This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
i want the 3rd thread and 2nd thread to join the first thread.
Right now your main thread will wait for the 1st thread to join i.e. the run method completes.
If you want the 3rd and 2nd thread to join the 1st thread, then you'll have to call join on t2 and t3 in the 1st thread not in the main method. You need to understand the use of join method properly. When you call join on an instance of a Thread class, the method call returns i.e. the method call ends when the thread on which the join method was called ends i.e. the run method completes. So if in thread A1 you call join on thread A2, then A1 will continue execution when A2 thread completes...