package com.wkcto.join;

import java.util.Random;

/**
 * 演示join方法
 */
public class Test {
    static  class SubThread extends Thread{
        @Override
        public void run() {
            int xx = new Random().nextInt(10000);
            System.out.println("在子線程中產(chǎn)生了數(shù)據(jù): " + xx);
            try {
                Thread.sleep(xx);       //模擬子線程運(yùn)行耗時(shí)
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) throws InterruptedException {
        SubThread t = new SubThread();
        t.start();

//        Thread.sleep();
        t.join();   //程序執(zhí)行這條語句,當(dāng)前main線程會(huì)轉(zhuǎn)為等待狀態(tài),等到t線程運(yùn)行結(jié)束后,當(dāng)前線程會(huì)轉(zhuǎn)為Runnable可運(yùn)行狀態(tài)

        System.out.println("當(dāng)前線程是主線程,想在t線程執(zhí)行完后再執(zhí)行,可以在這條語句前通過sleep()讓主線程睡眠,但是睡眠的時(shí)長(zhǎng)如何確定? 因?yàn)樽泳€程耗時(shí)不確定,所以主線程睡眠的時(shí)長(zhǎng)不確定.這時(shí),就可以使用join()方法");
    }
}