public class TestWaitAndNotify {
    public static void main(String[] args) {
        WaitThread t1 = new WaitThread(1, 2, 50, false);
        WaitThread t2 = new WaitThread(2, 2, 50, false);
        t1.start();
        t2.start();
    }
}

class MyLock {}

class WaitThread extends Thread {
    private static MyLock lock = new MyLock();
    private int init;
    private int delta;
    private int count;
    private boolean isLast;

    WaitThread(int init, int delta, int count, boolean isLast) {
        this.init = init;
        this.delta = delta;
        this.count = count;
        this.isLast = isLast;
    }

    @Override
    public void run() {
        for (int i = 0, num = init; i < count; i++) {
            System.out.println(num);
            num += delta;
            if (isLast && i == count - 1) return;
            synchronized (lock) {
                lock.notify();
                if (!isLast && i == count - 1) return;
                try {
                    lock.wait();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}