十六、Condition等待通知

一、简介

我们可以使用syncronized和wait，notify实现等待通知。而syncronized的高级实现Lock，也可以实现等待通知，需要构造Condition的实例对象。

JDK文档：http://tool.oschina.net/uploads/apidocs/jdk-zh/java/util/concurrent/locks/Condition.html

二、代码示例

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

public class ConditionDemo {
    private static ReentrantLock lock = new ReentrantLock();
    private static Condition condition = lock.newCondition();

    public static void main(String[] args) throws InterruptedException {
        new Thread(() -> {
            try {
                lock.lock();
                condition.await();
                System.out.println("end await");
                lock.unlock();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }).start();
        Thread.sleep(3000);
        lock.lock();
        condition.signal();
        lock.unlock();
        System.out.println("finished");
    }
}