java.txt

分别定义图形类Shape（抽象基类）

import javax.swing.JOptionPane; 
class Rectangle extends Shape 
{ 
public double zhouchang(double c,double k) 
{ 
return (c + k)  2; 
} 

public double mianji(double c,double k) 
{ 
return c  k; 
} 
} 


class Square extends Shape 
{ 

public double zhouchang(double c,double k) 
{ 
return (c + k)  2; 
} 

public double mianji(double c,double k) 
{ 
return c  k; 
} 
} 

class Circle extends Shape 
{ 

public double zhouchang(double y,double P) 
{ 
return P  y  2; 
} 

public double mianji(double y,double P) 
{ 
return P  y  P  y; 
} 
} 
abstract class Shape 
{ 

public abstract double zhouchang(double x,double y); 

public abstract double mianji(double x,double y); 

} 


public class Wb5 
{ 
public static void main(String[] dafdasdf) 
{ 
final double P = 3.14; 
System.out.println(输入长); 
double c = Integer.parseInt(JOptionPane.showInputDialog(null, Enter Number)); 
System.out.println(输入宽); 
double k = Integer.parseInt(JOptionPane.showInputDialog(null, Enter Number)); 
System.out.println(输入输入半径); 
double y = Integer.parseInt(JOptionPane.showInputDialog(null, Enter Number)); 


Rectangle a = new Rectangle(); 
double cf = a.zhouchang(c,k); 

double cf1 = a.mianji(c,k); 

System.out.println(长方形的周长为+cf); 
System.out.println(长方形的面积为+cf1); 


Square b = new Square(); 
double zf = b.zhouchang(c,k); 

double zf1 = b.mianji(c,k); 

System.out.println(正方形的周长为+zf); 
System.out.println(正方形的面积为+zf1); 



Circle d = new Circle(); 
double yy = d.zhouchang(y,P); 

double yy1 = d.mianji(y,P); 

System.out.println(圆形的周长为+yy); 
System.out.println(圆形的面积为+yy1); 


} 
}