技術標籤：塊程式碼

import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;

/**
 * 計數器：增加到一定數值，才可以呼叫某執行緒
 * 集齊7顆龍珠。才可召喚神龍
 * 人到齊了才能開會 先到的先等。
 */
public class CyclicBarrierDemo {

    public static void main(String[] args) {
        final CyclicBarrier cyclicBarrier = new CyclicBarrier(7, new Runnable() {
            @Override
            public void run() {
                System.out.println("龍珠集齊，召喚神龍");
            }
        });
        for (int i = 1; i < 8; i++) {
            final int temp = i;
            Thread thread = new Thread(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName() +"執行緒收集到" + temp +"號龍珠");

                    try {
                        cyclicBarrier.await();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } catch (BrokenBarrierException e) {
                        e.printStackTrace();
                    } finally {
                    }

                }
            });
            thread.setName(i+"");
            thread.start();
        }
    }
}