Problem with multithreading in a simple java programm.

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<@&987246399047479336> please have a look, thanks.

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To make a thread (thread4) start only if at least one of the other threads (thread1, thread2, and thread3) are finished, you can use the join() method. The join() method allows one thread to wait for the completion of another thread.

Here's an example code snippet that demonstrates this concept:

public class Main {
    public static void main(String[] args) {
        Thread thread1 = new Thread(new MyRunnable());
        Thread thread2 = new Thread(new MyRunnable());
        Thread thread3 = new Thread(new MyRunnable());
        
        // Start threads 1, 2, and 3
        thread1.start();
        thread2.start();
        thread3.start();
        
        try {
            // Wait for at least one of the threads to finish
            thread1.join();
            // Start thread4 only if at least one of the threads (thread1, thread2, or thread3) is finished
            Thread thread4 = new Thread(new MyRunnable());
            thread4.start();
            
            // Wait for all remaining threads to finish
            thread2.join();
            thread3.join();
            // Wait for the newly started thread4 to finish
            thread4.join();
            
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

class MyRunnable implements Runnable {
    @Override
    public void run() {
        // Perform some task here
    }
}