Thread t2 = new Thread(new Runnable() {
@Override
public void run() {
synchronized (lock) {
if (list2.size() != 5) {
try {
//释放锁，让其他线程执行
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("当前线程：" + Thread.currentThread().getName() + "收到通知线程停止..");
throw new RuntimeException();
}
}
}, "t2");
t2.start();
t1.start();
}
}
程序输出：
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
已经发出通知..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t1添加了一个元素..
当前线程：t2收到通知线程停止..
Exception in thread "t2" java.lang.RuntimeException
at com.ietree.multithread.sync.ListAdd3$2.run(ListAdd3.java:59)
at java.lang.Thread.run(Unknown Source)
三、使用CountDownLatch类来实现多线程中线程之间的实时通信
package com.ietree.multithread.sync;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
public class ListAdd2 {
private volatile static List list = new ArrayList();
public void add() {
list.add("apple");
}
public int size() {
return list.size();
}
public static void main(String[] args) {
final ListAdd2 list2 = new ListAdd2();
final CountDownLatch countDownLatch = new CountDownLatch(1);
Thread t1 = new Thread(new Runnable() {
@Override
public void run() {
try {
for (int i = 0; i < 10; i++) {
list2.add();
System.out.println("当前线程：" + Thread.currentThread().getName() + "添加了一个元素..");
Thread.sleep(500);
if (list2.size() == 5) {
System.out.println("已经发出通知..");
countDownLatch.countDown();
}
}
// }
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}, "t1");