初级代码挑错并解释原因

初级代码挑错并解释原因，欢迎拍砖。。。

[code="java"]public static void main(String[] args)
{
String tmp="Hello";

    Thread t = new Thread(){
        public void run(){

            System.out.println(tmp);
        }

    };
    t.start();
}[/code]

这还用解释吗？
给方法里的内部类的方法传参数，需要用fianl修饰

Cannot refer to a non-final variable tmp inside an inner class defined in a different method
就是这句话的意思
很明显啊

这种错让eclipse来挑比较好：
[color=red]
Cannot refer to a non-final variable tmp inside an inner class defined in a different method
[/color]