基于单例使用ThreadLocal对多线程下数据的访问修改

package cn.lyy.thread;

import java.util.Random;


/**
 * 基于单例模式的基础上，使用ThreadLocal为每一个进入的线程生成一个实例，
 * 用来对数据的访问修改而不影响到别的线程对同一个数据的修改
 * @author Administrator
 *
 */
public class ThreadLocalTest {

    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(20);
                    MyThreadScopeData.getThreadInstance().setAddress(
                            "wuyidaxue" + data);
                    MyThreadScopeData.getThreadInstance().setAge(data);
                    new A().get();
                    new B().get();
                }
            }).start();
        }
    }

    static class A {

        public void get() {
            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out.println("A from " + Thread.currentThread().getName()
                    + " getMyData: " + myData.getAddress() + ","
                    + myData.getAge());
        }

    }

    static class B {

        public void get() {

            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out.println("B from " + Thread.currentThread().getName()
                    + " getMyData: " + myData.getAddress() + ","
                    + myData.getAge());

        }
    }
}

class MyThreadScopeData {

    private MyThreadScopeData() {
    }

    public static MyThreadScopeData getThreadInstance() {
        MyThreadScopeData instance = map.get();
        if (instance == null) {
            instance = new MyThreadScopeData();
            map.set(instance);
        }
        return instance;

    }

    private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>();

    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public int getAge() {
        return age;
    }

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

    private int age;
}