实现 Runnable 接口

/**
 * @Description 实现 Runnable 接口
 */
package com.ai.demo01;

import org.apache.commons.io.FileUtils;

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

//练习 Thread , 实现多线程同步下载图片
public class TestThread2 implements Runnable{

    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://tse3-mm.cn.bing.net/th/id/OIP-C.TUKYhAWfxGhNf8oecCTx2wHaEK?w=271&h=180&c=7&r=0&o=5&dpr=1.3&pid=1.7","1.jpg");
        TestThread2 t2 = new TestThread2("https://tse3-mm.cn.bing.net/th/id/OIP-C.TUKYhAWfxGhNf8oecCTx2wHaEK?w=271&h=180&c=7&r=0&o=5&dpr=1.3&pid=1.7","2.jpg");
        TestThread2 t3 = new TestThread2("https://tse3-mm.cn.bing.net/th/id/OIP-C.TUKYhAWfxGhNf8oecCTx2wHaEK?w=271&h=180&c=7&r=0&o=5&dpr=1.3&pid=1.7","3.jpg");

        new Thread(t1).start();
        new Thread(t2).start();
        new Thread(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,downloader方法出现问题");
        }
    }
}

/**
 * @Description 实现 Runnable 接口
 */
package com.ai.demo01;

//创建线程方式 2 : 实现 Runnable 接口 , 执行线程需要丢入 runnable 接口实现类 , 调用 start 方法 。
public class TestThread3 implements Runnable{
    @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) {
        //创建 runnable 接口的实现类对象
        TestThread3 testThread3 = new TestThread3();
        //创建线程对象，通过线程对象来开启我们的线程，代理
        /*Thread thread = new Thread(testThread3);

        thread.start();*/

        new Thread(testThread3).start();

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