public class ThreadTest2 {
    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();

    public void conditionWait() throws InterruptedException {
        lock.lock();
        try {
            System.out.println("1");
            condition.await();
            System.out.println("2");
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void conditionSignal() throws InterruptedException {
        lock.lock();
        try {
            System.out.println("3");
            condition.signal();
            System.out.println("4");
        } finally {
            lock.unlock();
        }
    }

    public static void main(String[] args) throws InterruptedException {
        ThreadTest2 test = new ThreadTest2();

        test.conditionWait();

        Thread.sleep(2000);

        test.conditionSignal();
    }
}

public class ThreadTest2 {
    Lock lock = new ReentrantLock();
    Condition condition = lock.newCondition();

    public void conditionWait() throws InterruptedException {
        new Thread() {
            public void run() {
                lock.lock();
                try {
                    System.out.println("1");
                    condition.await();
                    System.out.println("2");
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }finally {
                    lock.unlock();
                }
            };
        }.start();
    }

    public void conditionSignal() throws InterruptedException{
        new Thread() {
            public void run() {
                lock.lock();
                try {
                    System.out.println("3");
                    condition.signal();
                    System.out.println("4");
                } finally {
                    lock.unlock();
                }
            };
        }.start();
    }

    public static void main(String[] args) throws InterruptedException {
        ThreadTest2 test = new ThreadTest2();

        test.conditionWait();

        Thread.sleep(2000);

        test.conditionSignal();
    }
}