用加减乘除算法随机出题java源代码

import java.io.*;

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import java.sql.*;

import javax.servlet.*;

import javax.servlet.http.*;

import oracle.jdbc.driver.OracleDriver;

public class GenPaperServlet extends HttpServlet

{

Connection conn;

Statement stmt;

ResultSet rs;

int total_question_num;

int total_question_in_paper;

int total_paper_num;

String curr_classid;

public GenPaperServlet()

{

conn = null;

stmt = null;

rs = null;

total_question_num = 0;

total_question_in_paper = 0;

total_paper_num = 0;

curr_classid = "";

}

public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)

throws ServletException, IOException

{

httpservletresponse.setContentType("text/html;charset=GBK");

PrintWriter printwriter = httpservletresponse.getWriter();

printwriter.println("htmlhead/headbodycenter");

printwriter.println("请以POST方式提交");

printwriter.println("/center/body/html");

printwriter.close();

用JAVA编写一个程序 要求实现功能：随机生成十道口算题

应该有规定是多少范围内整数吧 还有就是加减乘除吧 随机就用math.random()乘范围出数 然后取整 加减乘数也用随机数switch判断1234分别是加减乘除 倒数用timer和timertask类实现 那个手机的得响应一个向下获取焦点事件 类似的onKeyReleaseDown吧 下一个组件.setFocus 提交就是onSubmit事件 处理action或直接跳到ftl或者jsp上处理 传入结果参数程序分别判断下正确个数 然后显示就行了 正确率乘5就是分数

Java编写一个能够自动生成小朋友算术练习题目的程序。设计一个程序，要求能够随机生成每个题目。

package com.demo;

import java.math.BigDecimal;

import java.util.Random;

import java.util.Scanner;

/*

* Java编写一个能够自动生成小朋友算术练习题目的程序。设计一个程序，要求能够随机生成每个题目。

* 编写一个能够自动生成小朋友算术练习题目的程序。设计一个程序，要求能够随机生成每个题目，并具有以下基本功能：

* （1）要求题目以单项选择题及填空题两种形式出现。

* （2）完成一题后自动判断答案是否正确，分别弹出不同的提示，并自动更新成下一题。

* （3）单击“退出”时，汇总本次计算结果，共完成几题，正确率，并给出相应评语。确定后正式退出。

*/

public class publicDemo2 {

public static void main(String[] args) {

Random random = new Random();

StringBuilder stringBuilder = new StringBuilder();

String[] symbol = {"+","-","*","/"};

String question_tip = "选择题(除法保留小数点后两位)：";

stringBuilder.append(question_tip).append("\n");

System.out.println(question_tip);

int a;

int b;

String f;

String result_str;

for (int i=1;i11;i++){

a = random.nextInt(50);

b = random.nextInt(50);

f = symbol[random.nextInt(3)];

String question = i+"、"+a+f+b+"=";

System.out.println(question);

stringBuilder.append(question);

Scanner sc = new Scanner(System.in);

String sc_str = sc.next();

if("/".equals(f)){

double scan_value = Double.parseDouble(sc_str);

double result_value = a / b;

BigDecimal bigDecimal1 = new BigDecimal(scan_value);

scan_value = bigDecimal1.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();

BigDecimal bigDecimal2 = new BigDecimal(result_value);

result_value = bigDecimal2.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();

result_str = (scan_value==result_value)?"回答正确！":"回答错误！";

stringBuilder.append(scan_value).append(";(答案："+result_value+")"+result_str).append("\n");

}else{

int scan_value = Integer.parseInt(sc_str);

int result_value;

if("+".equals(f)){

result_value = a + b;

}else if("-".equals(f)){

result_value = a - b;

}else if("*".equals(f)){

result_value = a * b;

}else{

break;

}

result_str = (scan_value==result_value)?"回答正确！":"回答错误！";

stringBuilder.append(scan_value).append(";(答案："+result_value+")"+result_str).append("\n");

}

}

System.out.println(stringBuilder.toString());

}

}

如何用Java实现随机出题？

import java.io.*;

import java.sql.*;

import javax.servlet.*;

import javax.servlet.http.*;

import oracle.jdbc.driver.OracleDriver;

public class GenPaperServlet extends HttpServlet

{

Connection conn;

Statement stmt;

ResultSet rs;

int total_question_num;

int total_question_in_paper;

int total_paper_num;

String curr_classid;

public GenPaperServlet()

{

conn = null;

stmt = null;

rs = null;

total_question_num = 0;

total_question_in_paper = 0;

total_paper_num = 0;

curr_classid = "";

}

public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)

throws ServletException, IOException

{

httpservletresponse.setContentType("text/html;charset=GBK");

PrintWriter printwriter = httpservletresponse.getWriter();

printwriter.println("htmlhead/headbodycenter");

printwriter.println("请以POST方式提交");

printwriter.println("/center/body/html");

printwriter.close();

}

public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse)

throws ServletException, IOException

{

httpservletresponse.setContentType("text/html;charset=GBK");

PrintWriter printwriter = httpservletresponse.getWriter();

String s = httpservletrequest.getParameter("classid"); //"20"

String s1 = httpservletrequest.getParameter("paper_num"); //"1"

if(s == null || s1 == null)

{

printwriter.println("center");

printwriter.println("请按照正常方式提交数据br");

printwriter.println("a href=/test/admin/genpaper.jsp单击这里设置生成试卷的参数/a");

printwriter.println("/center");

}

total_paper_num = Integer.parseInt(s1);

curr_classid = s;

int i = 0;

if(!open_db(curr_classid))

{

printwriter.println("打开数据库错误！");

return;

}

if(!setParams(curr_classid))

{

System.out.println("设置系统参数错误！");

return;

}

if(!verify_QuertionLib())

{

printwriter.println("试题库中试卷不足，请增加新的试题！");

printwriter.println("班级代号：" + curr_classid);

printwriter.println("该班级一套试卷中的试题数：" + total_question_in_paper);

printwriter.println("目前题库中该班级的试题总数：" + total_question_num);

return;

}

i = genPaper(total_paper_num, curr_classid);

if(i == 0)

{

printwriter.println("生成试卷操作失败！");

return;

}

if(!updateOtherTable(i, curr_classid))

{

printwriter.println("更新相关表操作失败！");

return;

} else

{

printwriter.println("center");

printwriter.println("动态组卷成功！br");

printwriter.println("共生成了 " + i + " 套试卷br");

printwriter.println("a href=/test/admin/genpaper.jsp单击这里设置生成试卷的参数/a");

printwriter.println("/center");

return;

}

}

public boolean open_db(String s)

{

try

{

new OracleDriver();

conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ora9", "scott", "tiger");

stmt = conn.createStatement();

}

catch(Exception exception)

{

return false;

}

return true;

}

public boolean setParams(String s)

{

String s1 = "";

try

{

String s2 = "select count(questionid) as countquestionid from test_question_lib ";

s2 = s2 + "where classid='" + s + "'";

rs = stmt.executeQuery(s2);

rs.next();

total_question_num = rs.getInt("countquestionid");

s2 = "select totalques from test_classinfo ";

s2 = s2 + "where classid='" + s + "'";

rs = stmt.executeQuery(s2);

rs.next();

total_question_in_paper = rs.getInt("totalques");

}

catch(Exception exception)

{

return false;

}

return true;

}

public boolean verify_QuertionLib()

{

return total_question_num = total_question_in_paper;

}

public boolean updateOtherTable(int i, String s)

{

int j = 0;

String s1 = "update test_classinfo set totalpaper=totalpaper+";

s1 = s1 + i + " where classid='" + s + "'";

try

{

j = stmt.executeUpdate(s1);

}

catch(Exception exception)

{

return false;

}

return j == 1;

}

public int genPaper(int i, String s)

{

boolean flag = false;

boolean flag1 = false;

boolean flag2 = false;

boolean flag3 = false;

String s1 = "";

try

{

int ai[] = new int[total_question_num];

int i1 = 0;

boolean flag4 = false;

String s2 = "select max(paper_id) as max_paper_id from test_paper_lib";

rs = stmt.executeQuery(s2);

rs.next();

int j = rs.getInt("max_paper_id") + 1;

s2 = "select questionid from test_question_lib where classid='" + s + "'";

for(rs = stmt.executeQuery(s2); rs.next();)

ai[i1++] = rs.getInt("questionid");

for(int k1 = 0; k1 i; k1++)

{

int k = ai.length; //8

for(int l1 = 0; l1 total_question_in_paper; l1++)

{

// int ai[] ={1 ,3 , 5 ,9 , 56,30 96 ,25};

int j1 = (int)Math.floor(Math.random() * (double)k); // 4

String s3 = "insert into test_paper_lib values(";

s3 = s3 + "test_seq_paper.nextval," + j + "," + ai[j1] + ")";

stmt.executeUpdate(s3);

int l = ai[k - 1];

ai[k - 1] = ai[j1];

ai[j1] = l;

k--;

}

j++;

}

}

catch(Exception exception)

{

return 0;

}

return i;

}

}