JAVA 多线程3 (线程内共享)

package com.test;

import java.util.Random;

public class ThreadTest3
{

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		for (int i = 0; i < 2; i++)
		{
			new Thread(){
				@Override
				public void run()
				{
					TestData testData = TestData.getInstance();
					int data = new Random().nextInt();
					testData.setData(data);
					
					System.out.println(Thread.currentThread().getName()+" set Data:"+data);
					System.out.println(Thread.currentThread().getName()+" get A Data:"+new A().get());
					System.out.println(Thread.currentThread().getName()+" get B Data:"+new B().get());
				}
			}.start();
			
			try
			{
				Thread.sleep(100);
			}
			catch (InterruptedException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}

class A{
	public int get(){
		try
		{
			Thread.sleep(1000);
		}
		catch (InterruptedException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return TestData.getInstance().getData();
	}
}

class B{
	public int get(){
		try
		{
			Thread.sleep(1000);
		}
		catch (InterruptedException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return TestData.getInstance().getData();
	}
}

class TestData{
	
	private static ThreadLocal threadLocal = new ThreadLocal();
	private int data;
	
	public int getData(){
		return data;
	}
	
	public void setData(int data){
		this.data = data;
	}
	
	private TestData(){}
	public static TestData getInstance(){
		TestData testData = (TestData)threadLocal.get();
		if(testData == null){
			testData = new TestData();
			threadLocal.set(testData);
		}
		return testData;
	}
}