标签：print 注释 stat 返回 优化 and numbers lan lib
设计思想：
创建两个.java文件：
Arithmetic.java:
生成四则运算表达式并储存在ArrayList的对象中。
Result.java:
根据传进来的输入值计算结果，统计正确的个数，错误的个数，未做的个数。
三个.jsp文件：
Welcome.jsp:
欢迎界面，设置出题数，答题时间。跳转到operationResult.jsp界面
showExpression.jsp:
显示四则运算表达式，并输入结果,提交后跳转到operationResult.jsp界面
operationResult.jsp:
根据输入的答案显示出统计的信息。
源程序代码：
Arithmetic.java:
import java.util.ArrayList; public class Arithmetic { private static int []result; private static ArrayList<String> expressions; private static int numbers; private int x; private int y; public void setExpression(int numbers)//返回表达式 { this.numbers=numbers; String operator; result=new int[numbers]; expressions=new ArrayList<String>(); String expression=null; for(int i=0;i<numbers;i++) { int random=(int)(Math.random() * 4 + 1); x=(int)(Math.random() * 100 + 1); y=(int)(Math.random() * 100 + 1); switch(random) { case 1:{ operator="+"; optimizeResult(x,y,operator); result[i]=x+y; expression=x+operator+y+"="; expressions.add(expression); }break; case 2:{ operator="-"; optimizeResult(x,y,operator); result[i]=x-y; expression=x+operator+y+"="; expressions.add(expression); }break; case 3:{ operator="*"; optimizeResult(x,y,operator); result[i]=x*y; expression=x+operator+y+"="; expressions.add(expression); }break; case 4:{ operator="/"; optimizeResult(x,y,operator); optimizeDivision(x ,y); result[i]=x/y; expression=x+operator+y+"="; expressions.add(expression); }break; } } } public ArrayList<String> getExpression() { return expressions; } public int[] getResult() { return result; } public void optimizeDivision(int a,int b) { while(a%b!=0) { a=(int)(Math.random() * 100 + 1); b=(int)(Math.random() * 100 + 1); } x=a; y=b; } public void optimizeResult(int a,int b,String c) { int result=101; for(;result>100;){ a=(int)(Math.random() * 100 + 1); b=(int)(Math.random() * 100 + 1); switch(c) { case "+":result=a+b;break; case "-":result=a-b;break; case "*":result=a*b;break; case "/":result=a/b;break; } } x=a; y=b; } public int getNumbers() { return numbers; } public void reset() { numbers=0; result=null; expressions=null; } public boolean judgeErrorInput(String number) { boolean flag=false; if(number==null||"".equals(number)) { flag=true; return flag; } for(int i=0;i<number.length();i++) { if(!(number.charAt(i)>=48&&number.charAt(i)<=57)) { flag=true; break; } } return flag; } }
Result.java:
import java.util.ArrayList; public class Result { static ArrayList<String> resultSExpression=null; static ArrayList<String> resultSAnswer=null; String resultExpression; String resultAnswer; static int doRightNumbers=0; static int doWrongNumbers=0; static int unCompletedNumbers=0; public Result() { resultSExpression=new ArrayList<String>(); resultSAnswer=new ArrayList<String>(); } public void addResult(String expression,int rightResult,int inputResult) { if(rightResult==inputResult) { resultExpression=expression+inputResult; resultAnswer=" 正确"; doRightNumbers++; } else if(inputResult==-9999) { resultExpression=expression+" ？ "; resultAnswer="未做 (答案为"+rightResult+")"; unCompletedNumbers++; } else { resultExpression=expression+inputResult; resultAnswer=" 错误 (答案为"+rightResult+")"; doWrongNumbers++; } resultSExpression.add(resultExpression); resultSAnswer.add(resultAnswer); } public ArrayList<String> getResultSExpression() { return resultSExpression; } public ArrayList<String> getResultSAnswer() { return resultSAnswer; } public int getDoRightNumbers() { return doRightNumbers; } public int doWrongNumbers() { return doWrongNumbers; } public int getUnCompletedNumbers() { return unCompletedNumbers; } public void reset() { doRightNumbers=0; doWrongNumbers=0; unCompletedNumbers=0; } }
Welcome.jsp:
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body background="C:\Users\win8\workspace\四则运算Arithmetic\image\d602adc701a429f16a32aac5579f113e_7205982_162234868593_2.jpg"> <center> <font Face="楷体" color="white" size="6">欢迎进入四则运算小练习</font> </center> <form name="welcome" action="showExpression.jsp" method="post"> <br><br><br> <center style="color:white;font-family:楷体; font-size:20px"> 设置出题的数目 <input type="text" name="exercisesNumber" class="inputField"> <input type="submit" value="出题" style="color:green"> </center> </form> </body> </html>
showExpression.jsp:
<%@ page import ="java.util.ArrayList" language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body background="C:\Users\win8\workspace\四则运算Arithmetic\image\d602adc701a429f16a32aac5579f113e_7205982_162234868593_2.jpg"> <jsp:useBean id="arithmetic" class="util.Arithmetic" scope="application" /> <% String exercisesNumber=(String)request.getParameter("exercisesNumber"); int numbers=0; int i=0; ArrayList<String> expressionStorage=null; if(arithmetic.judgeErrorInput(exercisesNumber)) { out.print("<script language=‘javaScript‘> alert(‘输入错误‘);</script>"); response.setHeader("refresh", "0;url=welcome.jsp"); } else { numbers=Integer.parseInt(request.getParameter("exercisesNumber")); if(numbers<=0) { out.print("<script language=‘javaScript‘> alert(‘输入的题目数量不能为零‘);</script>"); response.setHeader("refresh", "0;url=welcome.jsp"); } else { numbers=Integer.parseInt(request.getParameter("exercisesNumber")); arithmetic.setExpression(numbers); expressionStorage=arithmetic.getExpression(); String result=""; %> <form name="" action="operationResult.jsp" method="post"> <table border="0"> <%for(String expression: expressionStorage) {%> <tr> <td style="color:white"><%=expression%> </td> <td><input type="text" placeholder="请输入答案" name=<%="result"+i++ %> ></td> </tr> <% } %> </table> <input type="submit" value="提交" style="color:green"> </form> </body> <%} %> <%} %> </html>
operationResult.jsp:
<%@page import="java.util.Enumeration"%> <%@page import="java.util.ArrayList"%> <%@page import="util.Result"%> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body background="C:\Users\win8\workspace\四则运算Arithmetic\image\d602adc701a429f16a32aac5579f113e_7205982_162234868593_2.jpg"> <jsp:useBean id="arithmetic" class="util.Arithmetic" scope="page" /> <% Result result=new Result(); int []receiveResult=new int[arithmetic.getNumbers()]; int []rightReuslt=arithmetic.getResult(); Enumeration<String> names=request.getParameterNames(); String input=null; for(int i=0;names.hasMoreElements();i++){ input=request.getParameter(names.nextElement()); if(input==null||"".equals(input)) receiveResult[i]=-9999; else receiveResult[i]= Integer.parseInt(input); } ArrayList<String> expressionStorage=arithmetic.getExpression(); for(int i=0;i<arithmetic.getNumbers();i++) { result.addResult(expressionStorage.get(i),rightReuslt[i],receiveResult[i]); } ArrayList<String> outResultExpression=result.getResultSExpression(); ArrayList<String> outResultAnswer=result.getResultSAnswer(); %> </body> 结果： <table> <%for(int i=0;i<arithmetic.getNumbers();i++){ %> <tr> <td><%= outResultExpression.get(i) %></td> <td><%= outResultAnswer.get(i) %></td> </tr> <%} %> </table> 做对的个数为：<%= result.getDoRightNumbers()%> <br> 做错的个数为：<%= result.doWrongNumbers()%> <br> 未完成的个数：<%= result.getUnCompletedNumbers() %> <% result.reset(); arithmetic.reset(); %> <form action="welcome.jsp"> <input type="submit" value="再次答题" style="color:green"> </form> </html>
运行结果截图：
开始界面
什么都不输入
输入负数
输入零
正常输入
编程结果总结分析：
1.一定要设计好程序的大概思路，这样写起来就是完成一个一个具体的功能模块了。
2.还要想清楚模块之间的衔接，如何传递想要的值。
3.把框架写好了，如果没写注释的话，要在主要地方补上注释，这样放几天后在拿起了完善功能时就很方便。
4.优化程序前最好要把原代码先粘在一个文本中，而我本次在完善非法输入判断时就直接删了，后来有一个小问题没注意到，一直报错，浪费了很多时间。
5.多看书，多看一些资料，就会发现其实有很多已经存在的可以直接使用的方法，这样会节省很多时间。
6.把所有的功能模块写在.java中，在jsp只调用那些方法即可。
时间记录日志：
学生:XXX 日期：2017.11.22
教师:XXX 课程：XXX
|
日期 |
开始时间 |
结束时间 |
中断时间 |
净时间 |
活动 |
备注 |
C |
U |
|
11.22 |
19:30
|
21:30 |
15 |
95 |
完成框架四则运算框架 |
作业 |
|
|
|
11.23 |
15:30 |
17:00 |
20 |
70 |
完善程序，可以输入答案并判断对错 |
作业 |
|
|
|
11.26 |
15:00 |
16:30 |
0 |
90 |
完善程序，可以统计判断对错及未输入的个数 |
作业 |
|
|
|
11.29 |
19:00 |
20:30 |
10 |
80 |
完善程序，优化输入答案界面及显示结果界面，并添加开始界面 |
作业 |
|
|
标签：print 注释 stat 返回 优化 and numbers lan lib
原文地址：http://www.cnblogs.com/ssyh/p/7993265.html
