(1)private static CountDownLatch latch = new CountDownLatch(3);
(2)latch.countDown();
(3)latch.await();
import java.util.concurrent.CountDownLatch;
public class text{
/** * 模拟爸爸去饭店 */
public static void fatherToRes() {
System.out.println("爸爸步行去饭店需要3小时。");
}
/** * 模拟我去饭店 */
public static void motherToRes() {
System.out.println("妈妈挤公交去饭店需要2小时。");
}
/** * 模拟妈妈去饭店 */
public static void meToRes() {
System.out.println("我乘地铁去饭店需要1小时。");
}
/** * 模拟一家人到齐了 */
public static void togetherToEat() {
System.out.println("一家人到齐了，开始吃饭");
}
private static CountDownLatch latch = new CountDownLatch(3);
public static void main(String[] args) throws InterruptedException {
new Thread() {
public void run() {
fatherToRes();
latch.countDown();
};
}.start();
new Thread() {
public void run() {
motherToRes();
latch.countDown();
;
}.start();
new Thread() {
public void run(){
meToRes();
latch.countDown();
};
}.start();
latch.await();
togetherToEat();
}
}
原文：http://www.cnblogs.com/JaneSJ/p/5910622.html