java 接口例题Shape.doc

1、 1.写一个形状接口 Shape有两个方法一个求周长，一个求面积2. 写一个长方形类 Rect 继承于形状类增加属性长和宽分别去覆盖求周长和求面积的方法3.写一个圆形类 Circle增加属性半径分别去覆盖求周长和求面积的方法写一个测试类，在测试类中分别创建不同的对象放入进一个 Shape数组中进行，循环数组中的元素求周长和面积interface Shapevoid Perimeter();/周长void Area();/面积/长方形class Rect implements Shapeprivate int length;private int wide;Overridepublic void

2、 Area() / TODO Auto-generated method stubSystem.out.println(“长方形长为：“ +this.length+“ 宽为：“+this.wide+“ 它的面积是：“+(this. length*this.wide);Overridepublic void Perimeter() / TODO Auto-generated method stubSystem.out.println(“长方形长为：“ +this.length+“ 宽为：“+this.wide+“ 它的周长是：“+( this.length*2)+(this.wide*2);pu

3、blic int getLength() return length;public void setLength(int length) this.length = length;public int getWide() return wide;public void setWide(int wide) this.wide = wide;public Rect(int length,int wide)setLength(length);setWide(wide);/圆class Circle implements Shapeprivate double radius;Overridepubli

4、c void Area() / TODO Auto-generated method stubSystem.out.println(“圆的半径为：“ +this.radius+“ 它的面积是：“+(3.14*this.radius*this.radius);Overridepublic void Perimeter() / TODO Auto-generated method stubSystem.out.println(“圆的半径为：“ +this.radius+“ 它的周长是：“+(2*3.14*this.radius);public double getRadius() return r

5、adius;public void setRadius(double radius) this.radius = radius;public Circle(double radius)setRadius(radius);public class Test1 public static void main(String args) / TODO Auto-generated method stubShape Shape=new Shape2;Rect a=new Rect(2,3);Circle b=new Circle(3);Shape0=a;Shape1=b;for(int i=0;i2;i+)Shapei.Perimeter();Shapei.Area();