文章持续更新（2020/2/3 疫情严重 照顾好自己）
创建线程的三种方式
1.继承Thread 类
2.实现Runnable 接口
3.实现Callable 接口
本次开篇先从继承Thread 类讲起
关于Thread主要要认识两个类 run() 和 start（）
思路
1.创建：继承Thread,重写run
2.启动：创建子类对象+start

package 多线程基础;
//1.创建：继承Thread,重写run
//2.启动：创建子类对象+start
public class StratThread extends Thread{
	//线程入口点
	public void run() {//重写run方法
		for (int i = 0; i <50; i++) {
			System.out.println("一边code");
		}
	}
	public static void main(String[] args) {
		StratThread st =new StratThread();//创建子类对象
		st.start();//启动 不保证立即运行  由cpu调用
		for (int i = 0; i < 50; i++) {
			System.out.println("一边听歌");
		}
	}
}

基于Thread的网页图片下载
运用到了Commons-io 工具类
下载工具

package 多线程基础;

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

import org.apache.commons.io.FileUtils;

public class WedLode {
	public void download(String url, String name) {
		try {
			FileUtils.copyURLToFile(new URL(url), new File(name));
			
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("网址有误");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("下载失败");
		}
	}

}

下载

package 多线程基础;

public class lode extends Thread {
	private String url;
	private String name;
	public lode(String url, String name) {
	
		this.url = url;
		this.name = name;
	};
     public void run() {
    	WedLode st =new WedLode();
    	 st.download(url, name);
     }
     public static void main(String[] args) {
		lode down =new lode("http://img.netbian.com/file/2020/0201/ef20367cc4a93b52a5020b9dc0cf9df3.jpg", "桃花1.jpg");
		lode down2 =new lode("http://img.netbian.com/file/2020/0201/b0ef1bdc2e80ef60d256f9a76dc6a818.jpg", "桃花2.jpg");
		lode down3 =new lode("http://img.netbian.com/file/2020/0202/fdae5e7ca266207dc526411106df77e2.jpg", "湖面.jpg");
		down.start();
		down2.start();
		down3.start();
	}
}