regula inner class

Accept a string from user and check whether is number ( using inner class)

inner class 乍看起来和普通的类区别不大。但是inner class 的典型用法是在其外部类里添加methods，用以返回指向内部类的reference。If you want to make an object of the inner class anywhere except from within a non-static method of the outer class, y......
答案就在这里：inner class
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