目录密封类密封接口何时使用密封类与密封接口密封类和密封接口是 Kotlin 中允许创建受限类层次js结构的两个特性。这两个构造用于定义一组有限的可能子类型，并防止在声明的层次结构之外定义其他子类型。
I noticed that there are two ways to create C++ objects: BTree *btree = new BTree; and BTree btree; From what I can tell, the only开发者_JS百科 difference is in how class objects are accessed (.
加载中,请稍侯......