Java多线程与并发应用-(5)-如何优雅的使用ThreadLocal类

内容来自，张孝祥老师的张孝祥-Java多线程与并发库高级应用》视频教程

package com.lipeng;

public class MyThreadLocalTest2 {

	private final static MyThreadLocal<String> myThreadLocal=new MyThreadLocal<String>();
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new Thread(){
			public void run() {

				ThreadLocalData.getThreadLocalData().setAge(12);
				ThreadLocalData.getThreadLocalData().setName("张三");
				System.out.println(Thread.currentThread().getName()+"----------------"+A.getName());
				System.out.println(Thread.currentThread().getName()+"----------------"+B.getName());
			};
		}.start();
		new Thread(){
			public void run() {
				ThreadLocalData.getThreadLocalData().setAge(18);
				ThreadLocalData.getThreadLocalData().setName("李四");
				System.out.println(Thread.currentThread().getName()+"----------------"+A.getName());
				System.out.println(Thread.currentThread().getName()+"----------------"+B.getName());

			};
		}.start();

	}
	static class A
	{
		public static String getName()
		{
			return  ThreadLocalData.getThreadLocalData().getName();
		}

		public static void setName(String name)
		{
			myThreadLocal.set(name);
		}
	}

	static class B
	{
		public static String getName()
		{
			return  ThreadLocalData.getThreadLocalData().getName();
		}
		public static void setName(String name)
		{
			myThreadLocal.set(name);
		}
	}
}

class ThreadLocalData
{
	private static ThreadLocal<ThreadLocalData> threadLocal=new ThreadLocal<ThreadLocalData>();
	private String name;
	private int age;
	private ThreadLocalData(){  //不提供public的构造方法，只提供一个静态工厂方法，此方法返回与当前线程有关的当前类的实例对象。

	}

	public static ThreadLocalData getThreadLocalData()
	{
		ThreadLocalData threadLocalData=threadLocal.get();
		if(threadLocalData==null)
		{
			threadLocalData=new ThreadLocalData();
			threadLocal.set(threadLocalData);
		}
		return threadLocalData;
	}

	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;
	}

}

<span style="white-space:pre">	</span>我们在获取一个与线程绑定的对象时，不希望看到ThreadLocal，而是直接得到与当前线程绑定的对象，在这里，将线程绑定的类的构造方法private，提供一个静态方法，使得要获得这个类的对象，必须通过这个方法，而这个方法是从ThradLocal中get到的即使当前线程绑定的实例。