java題目隨機(jī)代碼,java隨機(jī)抽題

求教大佬！java實(shí)現(xiàn)隨機(jī)出題

public class test {

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public static void main(String[] args) {

// java實(shí)現(xiàn)隨機(jī)出題

// 50以內(nèi)的加減乘除法，用戶解答后系統(tǒng)判斷對(duì)錯(cuò)，用戶輸入-1時(shí)中止訓(xùn)練

Scanner scan = new Scanner(System.in);

char[] arr = {'+','-','*','÷'};

while (true) {

// 生成一個(gè)隨機(jī)小數(shù)，范圍從 2.25 到 2.75的兩位小數(shù)

// double sum = Math.random()*(2.75-2.25)+2.25;

int a = (int) (Math.random()*(50-0)+0);

int b = (int) (Math.random()*(50-0)+0);

int f = (int) (Math.random()*(4-0)+0);

if (f== 1 a b) {

continue;

}

if (f== 3 a == 0) {

continue;

}

System.out.println("題目:"+a+arr[f]+b+"=\n請(qǐng)輸入:");

double sum = 0;

if (f == 0) {

sum = a+b;

}

if (f == 1) {

sum = a-b;

}

if (f == 2) {

sum = a*b;

}

if (f == 3) {

sum = 1.0*a/b;

}

double s = scan.nextDouble();

if (s == -1) {

System.err.println("結(jié)束");

break;

}

if (s == sum) {

System.err.println("正確");

}else {

System.err.println("錯(cuò)誤");

}

}

}

}

Java隨機(jī)數(shù)代碼怎么寫

Math.random()是令系統(tǒng)隨機(jī)選取大于等于 0.0 且小于 1.0 的偽隨機(jī) double 值，是Java語(yǔ)言常用代碼。

例如：var a:Number=Math.random()*2+1，設(shè)置一個(gè)隨機(jī)1到3的變量。

Java隨機(jī)抽取人名完整代碼是什么？

public class test {\x0d\x0a public static void main(String[] args) {\x0d\x0a //定義人名數(shù)組\x0d\x0a String [] name = {"張三","李四","王五","八神庵","不知火舞","大蛇","景天","唐雪見","李逍遙","趙靈兒"};\x0d\x0a//隨機(jī)生成數(shù)組下標(biāo)、\x0d\x0a int num = (int)(Math.random() * 1000);\x0d\x0a//對(duì)生成的隨機(jī)數(shù)進(jìn)行判斷，如果小于數(shù)組下標(biāo)，就跳出循環(huán)\x0d\x0awhile (numname.length-1) {\x0d\x0a if (num

回答于?2022-11-16

如何用Java實(shí)現(xiàn)隨機(jī)出題？

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("請(qǐng)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("請(qǐng)按照正常方式提交數(shù)據(jù)br");

printwriter.println("a href=/test/admin/genpaper.jsp單擊這里設(shè)置生成試卷的參數(shù)/a");

printwriter.println("/center");

}

total_paper_num = Integer.parseInt(s1);

curr_classid = s;

int i = 0;

if(!open_db(curr_classid))

{

printwriter.println("打開數(shù)據(jù)庫(kù)錯(cuò)誤！");

return;

}

if(!setParams(curr_classid))

{

System.out.println("設(shè)置系統(tǒng)參數(shù)錯(cuò)誤！");

return;

}

if(!verify_QuertionLib())

{

printwriter.println("試題庫(kù)中試卷不足，請(qǐng)?jiān)黾有碌脑囶}！");

printwriter.println("班級(jí)代號(hào)：" + curr_classid);

printwriter.println("該班級(jí)一套試卷中的試題數(shù)：" + total_question_in_paper);

printwriter.println("目前題庫(kù)中該班級(jí)的試題總數(shù)：" + total_question_num);

return;

}

i = genPaper(total_paper_num, curr_classid);

if(i == 0)

{

printwriter.println("生成試卷操作失??！");

return;

}

if(!updateOtherTable(i, curr_classid))

{

printwriter.println("更新相關(guān)表操作失??！");

return;

} else

{

printwriter.println("center");

printwriter.println("動(dòng)態(tài)組卷成功！br");

printwriter.println("共生成了 " + i + " 套試卷br");

printwriter.println("a href=/test/admin/genpaper.jsp單擊這里設(shè)置生成試卷的參數(shù)/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;

}

}

（java）題庫(kù)中有20道題，隨機(jī)抽10道不同的題出來 怎么寫代碼 在線等啊

import?java.util.*;

class?Untitled?{

public?static?void?main(String[]?args)?throws?Exception?{

Integer[]?questions?=?generateQuestions();

for(Integer?question?:?questions)?{

System.out.println(question);

}

}

private?static?Integer[]?generateQuestions()?{

ListInteger?questionNumbers?=?new?ArrayListInteger();

Random?rand?=?new?Random();

int?questionNumber,?i?=?0;

while(i??10)?{

questionNumber?=?rand.nextInt(21);

if(!questionNumbers.contains(questionNumber))?{

questionNumbers.add(questionNumber);

i?++;

}

}

return?questionNumbers.toArray(new?Integer[10]);

}

}

用java隨機(jī)出100道題

1、首先對(duì)這幾百道題逐一編號(hào)(假如有500道)。

2、用一個(gè)數(shù)組存放這些編號(hào)（從1-500）

3、用以下代碼

ListInteger noList = new ArrayListInteger();

//把500個(gè)編號(hào)放入noList中

for(int i=1; i=500; i++)

{

noList.add(i);

}

int inx = 100;

//存放被隨機(jī)選中的題目編號(hào)

ListInteger selectList = new ArrayListInteger();

while(inx0)

{

Random r = new Random();

int s = r.nextInt(noList.size());

selectList.add(noList.remove(s));

inx--；

}

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