JAVA 复习-跟随狂神学JAVA-多线程复习01继承Thread

01继承Thread创建多线程

package com.kuangshen;

//创建线程方式一：继承Thread类，重写run()方法，调用start()开启线程

//总结：注意，线程开启不一定立即执行，由CPU调度执行

public class TestThread extends Thread{
    @Override
    public void run() {
        //run方法线程体
        for (int i = 0; i < 20; i++) {
            System.out.println("我在看代码---"+i);
        }
    }

    public static void main(String[] args) {
        //main线程，主线程

        //创建一个线程对象
        TestThread testThread = new TestThread();
        //调用star方法 开启线程
        testThread.start();

        for (int i = 0; i < 20; i++) {
            System.out.println("我在学习多线程---"+i);
        }
    }
}

package com.kuangshen;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

public class TestThread2 extends Thread{
    private String url; //网络图片地址
    private String name; //保存的文件名

    public TestThread2(String url,String name){
        this.url = url;
        this.name = name;
    }

    //下载图片线程的执行体
    @Override
    public void run() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url,name);
        System.out.println("下载了文件名为:"+name);
    }

    public static void main(String[] args) {
        TestThread2 t1 = new TestThread2("https://www.kuangstudy.com//assert/course/c1/01.jpg","1.jpg");
        TestThread2 t2 = new TestThread2("https://www.kuangstudy.com//assert/course/c1/02.jpg","2.jpg");
        TestThread2 t3 = new TestThread2("https://www.kuangstudy.com//assert/course/c1/03.jpg","3.jpg");

        //先下载t1
        t1.start();
        //然后是t2
        t2.start();
        //最后是t3
        t3.start();
    }
}


//下载器
class WebDownloader{
    //下载方法
    public void downloader(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常，download方法出现问题");
        }
    }
}

JAVA 复习-跟随狂神学JAVA-多线程复习01继承Thread

原文：https://www.cnblogs.com/deathpanda/p/14683504.html