听视频之：：ThreadLocal真正含义

<img alt="" src="http://my.csdn.net/uploads/201204/13/1334288858_1539.png" />


 


 


package cn.itcast.heima2; 
import java.util.Random; 
public class ThreadLocalTest { 
 private static ThreadLocal<Integer> x = new ThreadLocal<Integer>(); 
 private static ThreadLocal<MyThreadScopeData> myThreadScopeData = new ThreadLocal<MyThreadScopeData>(); 
 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(); 
     System.out.println(Thread.currentThread().getName() 
       + " has put data :" + data); 
     x.set(data); 
/*     MyThreadScopeData myData = new MyThreadScopeData(); 
     myData.setName("name" + data); 
     myData.setAge(data); 
     myThreadScopeData.set(myData);*/ 
     MyThreadScopeData.getThreadInstance().setName("name" + data); 
     MyThreadScopeData.getThreadInstance().setAge(data); 
     new A().get(); 
     new B().get(); 
    } 
   }).start(); 
  } 
 } 
 static class A{ 
  public void get(){ 
   int data = x.get(); 
   System.out.println("A from " + Thread.currentThread().getName() 
     + " get data :" + data); 
/*   MyThreadScopeData myData = myThreadScopeData.get();; 
   System.out.println("A from " + Thread.currentThread().getName() 
     + " getMyData: " + myData.getName() + "," + 
     myData.getAge());*/ 
   MyThreadScopeData myData = MyThreadScopeData.getThreadInstance(); 
   System.out.println("A from " + Thread.currentThread().getName() 
     + " getMyData: " + myData.getName() + "," + 
     myData.getAge()); 
  } 
 } 
 static class B{ 
  public void get(){ 
   int data = x.get();    
   System.out.println("B from " + Thread.currentThread().getName() 
     + " get data :" + data); 
   MyThreadScopeData myData = MyThreadScopeData.getThreadInstance(); 
   System.out.println("B from " + Thread.currentThread().getName() 
     + " getMyData: " + myData.getName() + "," + 
     myData.getAge());    
  }   
 } 
} 
class MyThreadScopeData{ 
 private MyThreadScopeData(){} 
 public static /*synchronized*/ MyThreadScopeData getThreadInstance(){ 
  MyThreadScopeData instance = map.get(); 
  if(instance == null){ 
   instance = new MyThreadScopeData(); 
   map.set(instance); 
  } 
  return instance; 
 } 
 //private static MyThreadScopeData instance = null;//new MyThreadScopeData(); 
 private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>(); 
  
 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; 
 } 
}

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听视频之：：ThreadLocal真正含义

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