作业分享，一起学习。

package com.imooc;

public abstract class Shape {

public abstract double ZhouChang();

public abstract double MianJi();

}

package com.imooc;

public class Rectangle extends Shape {

static int Chang;

static int Kuan;

@Override

public double ZhouChang() {

// TODO Auto-generated method stub

return (Chang + Kuan) * 2;

}

@Override

public double MianJi() {

// TODO Auto-generated method stub

return Chang * Kuan;

}

}

package com.imooc;

public class Circle extends Shape {

static int r;

@Override

public double ZhouChang() {

// TODO Auto-generated method stub

return 2*Math.PI*r;

}

@Override

public double MianJi() {

// TODO Auto-generated method stub

return Math.PI*r*r;

}

}

package com.imooc;

import java.util.Scanner;

public class Test2 {

@SuppressWarnings("resource")

public static void main(String[] args) {

Shape r1=new Rectangle();

Scanner s = new Scanner(System.in);

System.out.println("请分别输入长方形的长和宽：");

Rectangle.Chang = s.nextInt();

Rectangle.Kuan=s.nextInt();

System.out.println("长方形周长为： "+r1.ZhouChang());

System.out.println("长方形面积为： "+r1.MianJi());

Shape r2=new Circle();

System.out.println("请输入圆的半径");

Circle.r=s.nextInt();

System.out.println("圆的周长是："+r2.ZhouChang());

System.out.println("圆的面积是："+r2.MianJi());

}

}