ThreadLocal

package cn.bzxy.thread;

public class ThreadLocalTest {

	private static final ThreadLocal<User> userLocal=new ThreadLocal<ThreadLocalTest.User>();
	
	public static void main(String[] args) {
		User user=getUser();
		new Thread(new Runnable() {
			
			@Override
			public void run() {
				
				User user=getUser();
				
			}
		}).start();
		
		User user2=getUser();
	}

	private static User getUser(){
		User user=userLocal.get();
		if(user== null){
			user=new User();
			userLocal.set(user);
		}
		return user;
	}
	public static class User{
		
		public User(){
			System.out.println("user constructor "+Thread.currentThread().getName());
		}
		
	}
}