import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.BrokenBarrierException;

class Test {
    static final int NUM_THREADS = 5;
    public static void main(String[] args) {
        CountDownLatch cdl = new CountDownLatch(NUM_THREADS);
        CyclicBarrier cb = new CyclicBarrier(NUM_THREADS + 1);
        // Thread[] traader = new Thread[NUM_THREADS];
        // for (int i = 0; i < NUM_THREADS; i++) {
        //     traader[i] = new Thread(new Task());
        //     traader[i].start();
        // }
        // try {
        //     for (Thread traad : traader) {
        //         traad.join();
        //     }
        // } catch (InterruptedException e) {}

        for (int i = 0; i < NUM_THREADS; i++) {
            new Thread(new Task(cdl, cb)).start();
        }
        try {
            cb.await();
        } catch (InterruptedException | BrokenBarrierException e) {}

        System.out.println("Alle traadene er ferdig");
    }
}

class Task implements Runnable {
    static int idLager = 0;
    int id;
    Random r = new Random();
    CountDownLatch cdl;
    CyclicBarrier cb;

    public Task(CountDownLatch cdl, CyclicBarrier cb) {
        this.cdl = cdl;
        this.cb = cb;
        id = idLager++;
    }

    public void run() {
        System.out.println("Starter traad nr " + id);
        try {
            Thread.sleep(r.nextInt(5000));
        } catch (InterruptedException e) {
            System.out.println("Ble avbrutt");
        }
        System.out.printf("Traad nr %d er ferdig\n", id);
        // cdl.countDown();
        try {
            cb.await();
        } catch (InterruptedException | BrokenBarrierException e) {}
        System.out.println("yaaay");
    }
}