英文:
How to make a type part of another type? (Java)
问题
这个问题的措辞不够清晰，但基本上我创建了一些可以用作类型的类，例如Dog、Cat、Whale等。我还创建了另一个类，可以接受一个宠物。如何使类似dog、cat等的类属于宠物类型？
英文:
This question isn't worded the best, but essentially I created some classes that can be used as types called Dog, Cat, Whale, etc. I also made another class that could take in a pet. How would I make classes like dog, cat, etc. belong to the pet type?
答案1
得分: 0
你正在寻找的东西叫做继承。在Java中，你可以在类定义中使用extends关键字来使一个类扩展另一个类。
例如：
public class Dog extends Pet { ...
英文:
What you're looking for is called inheritance. In Java, you use the extends keyword in the class definition to make one class extend another.
For example:
public class Dog extends Pet { ...
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