标签：style blog http io color ar os java for
Test.java
package package1; public class Test { double side1 = -1 , side2 = -1 , side3 = -1 , area = -1; boolean triangle; public double getSide1() { return side1; } public void setSide1(double side1) { this.side1 = side1; } public double getSide2() { return side2; } public void setSide2(double side2) { this.side2 = side2; } public double getSide3() { return side3; } public void setSide3(double side3) { this.side3 = side3; } public double getArea() { double p = (side1 + side2 + side3)/2.0; if(triangle) area = Math.sqrt( p * (p - side1) * (p - side2) * (p - side3) ); return area; } public void setArea(double area) { this.area = area; } public boolean isTriangle() { if(side1<side2+side3 && side2<side1+side3 && side3<side1+side2) triangle=true; else triangle=false; return triangle; } public void setTriangle(boolean triangle) { this.triangle = triangle; } }
triangle.jsp
<%@page contentType="text/html;charset=gb2312" pageEncoding="gb2312" %> <%@page import="package1.Test" %> <jsp:useBean id="tri" class="package1.Test" scope="page" /> <html> <head></head> <body> <form action="" method="post"> a:<input type="text" name="side1" value="0" /> b:<input type="text" name="side2" value="0" /> c:<input type="text" name="side3" value="0" /> <input type="submit" value="submit" /> </form> <jsp:setProperty name="tri" property="*" /> 三角形的三边是： 边a ：<jsp:getProperty name="tri" property="side1" /> 边b ：<jsp:getProperty name="tri" property="side2" /> 边c ：<jsp:getProperty name="tri" property="side3" /> <br /> 是否能组成三角形： <jsp:getProperty name="tri" property="triangle" /> <!-- 如果不先判断是否是triangle的话，servlet类中获得面积时的triangle判断恒为假，area输出结果值始终为-1 --> 面积是: <jsp:getProperty name="tri" property="area" /> </body> </html>
【jsp 练习】 给定三角形三边判断是否能组成三角形及计算面积
标签：style blog http io color ar os java for
原文地址：http://www.cnblogs.com/balfish/p/4075338.html
