在Java编程语言中，final关键字是指在一些情况下用来定义（修饰）一个只能被赋值一次的变量。因此一旦一个final变量被赋值，它的值就再也不能改变[1]。而被final定义的类不能被继承。被final定义的方法则不能被重写[2]。
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