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Java的学习笔记（15）对象十

对象16：接口的定义与实现接口：只有规范！自己无法写方法，专业的约束！约束和现实分离：面向接口编程。声明类的关键字是class，声明接口的关键字是interface接口的作用约束定义一些方法，让不同的人实现public abstractpublic static final接口不能被实...

Java的学习笔记（14）对象九

对象15：抽象类 abstractpackage oop.Dmoe09; //abstract 抽象类 public abstract class Action { // 约束~有人帮我们实现 //abstract ，抽象方法，只有方法名字，没有方法的实现 public abstract void...

Java的学习笔记（13）对象八

对象14：static关键字详解package oop.Demo08; //static : public class Student { private static int age; //静态的变量 private double score; // 非静态的变量 public void run(...

Java的学习笔记（12）对象七

对象13.1：instanceofinstanceof（类型转换）引用类型，判断一个对象是什么类型package oop.Demo07; public class Application { public static void main(String[] args) { // Object >...

Java的学习笔记（11）对象六

对象11：方法重写重写：需要有继承关系，子类重写父类的方法！方法名必须相同参数列表必须相同修饰符：范围可以扩大,范围可以扩大不能缩小：public>protected>default>private抛出异常：范围可以被缩小但是不能扩大；classNotFoundExc...

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