Java多线程实现——Runnable和Thread的区别

快来打我* 2022-05-13 05:14 294阅读 0赞

synchronized ThreadLocal

转载：[https://blog.csdn.net/shakespeare001/article/details/51321498][https_blog.csdn.net_shakespeare001_article_details_51321498]

# 1.实现Runnable: #

package com;
    
    
    public class HelloWorld implements Runnable{
    
    	private int num=0;
    	public static void main(String[] args){
    	
    			HelloWorld hw=new HelloWorld();
    			new Thread(hw).start();
    			new Thread(hw).run();
    		
    	}
    
    	public void run() {
    		System.out.println("开始运行");
    		for(int i=0;i<5;i++) {
    			System.out.println(num++);
    		}
    	}	
    	
    	
    }

运行结果:我尝试运行了多次，大概有一下这两种结果：

![70][]

![70 1][]

package com;
    
    
    public class HelloWorld implements Runnable{
    
    	private int num=0;
    	public static void main(String[] args){
    	
    			HelloWorld hw=new HelloWorld();
    			new Thread(hw).start();
    			new Thread(hw).start();
    		
    	}
    
    	public void run() {
    		System.out.println("开始运行");
    		for(int i=0;i<5;i++) {
    			System.out.println(num++);
    		}
    	}	
    	
    	
    }

运行结果：

有以下几种：

![70 2][]

![70 3][]

![70 4][]

![70 5][]

![70 6][]

# 2.继承 Thread #

package com;
    
    
    public class HelloWorld extends Thread{
    
    	private int num=0;
    	public static void main(String[] args){
    	
    			new HelloWorld().start();
    			new HelloWorld().start();
    		
    	}
    
    	public void run() {
    		System.out.println("开始运行");
    		for(int i=0;i<5;i++) {
    			System.out.println(num++);
    		}
    	}	
    	
    	
    }

运行结果：

![70 7][]

![70 8][]

![70 9][]

## 分析 ：继承（extends）自Thread来实现多线程时，每个线程都独立拥有一份自己的变量，各个线程之间不能实现资源的共享；而实现（implements)Runnable来实现多线程时，可以实现各个线程之间资源的共享。 ##

[https_blog.csdn.net_shakespeare001_article_details_51321498]: https://blog.csdn.net/shakespeare001/article/details/51321498
[70]: /images/20220513/942aed0a17a54146b3d39020d66e16e0.png
[70 1]: /images/20220513/2b63e7d691a04ab48900a7d9c6329712.png
[70 2]: /images/20220513/bb4036c0b1fd47f5990393beb72f9ae9.png
[70 3]: /images/20220513/c3569277640b4709af52c52cc5379b93.png
[70 4]: /images/20220513/3379d46e7e124bdbbfdbfeed03ea16a3.png
[70 5]: /images/20220513/7f12019d7b1640fbbae7a9535814787f.png
[70 6]: /images/20220513/4ff0acc0c4c24c2d8fb1c0c58a4aa724.png
[70 7]: /images/20220513/9aed0bbcbba1494e811b4e04dd4b17a7.png
[70 8]: /images/20220513/36b19951e5c44e12aa50cb6cfd25d978.png
[70 9]: /images/20220513/8d79a81aeb65487a89c480b010b06cd7.png