package cn.xiaoxuzhu.daily;
 
import java.util.concurrent.CountDownLatch;
 
public class AbcTest {
    public static void main(String[] args) {
        CountDownLatch countDownLatch =new CountDownLatch(2);
        //線程A
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(2000);
 
                }catch (InterruptedException e){
                    e.printStackTrace();
 
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程A執(zhí)行結(jié)束");
                countDownLatch.countDown();
            }
        },"線程A").start();
        //線程B
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程B執(zhí)行結(jié)束");
                countDownLatch.countDown();
            }
 
        },"線程B").start();
 
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                  countDownLatch.await();
                }catch (InterruptedException e){
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程C執(zhí)行結(jié)束");
                countDownLatch.countDown();
            }
 
        },"線程C").start();
 
    }
}

package cn.xiaoxuzhu.daily;
 
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
/**
 * Description: 有3個線程。線程A和線程B并行執(zhí)行，線程C需要A和B執(zhí)行完成后才能執(zhí)行?？梢栽趺磳崿F(xiàn)？
 *
 * @author 小王同學
 * @version 1.0
 * @Description: */
 
public class AbcTest2 {
 
    public static void main(String[] args) {
        CyclicBarrier cyclicBarrier=new CyclicBarrier(3);
        //線程A
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(2000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程A執(zhí)行結(jié)束");
                try {
                    cyclicBarrier.await();//符合三個線程都到達柵欄才往下執(zhí)行
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (BrokenBarrierException e) {
                    e.printStackTrace();
                }
            }
        },"線程A").start();
 
        //線程B
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程B執(zhí)行結(jié)束");
                try {
                    cyclicBarrier.await();//符合三個線程都到達柵欄才往下執(zhí)行
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (BrokenBarrierException e) {
                    e.printStackTrace();
                }
            }
        },"線程B").start();
 
        //線程C
        new Thread(new Runnable() {
            @Override
            public void run() {
                //等待A,B線程完成
                try {
                    cyclicBarrier.await();//符合三個線程都到達柵欄才往下執(zhí)行
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (BrokenBarrierException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName()+":"+"線程C執(zhí)行結(jié)束");
            }
        },"線程C").start();
    }
}