package lista5nowa;

class Watek extends Thread {
    int id;

    public Watek(int id) {
        this.id = id;
    }

    public void run() {
        // System.out.println("Watek " + id);
        System.out.println(this.getName());
        try {
            sleep(1000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

public class zad {

    public static void main(String[] args) {

        final int N = 20;

        Watek[] threads = new Watek[N];
        for (int i = 0; i < N; i++) {
            threads[i] = new Watek(i);

        }
        int i;
        for (i = 0; i < N; i++) {
            if (i % 2 == 0) {
                threads[i].start();
                try {
                    threads[i].join();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        for (i = 0; i < N; i++) {
            if (i % 2 != 0) {
                threads[i].start();
                try {
                    threads[i].join();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

}