面向对象的基本概念

面向对象的基本概念

1，对象

2，类

3，封装

4，继承

5，消息

6，多态性

优点

1，符合人们认识事物的规律

2，改善了程序的可读性

3，使人机交互更加贴近自然语言

 

package Com.TableTest;

public class TableText_19 {
    public static void main(String[] args){
    Circle c=new Circle(2,"borter");
    System.out.println(c.name);
    c.Circle();
    }
}
class Shape {
    
    protected String name;
     
    public Shape(){
        name = "shape";
    }
     
    public Shape(String name) {
        this.name = name;
    }
}

 
class Circle extends Shape {
     
    private double radius;
     
    public Circle() {
        radius = 0;
    }
     
    public Circle(double radius) {
        this.radius = radius;
       
    }
     
    public Circle(double radius,String name) {
        this.radius = radius;
        this.name = name;
    }
    void Circle(){
         System.out.println(this.radius);
    }
}