摘要：
final变量被定义为一个常量，是一个无法修改的量。我们只能给他赋值一次。 final, the variable can be defined as a constant and can not be changed;we only assgin the value for the final variable once. final定义的方法，无法被重写。 final, the definition of the method can not be covered; final定义的类，不能被继承 final, the definition of the class can not be 阅读全文
