转--秒杀多线程第四篇一个经典的多线程同步问题（续）

原创于 2018-04-01 22:02:17 发布 · 114 阅读

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本文展示了一个Java多线程程序实例，通过继承Thread类创建了多个线程，并演示了如何启动这些线程来更新全局变量并打印结果。

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demo in java：

package com.multithread.main.sampleExample;

import com.multithread.main.ExampleInterface;

public class SampleExample extends ExampleInterface{

    final int MAX_THREAD_NUM = 10;
    int g_num = 0;
    @Override
    public void startDemo() {
        int i=0;
        while(i<MAX_THREAD_NUM)
        {
            Thread t = new SampleMultiThread(i);
            t.start();
            i++;
        }
    }
    
    
    class SampleMultiThread extends Thread{

        int index = -1;
        public SampleMultiThread(int index)
        {
            this.index = index;            
        }
        
        @Override
        public void run() {
            // TODO Auto-generated method stub
            g_num++;
            System.out.println("g_num is:"+g_num +"\t"+"index is:"+this.index);
        }
        
        
        
    }

}

result：

g_num is:2   index is:0
g_num is:8   index is:6
g_num is:7   index is:9
g_num is:6   index is:7
g_num is:5   index is:5
g_num is:4   index is:3
g_num is:3   index is:2
g_num is:2   index is:1
g_num is:10   index is:8
g_num is:10   index is:4