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(
                             "*daxue" + 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;
 }