21.与重入锁相关联的Condition

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 与重入锁相关联的Condition
 */
public class ConditionDemo implements Runnable{
    public static ReentrantLock lock = new ReentrantLock();
    public static Condition condition = lock.newCondition();
    @Override
    public void run() {
        try {
            lock.lock();
            condition.await();//使当前线程等待，同时释放当前锁
            System.out.println("Thread is going on");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public static void main(String[] args) throws InterruptedException{
        ConditionDemo t = new ConditionDemo();
        Thread t1 = new Thread(t);
        t1.start();
        Thread.sleep(2000);
        //通知线程t1继续执行
        lock.lock();//调用signal()的方法时，线程要先获得相关的锁
        condition.signal();//唤醒一个在等待中的线程
        lock.unlock();//signal()调用后释放相关的锁给被唤醒的线程
    }
}