Java线程，如何让一个线程总是先停止或先结束？

Thread thread1 = new Thread(new Runnable() {
    @Override
    public void run() {
        // 线程1的逻辑
    }
});

Thread thread2 = new Thread(new Runnable() {
    @Override
    public void run() {
        // 线程2的逻辑
    }
});

thread1.start();
thread1.join(); // 等待线程1执行完毕
thread2.start();

class MyRunnable implements Runnable {
    private volatile boolean flag = false;

    @Override
    public void run() {
        while (!flag) {
            // 线程的逻辑
        }
    }

    public void stop() {
        flag = true;
    }
}

MyRunnable runnable = new MyRunnable();
Thread thread1 = new Thread(runnable);
Thread thread2 = new Thread(runnable);

thread1.start();
thread2.start();

// 先停止线程1
runnable.stop();

class MyRunnable implements Runnable {
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();
    private boolean flag = false;

    @Override
    public void run() {
        lock.lock();
        try {
            while (!flag) {
                condition.await();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }

    public void stop() {
        lock.lock();
        try {
            flag = true;
            condition.signal();
        } finally {
            lock.unlock();
        }
    }
}

MyRunnable runnable = new MyRunnable();
Thread thread1 = new Thread(runnable);
Thread thread2 = new Thread(runnable);

thread1.start();
thread2.start();

// 先停止线程1
runnable.stop();