单列模式下的ThreadLocal

ThreadLocal详细介绍：http://www.cnblogs.com/ieage/archive/2012/05/16/2505426.html

import java.util.Random;

/**
 * 通过单列模式将ThreadLocal屏蔽，这样每个线程的对象的数据都不会出产生重复
 * 把数据封装成一个类，这样可以保存多个数据，每个数据用单列模式和ThreadLocal保证了对象在同一个线程共享不会产生混乱
 * @author MrRock
 *
 */
public class ThreadLocalByObject {
	public static void main(String[] args) {
		for(int i=0;i<2;i++){
			new Thread(new Runnable(){
				@Override
				public void run() {
					int data = new Random().nextInt();
					User user = User.getThreadInstance();  //单列获取
					user.setAge(data);
					user.setName(String.valueOf(data));
					new A().getData();
					new B().getData();
				}
			}).start();
		}
	}
	static class A{
		public void getData(){
		  User user = User.getThreadInstance(); //单列获取
		  System.out.println("ClassA---> : " + Thread.currentThread().getName() + " name: " +  user.getName() +" age: "+user.getAge());
		}
	}
	static class B{
		public void getData(){
		  User user = User.getThreadInstance(); //单列获取
		  System.out.println("ClassB---> : " + Thread.currentThread().getName() + " name: " +  user.getName() +" age: "+user.getAge());
		}
	}
}

//单列模式
class User { //保证线程的唯一性，每个线程之间数据不会混乱
	private User(){};
	public static /*Synchronized*/ User getThreadInstance(){ //使用ThreadLocal就不用Synchronized
		User instance = map.get();  //从ThreadLocal获取
		if(instance == null){
			instance = new User();
			map.set(instance);     //写入ThreadLocal
		}
		return instance;
	}
	//private staic  User instance = new User(); 
	//在ThreadLocal写入一个User对象
	private static ThreadLocal<User> map = new ThreadLocal<User>();
	
	
	private String name;
	private int age;
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

}