线程范围内共享变量的概念与作用

/**
 * ThreadScopeShareData.java
 * cn.com.songjy.test.socket.thread
 * Function： TODO 
 *
 *   version    date      author
 * ──────────────────────────────────
 *   	1.0	 2013-8-16    songjy
 *
 * Copyright (c) 2013, TNT All Rights Reserved.
*/

package cn.com.songjy.test.socket.thread;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * ClassName:ThreadScopeShareData
 * 线程范围内共享变量的概念与作用
 * @author   songjy
 * @version  1.0
 * @since    v1.0
 * @Date	 2013-8-16	下午4:04:45
 */

public class ThreadScopeShareData {
	
	private static Log log = LogFactory.getLog(ThreadScopeShareData.class);
	private static Map<Thread, Integer> thread_data = new HashMap<Thread, Integer>();
	private static int data;

	public static void main(String[] args) {
		
		for(int i=0; i<5; i++)
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				data = new Random().nextInt();
				int data = new Random().nextInt();
				log.info(Thread.currentThread().getName() + " has put data :" + data);
				thread_data.put(Thread.currentThread(), data);
				new A().get();
				new B().get();
			}
		}).start();
	}
	
	static class A {
		public void get(){
			int data = thread_data.get(Thread.currentThread());
			log.info("A from " + Thread.currentThread().getName() + " get data :" + data);
		}
	}
	
	static class B {
		public void get(){
			int data = thread_data.get(Thread.currentThread());
			log.info("B from " + Thread.currentThread().getName() + " get data :" + data);
		}
	}
}

引自
http://down.51cto.com/data/443412