本届最后思考题中我的代码

package com.form;

//Shape图形类

public abstract class Shape {

double length;

double width;

double radius;

public abstract void perimeter();

public abstract void area();

}

package com.form;

//Rectangle子类

public class Rectangle extends Shape {

@Override

public void perimeter() {

// TODO Auto-generated method stub

System.out.println("长方形的周长为："+(length+width)*2);

}

@Override

public void area() {

// TODO Auto-generated method stub

System.out.println("长方形的面积为："+length*width);

}

}

package com.form;

//circle子类

public class Circle extends Shape {

@Override

public void perimeter() {

// TODO Auto-generated method stub

System.out.println("圆的周长为："+2*Math.PI*radius);

}

@Override

public void area() {

// TODO Auto-generated method stub

System.out.println("圆的面积为："+Math.PI*radius*radius);

}

}

package com.form;

import java.util.Scanner;

public class Instant {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner put=new Scanner(System.in);

Shape rectangle=new Rectangle();

System.out.print("请输入长方形的长：");

rectangle.length=put.nextDouble();

System.out.print("请输入长方形的宽：");

rectangle.width=put.nextDouble();

rectangle.perimeter();

rectangle.area();

Shape circle=new Circle();

System.out.print("请输入圆的半径：");

circle.radius=put.nextDouble();

circle.perimeter();

circle.area();

}

}