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I am creating a program wherein I have 2 threads.
Thread A performs something and sends to Thread B the result.
Thread A waits for response from Thread B before processing another task.

How can I do this?
Can anyone give me a sample code?

If you want to wait for the previous thread to finish, before you start the next, you add thread.join() in between:

for eg:-

for(int i = 0; i < 10; i++) {
    thread = new Thread(this);

    thread.join();    // Wait for it to finish.
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You have to assign your thread to a variable and later call join() on this variable like:
Thread t = new Thread() {
    public void run() {
        // other complex code

This way you will wait until the thread finishes and just then continue.
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