Thread dependency

[nish vatsa]

I am in process of writing a program whose logic is as below

1) MAIN thread will create four child threads T1,T2,T3,T4 and will die out
2)T2 should execute(run) when T1 has finished.
3)T3 should excute(run) when T2 has finished
4)T4 should execute(run) when T3 has finished

I am nt able to implement the 2,3 and 4 condition
can anyone pls help out....
Thanks in advance

[Henry Wong]

Well, you can't really control when the run() method get called. It will be called sometime after the thread is started.

However, if you are willing to change the logic of the run() method, you can have all the threads check a shared state variable, to determine when it should perform, it part of the application.

Henry

[Paul Clapham]

If you want to just run T1, then T2, then T3, then T4, there is no point in having separate threads to do that. One thread would work just fine.

But if you really have to do that (the only reason I can think of is that it's a homework question) then

Thread t1 = new Thread(...);
t1.start();
t1.join(); // wait for t1 to finish
Thread t2 = new Thread(...);
t2.start();
t2.join();
// and so on