Question

I have a main function which has generated two threads for updation of JDBC SQL results. The child threads exclusively work are in infinite loop and update the results after five minutes. I want before exiting the main thread, child tread should be killed.

What is the best procedure for that?

Answer 1

So I assume your code is like this:

class ThreadTask implements Runnable {
    public void run() {
        while(true) {
            ...
        }
    }
}

What you can do is implement a flag:

class ThreadTask implements Runnable {

    private volatile boolean shouldStop = false;

    public void run() {
        while(!shouldStop) {
            ...
        }
    }

    public void stopTask() {
        shouldStop = true;
    }
}

then in the main thread:

ThreadTask task = new ThreadTask(); 
Thread t = new Thread(task);
t.start();
...
task.stopTask();
t.join();