摘要: 1.抽象类:里面有抽象方法时,就要声明该类为抽象类 public abstract class Animal { private String name; private int age; public Animal() { } public Animal(String name, int age) 阅读全文
posted @ 2024-12-16 22:54 f-52Hertz 阅读(0) 评论(0) 推荐(0) 编辑
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