- 定义一个动物类，具有年龄，体重，跑动和吃东西等属性和方法，为属性生成相应的get和set方法以及构造方法。
- 定义一个猫科类，继承动物类。并且具有自己的行为：喵喵叫。
- 定义一个老虎类，继承猫科类。
- 生成一个老虎实例，让老虎喵喵叫。
java_exend's Introduction
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