In case of upcasting, the methods of the child class are called.
在案例上，孩子的类的方法被称为。
Thus, casting to a base type is moving up the inheritance diagram: upcasting.
所以，造型就是沿着继承图朝着基类向上：向上造型。
Upcasting is applied automatically when you pass arguments to methods on an object type.
当您向某个对象类型上的方法传递参数时，将自动应用向上转换。
When you upcast to a base interface, you can only access the members specified by that interface, just as for upcasting to base classes.
当你上溯到基接口时，你只可以访问由那个接口所指定的成员，就像上溯到基类那样。
When you upcast to a base interface, you can only access the members specified by that interface, just as for upcasting to base classes.
当你上溯到基接口时，你只可以访问由那个接口所指定的成员，就像上溯到基类那样。
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