Condition 导致活锁

Question

问题遇到的现象和发生背景

两个线程相互等待打印数据，使用Condition ,活锁。 不知道怎么写才对

问题相关代码，请勿粘贴截图

public class LockAndCondition {
@Test
public void t1() throws InterruptedException {
Lock lock = new ReentrantLock();
Masthead m1 = new Masthead(new Object[]{1, 2, 3}, lock, "T1");
Masthead m2 = new Masthead(new Object[]{"A", "B", "C"}, lock, "T2");
m1.start();
Thread.sleep(1000);
m2.start();
m1.join();
m2.join();
}

}

class Masthead extends Thread {
Object[] data;
Lock lock;
Condition condition;
String name;

public Masthead(Object[] data, Lock lock, String name) {
    this.data = data;
    this.lock = lock;
    this.condition = lock.newCondition();
    this.name = name;
    setName(name);
}


@Override
public void run() {
    try {
        lock.lock();
        for (Object d : data) {
            System.out.println(d);
            condition.signalAll();
            condition.await();
        }
        condition.signalAll();
    } catch (InterruptedException e) {
        e.printStackTrace();
    } finally {
        lock.unlock();
    }
}

}

运行结果及报错内容

结果就是两个线程都进行等待，活锁了