表示大家彼此等待,大家集合好後纔開始出發,分散活動後又在指定地點集合碰面,這就好比整個公司的人員利用週末時間集體郊遊一樣,先各自從家出發到公司集合後,再同時出發到公園遊玩,在指定地點集合後再同時開始就餐,…。
public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool();
final CyclicBarrier cb = new CyclicBarrier(3);
for(int i=0;i<3;i++){
Runnable runnable = new Runnable(){
public void run(){
try {
Thread.sleep((long)(Math.random()*10000));
System.out.println("線程" + Thread.currentThread().getName() +
"即將到達集合地點1,當前已有" + (cb.getNumberWaiting()+1) + "個已經到達," + (cb.getNumberWaiting()==2?"都到齊了,繼續走啊":"正在等候"));
cb.await();
Thread.sleep((long)(Math.random()*10000));
System.out.println("線程" + Thread.currentThread().getName() +
"即將到達集合地點2,當前已有" + (cb.getNumberWaiting()+1) + "個已經到達," + (cb.getNumberWaiting()==2?"都到齊了,繼續走啊":"正在等候"));
cb.await();
Thread.sleep((long)(Math.random()*10000));
System.out.println("線程" + Thread.currentThread().getName() +
"即將到達集合地點3,當前已有" + (cb.getNumberWaiting() + 1) + "個已經到達," + (cb.getNumberWaiting()==2?"都到齊了,繼續走啊":"正在等候"));
cb.await();
} catch (Exception e) {
e.printStackTrace();
}
}
};
service.execute(runnable);
}
service.shutdown();
}