package Shape;

public abstract class Shape {

? public abstract void mianji();

? public abstract void zhouchang();

}

package Shape;

import java.util.Scanner;

public class Rectangle extends Shape {

Scanner in=new Scanner(System.in);

? ? int windth=in.nextInt();

? ? int length=in.nextInt();

@Override

public void mianji() {

// TODO Auto-generated method stub

? ? System.out.println("矩形的面積為："+windth*length);

}

@Override

public void zhouchang() {

// TODO Auto-generated method stub

System.out.println("矩形的周長為："+(windth+length)*2);

}

}

package Shape;

import java.util.Scanner;

public class Circle extends Shape {

Scanner in=new Scanner(System.in);

? ? double Radius=in.nextDouble();

? ??

@Override

public void mianji() {

// TODO Auto-generated method stub

System.out.println("圓的面積為："+Math.PI*Radius*Radius);

}

@Override

public void zhouchang() {

// TODO Auto-generated method stub

System.out.println("圓的面積為："+2*Math.PI*Radius);

}

}

package Shape;

public class Test {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

? ?System.out.println("請輸入寬和高：");

? ?Shape juxing=new Rectangle();

? ?juxing.mianji();

? ?juxing.zhouchang();

? ?System.out.println("請輸入半徑：");

? ?Shape yuan=new Circle();

? ?yuan.mianji();

? ?yuan.zhouchang();

? }

}