after the word. Regardless of word order. You can use either, Block, or Lock..Semaphore or Syncronized methods.