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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...

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（2）

访问修饰限定符java中的字段和方法的四种访问权限public可以在不同包中的类访问！protected不同包中继承关系访问！默认包访问权限，只能在同一包中的类中访问！privated只能在同一个类中访问多态在编程语言和类型论中，多态（英语：polymorphism）指为不同数据类型的...

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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三、多态多态（字面意思）：一种事物多种形态多态中有三种重要的语法基础：向上转型、动态绑定、重写。缺一不可~ 理解多态就需要理解：向上转型，即（父类对象引用子类对象）（1）向上转型public static void main(String[] args) { Animal animal = new...

【JAVA SE】——包、继承、多态、抽象类、接口 ( 巨细！总结 )1

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