package com.imooc;

public abstract class Shape {

public abstract void zhouchang(double a,double b);

public abstract void zhouchang(double r);

public abstract void area(double a,double b);

public abstract void area(double r);

}

package com.imooc;

public class Rectangle extends Shape {

@Override

public void zhouchang(double a, double b) {

// TODO Auto-generated method stub

double s=2*(a+b);

System.out.println("矩形的周長是： "+s);

}

@Override

public void area(double a, double b) {

// TODO Auto-generated method stub

double s=a*b;

System.out.println("矩形的面積是： "+s);

}

}

package com.imooc;

public class Circle extends Shape {

@Override

public void zhouchang(double r) {

// TODO Auto-generated method stub

double s=2*3.14*r;

System.out.println("圓的周長是： "+s);

}

@Override

public void area(double r) {

// TODO Auto-generated method stub

double s=3.13*r*r;

System.out.println("圓的面積是： "+s);

}

}

package com.imooc;

public class Initial {

public static void main(String[] args) {

// TODO Auto-generated method stub

Rectangle rec=new Rectangle();

rec.zhouchang(3, 4);

rec.area(3, 4);

Circle cir=new Circle();

cir.zhouchang(3);

cir.area(3);

}

}