java线：辛格尔顿隐藏ThreadLocal实现线程数据共享

效果图分享：

A和B需要共享同一线程，还有一组的相同A和B共享还有一组线程，两组相互之间不受影响。

代码：

package cn.itcast.lesson6;
import java.util.Random;
public class ThreadLocalTest {
	public static void main(String[] args) {
		for(int i=0;i<2;i++){
			new Thread(new Runnable() {

				public void run() {
					int data = new Random().nextInt();
					System.out.println(Thread.currentThread().getName()
							+" has put data: " + data);
					MyThreadScopeData.getThreadInstance().setName("name" + 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.getName()+" , "
					+ myData.getAge());
		}
	}
	static class B{
		public void get(){
			MyThreadScopeData myData =  MyThreadScopeData.getThreadInstance();
			System.out.println("B from" + Thread.currentThread().getName()
					+ " getMyData:"+myData.getName()+" , "
					+ myData.getAge());
		}
	}
}
 class  MyThreadScopeData{
	private MyThreadScopeData(){}
//单例隐藏ThreadLocal实现数据共享
	public static /*synchronized*/ 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 name;
	private int age;
	public String getName() {
		return name;
	}

	public  void setName(String name) {
		this.name = name;
	}
	public  void setAge(int age) {
		this.age = age;
	}
	public int getAge() {
		return age;
	}
}

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