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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("矩形的周长是： "+s); } @Override public void area(double a, double b) { // TODO Auto-generated method stub double s=a*b; System.out.println("矩形的面积是： "+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("圆的周长是： "+s);}@Override public void area(double r) { // TODO Auto-generated method stub double s=3.13*r*r; System.out.println("圆的面积是： "+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);}} |
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