java - Inheritance Across Packages

Question

Let's say we have package a and package b, both have many classes, all public.

Now class Cat from package a wants to extend class Animal from package b, is this inheritance legal?

Answer 1

当然，只需导入父类并扩展它。

package a;

import b.Animal;

public class Cat extends Animal {

}

您也可以跳过导入并为 Animal 使用完全限定的类名。但是比较乱。

Answer 2

是的。包使分组类方便，非公共和非私有方法和字段仅对同一包的其他成员可见