Thread

package ThreadDome;

/**

• Thread类
  *自定义继承Thread
  *重写run()方法，编写线程执行体
  *创建线程对象，调用start（）方法启动线程
• 线程开启比一定立即执行，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) {
    //创建一个线程对象
      testThread testThread1 = new testThread();
      //调用static()方法开启线程
    testThread1.start();
    //main线程，主线程
    for (int i = 0; i < 200; i++) {
        System.out.println("我在学习线程"+i);

    }

}

}
package ThreadDome;
//练习Thread，实现多线程同步下载图片
/**

• <img src="<img src="https://img2020.cnblogs.com/blog/2345423/202105/2345423-20210519103012786-1006359979.bmp
  */

import org.apache.commons.io.FileUtils;

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

public class ThreadDome1 extends Thread {
//public class Runabledome implements Runnable {
private String url;//网络图片下载地址
private String name;//保存文件名
public ThreadDome1(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) {
    ThreadDome1 t1 = new ThreadDome1("https://img2020.cnblogs.com/blog/2345423/202105/2345423-20210519103012786-1006359979.bmp","1.jpg");
    ThreadDome1 t2 = new ThreadDome1("https://img2020.cnblogs.com/blog/2345423/202105/2345423-20210519103026707-579911421.bmp","2.jpg");
    t1.start();
    t2.start();

// new Thread(t1).start();
new Thread(t2).start();

}

}
class WebDownLoader {
public static void downloader(String url, String name) {
}

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方法出现异常");
    }
}

}