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java面向对象编程_包_继承_多态_重载和重写_抽象类_接口_this和super（3）

接口基本语法//定义接口类型 interface IAnimal{ //抽象方法 // public static final 字段 }使用interface 定义一个接口接口中的方法一定是抽象方法, 因此可以省略 abstract接口中的方法一定是public, 因此可以省略public接口中只能...

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java面向对象编程_包_继承_多态_重载和重写_抽象类_接口_this和super（1）

包包（package）组织类的一种方式！使用包的目的：使类具有唯一性！包是组织类的一种方式，我们java中的多个类可以放到一个包中。就好比学校里的班级就是一个包，我们学生就是一个类，相同班级的我们都放在同一个包下！目的：使类具有唯一性！就是说不...

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