Question

I want to create certain number of threads in my program where the number of threads to be created is provided by the user at run-time. Any suggestions ??

Answer 1

There are a number of ways to do this. A for loop is the easiest:

Thread[] threads = new Thread[numThreadsToCreate];
for (int i = 0; i < threads.length; i++) {
    threads[i] = new Thread(yourRunnable);
    threads[i].start();
}

Your Runnable could be something like this:

private class MyRunnable implements Runnable {
    public void run() {
        // your code to run in the thread goes here
    }
}

You could also use a thread-pool:

ExecutorService threadPool = Executors.newCachedThreadPool();
for (int i = 0; i < NUM_THREADS; i++) {
    threadPool.submit(yourRunnable);
}
// shutdown the pool once we submit the last job, they will continue to run
threadPool.shutdown();