package jsp;
public class Circle {
double side;
double area,perimeter;
public void setCircle(double r){
side=r;
}
public double getCircle(){
return side;
}
public double getArea(){
area=Math.sqrt(3.14*side*side);
return area;
}
public double gerPerimeter(){
perimeter=Math.sqrt(3.14*2*side);
return perimeter;
}
}
<%@ page language="java" import="java.util.*" pageEncoding="GB2312"%><%@ page import="jsp.Circle.*" %>
请输入圆的半径:
面积是:
周长是: