ThreadLocal

private static ThreadLocal tl = new ThreadLocal();

public static void main(String[] args) {
	
	tl.set("nihao");//容器：Map容器--》[key:當前線程對象,value:nihao]
	
	Object o = tl.get();//預設的key是當前線程
	System.out.println(o);//nihao
	
	tl.remove();//預設的key是當前線程
	
	o = tl.get();
	System.out.println(o);
}