java 併發 join 之 老王泡茶

package juc;

import java.util.concurrent.TimeUnit;

/**
 * @author yanjun.liu
 * @date 2020/7/1--17:00
 */
public class Test6 {

    public static void main(String[] args) throws InterruptedException {

        Thread lw= new Thread(()->{
            try {

                System.out.println("老王開始洗杯子");
                TimeUnit.SECONDS.sleep(1);
                System.out.println("老王開始燒水");
                TimeUnit.SECONDS.sleep(5);
                System.out.println("老王燒水完成");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        },"老王");

        Thread lisi=  new Thread(()->{
            try {
                System.out.println("李四開始找茶葉");
                TimeUnit.SECONDS.sleep(3);
                System.out.println("李四都做完了。。。。等老王燒開水，泡茶");
                //lisi等待老王
                lw.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("李四泡茶");

        });

        long start = System.currentTimeMillis();
        lw.start();
        lisi.start();
        //主線程等待，目的等待兩個線程執行完成，打印時間
        lisi.join();
        lw.join();
        long end = System.currentTimeMillis();
        System.out.println(start-end);
    }



}