diff --git a/src/Main.java b/src/Main.java
index 3e59c38..326af45 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -1,5 +1,40 @@
+
+import util.*;
+
+import java.util.*;
+
 public class Main {
+    final private static Scanner scanner = new Scanner(System.in);
+
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+
+        menu Menu=new menu();
+        while (true) {
+            // 登录
+            System.out.println("1.登录");
+            System.out.println("2.退出");
+            System.out.println("3.修改密码");
+            System.out.println("4.创建账户");
+
+            int num=scanner.nextInt();
+             scanner.nextLine();
+            if(num==1){
+                Menu.Mymenu();
+            }
+            else if (num==2){
+            System.exit(0);
+            }
+            else if(num==3){
+                ModifyPassword.modimenu();
+            }
+            else if(num==4){
+            CreateUser.createuser();
+            }
+            else{
+                System.out.println("输出错误,请重新输入");
+            }
+        }
     }
-}
\ No newline at end of file
+
+
+}
diff --git a/src/auth/UserManager.java b/src/auth/UserManager.java
index ea0ffd0..dbac070 100644
--- a/src/auth/UserManager.java
+++ b/src/auth/UserManager.java
@@ -1,23 +1,19 @@
 package auth;
-
+import java.io.BufferedReader;
+import java.io.FileReader;
 import java.util.*;
-
+import java.io.IOException;
 public class UserManager {
     private List<User> users = new ArrayList<>();
-
+    public static int line_num= 0;
     public UserManager() {
-        // 小学
-        users.add(new User("张三1", "123", "小学"));
-        users.add(new User("张三2", "123", "小学"));
-        users.add(new User("张三3", "123", "小学"));
-        // 初中
-        users.add(new User("李四1", "123", "初中"));
-        users.add(new User("李四2", "123", "初中"));
-        users.add(new User("李四3", "123", "初中"));
-        // 高中
-        users.add(new User("王五1", "123", "高中"));
-        users.add(new User("王五2", "123", "高中"));
-        users.add(new User("王五3", "123", "高中"));
+        // 要读取的文件路径
+        String filePath = "user.txt";
+        // 调用方法读取文件并获取三个数据列表
+        DataLists dataLists = readDataFile(filePath);
+        for(int i=0;i<line_num;i++) {
+            users.add(new User(dataLists.list1.get(i), dataLists.list2.get(i), dataLists.list3.get(i)));
+        }
     }
 
     public User login(String username, String password) {
@@ -28,4 +24,54 @@ public class UserManager {
         }
         return null;
     }
+    static class DataLists {
+        List<String> list1;
+        List<String> list2;
+        List<String> list3;
+
+        DataLists(List<String> list1, List<String> list2, List<String> list3) {
+            this.list1 = list1;
+            this.list2 = list2;
+            this.list3 = list3;
+        }
+    }
+    public static DataLists readDataFile(String filePath) {
+        List<String> list1 = new ArrayList<>();// 创建三个列表分别存储每行的三个数据
+        List<String> list2 = new ArrayList<>();
+        List<String> list3 = new ArrayList<>();
+        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {// 使用try-with-resources语句确保资源自动关闭
+            String line;
+            int lineNumber = 1;
+            // 逐行读取
+            while ((line = br.readLine()) != null) {
+                // 去除首尾空格
+                line = line.trim();
+
+                // 跳过空行
+                if (line.isEmpty()) {
+                    continue;
+                }
+                // 分割行数据，这里假设使用空格分隔
+                // 如果是其他分隔符(如逗号、制表符)，请修改正则表达式
+                String[] parts = line.split("\\s+"); // 按一个或多个空格分割
+                // 检查是否有三个数据
+                if (parts.length != 3) {
+                    System.out.println("警告: 第" + lineNumber + "行数据格式不正确，需要3个数据，实际有" + parts.length + "个");
+                    lineNumber++;
+                    continue;
+                }
+                // 将三个数据分别添加到对应的列表
+                list1.add(parts[0]);
+                list2.add(parts[1]);
+                list3.add(parts[2]);
+                lineNumber++;
+            }
+            line_num=lineNumber-1;
+            return new DataLists(list1, list2, list3);
+        }catch (IOException e) {
+            System.out.println("读取文件时发生错误: " + e.getMessage());
+            e.printStackTrace();
+            return null;
+        }
+    }
 }
diff --git a/src/generator/HighGenerator.java b/src/generator/HighGenerator.java
new file mode 100644
index 0000000..a254d3a
--- /dev/null
+++ b/src/generator/HighGenerator.java
@@ -0,0 +1,15 @@
+package generator;
+
+import util.ExpressionUtils;
+import java.util.*;
+
+public class HighGenerator implements ProblemGenerator {
+    @Override
+    public List<String> generateProblems(int count) {
+        List<String> problems = new ArrayList<>();
+        for (int i = 1; i <= count; i++) {
+            problems.add(ExpressionUtils.generateHighExpr());
+        }
+        return problems;
+    }
+}
diff --git a/src/generator/MiddleGenerator.java b/src/generator/MiddleGenerator.java
new file mode 100644
index 0000000..fb0761c
--- /dev/null
+++ b/src/generator/MiddleGenerator.java
@@ -0,0 +1,15 @@
+package generator;
+
+import util.ExpressionUtils;
+import java.util.*;
+
+public class MiddleGenerator implements ProblemGenerator {
+    @Override
+    public List<String> generateProblems(int count) {
+        List<String> problems = new ArrayList<>();
+        for (int i = 1; i <= count; i++) {
+            problems.add(ExpressionUtils.generateMiddleExpr());
+        }
+        return problems;
+    }
+}
diff --git a/src/generator/Praimary.java b/src/generator/Praimary.java
deleted file mode 100644
index 03455ae..0000000
--- a/src/generator/Praimary.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package generator;
-
-public class Praimary {
-}
diff --git a/src/generator/PrimaryGenerator.java b/src/generator/PrimaryGenerator.java
new file mode 100644
index 0000000..0348ec3
--- /dev/null
+++ b/src/generator/PrimaryGenerator.java
@@ -0,0 +1,15 @@
+package generator;
+
+import util.ExpressionUtils;
+import java.util.*;
+
+public class PrimaryGenerator implements ProblemGenerator {
+    @Override
+    public List<String> generateProblems(int count) {
+        List<String> problems = new ArrayList<>(count);
+        for (int i = 1; i <= count; i++) {
+            problems.add( ExpressionUtils.generatePrimaryExpr());
+        }
+        return problems;
+    }
+}
diff --git a/src/generator/ProblemGenerator.java b/src/generator/ProblemGenerator.java
new file mode 100644
index 0000000..ad65cb1
--- /dev/null
+++ b/src/generator/ProblemGenerator.java
@@ -0,0 +1,8 @@
+package generator;
+
+import java.util.List;
+
+public interface ProblemGenerator {
+    List<String> generateProblems(int count);
+}
+
diff --git a/src/util/ExpressionUtils.java b/src/util/ExpressionUtils.java
new file mode 100644
index 0000000..9e1a0b9
--- /dev/null
+++ b/src/util/ExpressionUtils.java
@@ -0,0 +1,96 @@
+package util;
+
+import java.util.Random;
+
+public class ExpressionUtils {
+    private static Random rand = new Random();
+
+    // 随机操作符
+    private static final String[] OPS_PRIMARY = {"+", "-", "*", "/"};
+    private static final String[] OPS_MIDDLE = {"+", "-", "*", "/"};
+    private static final String[] OPS_HIGH = {"+", "-", "*", "/"};
+
+    // 生成一个随机整数 (1–100)
+    public static String randomNumber() {
+        return String.valueOf(rand.nextInt(100) + 1);
+    }
+
+    // 生成小学表达式
+    public static String generatePrimaryExpr() {
+        int operands = rand.nextInt(4) + 2; // 2–5 个操作数
+        StringBuilder expr = new StringBuilder();
+        for (int i = 0; i <operands; i++) {
+            if (i > 0) {
+                expr.append(" ").append(OPS_PRIMARY[rand.nextInt(OPS_PRIMARY.length)]).append(" ");
+            }
+            if (rand.nextBoolean() && operands > 1&& i!=operands-1) {
+                expr.append("(").append(randomNumber()).append(" ").append(OPS_PRIMARY[rand.nextInt(OPS_PRIMARY.length)])
+                        .append(" ").append(randomNumber()).append(")");
+                i++;
+            } else {
+                expr.append(randomNumber());
+            }
+        }
+        return expr.toString();
+    }
+
+    // 生成初中表达式（至少包含平方或开根号）
+    public static String generateMiddleExpr() {
+        int operands = rand.nextInt(5) + 1;
+        StringBuilder expr = new StringBuilder();
+        boolean hasSquareOrSqrt = false;
+
+        for (int i = 0; i <operands; i++) {
+            if (i > 0) {
+                expr.append(" ").append(OPS_MIDDLE[rand.nextInt(OPS_MIDDLE.length)]).append(" ");
+            }
+            int num = rand.nextInt(100) + 1;
+            if (!hasSquareOrSqrt && rand.nextBoolean()) {
+                if (rand.nextBoolean()) {
+                    expr.append("sqrt(").append(num).append(")");
+                } else {
+                    expr.append(num).append("^2");
+                }
+                hasSquareOrSqrt = true;
+
+            } else {
+                expr.append(num);
+            }
+        }
+
+        // 如果没加上，强制在最后补一个平方
+        if (!hasSquareOrSqrt) {
+            expr.append(" + ").append(rand.nextInt(50) + 1).append("^2");
+        }
+
+        return expr.toString();
+    }
+
+    // 生成高中表达式（至少包含 sin/cos/tan）
+    public static String generateHighExpr() {
+        int operands = rand.nextInt(5) + 1;
+        StringBuilder expr = new StringBuilder();
+        boolean hasTrig = false;
+
+        for (int i = 0; i <operands; i++) {
+            if (i > 0) {
+                expr.append(" ").append(OPS_HIGH[rand.nextInt(OPS_HIGH.length)]).append(" ");
+            }
+            int num = rand.nextInt(100) + 1;
+            if (!hasTrig && rand.nextBoolean()) {
+                String[] funcs = {"sin", "cos", "tan"};
+                expr.append(funcs[rand.nextInt(funcs.length)]).append("(").append(num).append(")");
+                hasTrig = true;
+            } else {
+                expr.append(num);
+            }
+        }
+
+        // 如果没加三角函数，强制补一个
+        if (!hasTrig) {
+            expr.append(" + sin(").append(rand.nextInt(90) + 1).append(")");
+        }
+
+        return expr.toString();
+    }
+}
diff --git a/src/util/FileUtils.java b/src/util/FileUtils.java
new file mode 100644
index 0000000..f5f2e06
--- /dev/null
+++ b/src/util/FileUtils.java
@@ -0,0 +1,63 @@
+package util;
+
+import java.io.*;
+import java.nio.file.*;
+import java.text.SimpleDateFormat;
+import java.util.*;
+
+public class FileUtils {
+
+    // 获取用户文件夹路径
+    public static String getUserFolder(String username) {
+        String folder = "exams/" + username; // 存放在项目目录下 exams/
+        File dir = new File(folder);
+        if (!dir.exists()) {
+            dir.mkdirs();
+        }
+        return folder;
+    }
+
+    // 读取历史题目（用于查重）
+    public static Set<String> loadHistory(String username) {
+        Set<String> history = new HashSet<>();
+        String folder = getUserFolder(username);
+
+        File dir = new File(folder);
+        File[] files = dir.listFiles((d, name) -> name.endsWith(".txt"));
+        if (files != null) {
+            for (File file : files) {
+                try (BufferedReader br = new BufferedReader(new FileReader(file))) {
+                    String line;
+                    while ((line = br.readLine()) != null) {
+                        if (!line.trim().isEmpty()) {
+                            history.add(line.trim());
+                        }
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return history;
+    }
+
+    // 保存新题目
+    public static void saveProblems(String username, List<String> problems) {
+        String folder = getUserFolder(username);
+        String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
+        String filename = folder + "/" + timestamp + ".txt";
+
+        try (BufferedWriter bw = new BufferedWriter(new FileWriter(filename))) {
+            int index=1;
+            for (String problem : problems) {
+                bw.write(index+"."+problem);
+                bw.newLine();
+                bw.newLine();
+                index++;
+            }
+            System.out.println("卷子已保存到: " + filename);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/src/util/ModifyClass.java b/src/util/ModifyClass.java
new file mode 100644
index 0000000..2204ca5
--- /dev/null
+++ b/src/util/ModifyClass.java
@@ -0,0 +1,54 @@
+package util;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ModifyClass {
+
+    /**
+     * 查找目标名字所在行，并替换该行的第三个字符串
+     * @param filePath 文件路径
+     * @param targetName 要查找的名字（每行第一个字符串）
+     * @param newThirdString 新的第三个字符串
+     * @return 找到并替换的行号，未找到返回-1
+     */
+    public static int modifyclass(String filePath, String targetName, String newThirdString) {
+        List<String> lines = new ArrayList<>();
+        int targetLineNumber = -1;
+
+        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                lines.add(line);
+                if (line.trim().isEmpty()) continue;
+                String[] parts = line.trim().split("\\s+");
+                if (parts.length > 0 && parts[0].equals(targetName)) {
+                    targetLineNumber = lines.size();
+                }
+            }
+        } catch (IOException e) {
+            System.err.println("读取文件错误: " + e.getMessage());
+            return -1;
+        }
+
+        if (targetLineNumber != -1) {
+            int index = targetLineNumber - 1;
+            String[] parts = lines.get(index).trim().split("\\s+");
+            if (parts.length >= 3) {
+                parts[2] = newThirdString;
+                lines.set(index, String.join(" ", parts));
+                try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
+                    for (String l : lines) writer.write(l + System.lineSeparator());
+                } catch (IOException e) {
+                    System.err.println("写入文件错误: " + e.getMessage());
+                    return -1;
+                }
+            } else {
+                System.out.println("第 " + targetLineNumber + " 行元素不足3个");
+            }
+        }
+        return targetLineNumber;
+    }
+
+}
diff --git a/src/util/menu.java b/src/util/menu.java
new file mode 100644
index 0000000..c15d096
--- /dev/null
+++ b/src/util/menu.java
@@ -0,0 +1,133 @@
+package util;
+import auth.*;
+import generator.*;
+
+import java.util.*;
+
+import static util.ModifyClass.modifyclass;
+
+public class menu {
+     static Scanner scanner = new Scanner(System.in);
+    User currentUser = null;
+    ProblemGenerator generator = null;
+
+    public void Mymenu() {
+        while (currentUser==null) {
+
+            System.out.println("请输入用户名和密码（用空格隔开）：");
+            String input = scanner.nextLine();
+            String [] parts=input.split(" ");
+            if (parts.length != 2) {
+                System.out.println("格式错误，请重新输入。");
+                continue;
+            }
+            String username = parts[0];
+            String password = parts[1];
+            UserManager userManager = new UserManager();
+            currentUser = userManager.login(username, password);
+            if (currentUser == null) {
+                System.out.println("请输入正确的用户名、密码");
+            } else {
+                System.out.println("当前选择为 " + currentUser.getType() + " 出题");
+                int tmp = menu1(currentUser, generator);
+                if(tmp == 1) {
+                    currentUser = null;
+                    generator=null;
+                    break;
+                }
+            }
+        }
+    }
+
+    public static int menu1(User currentUser, ProblemGenerator generator) {
+        int count1 = 0;
+        while (true) {
+            System.out.println("1.生成试卷");
+            System.out.println("2.修改难度");
+            System.out.println("3.退出当前登录");
+
+            int choice = scanner.nextInt();
+            scanner.nextLine();
+            if (choice == 1) {
+               int temp= generateExam(currentUser);
+               if(temp== 1) {
+                   count1=1;
+                   break;
+               }
+
+            } else if (choice == 2) {
+                currentUser = switchDifficulty(currentUser);
+            } else if (choice == 3) {
+                //count=1代表currentuser要退出
+                count1 = 1;
+                break; // 退出
+            }
+            else{
+                System.out.println("输出错误,请重新输入");
+            }
+        }
+        return count1;
+    }
+
+    private static int generateExam(User currentUser) {
+        System.out.println("准备生成 " + currentUser.getType() +
+                " 数学题目，请输入生成题目数量（输入 -1 退出当前用户）：");
+        ProblemGenerator generator = getGenerator(currentUser.getType());
+        int count = scanner.nextInt();
+        scanner.nextLine();
+        if (count == -1){
+            System.out.println("退出成功");
+            return 1;
+        }
+        if (count < 10 || count > 30) {
+            System.out.println("题目数量必须在 10 到 30 之间");
+            return 2;
+        }
+
+        Set<String> history = FileUtils.loadHistory(currentUser.getUsername());
+        List<String> problems = new ArrayList<>();
+        while (problems.size() < count) {
+            List<String> batch = generator.generateProblems(1);
+            String problem = batch.get(0);
+            if (!history.contains(problem)) {
+                problems.add(problem);
+                history.add(problem);
+            }
+        }
+        for (int i = 0; i <count; i++) {
+            String p = problems.get(i);
+            System.out.println((i+1)+"."+p);
+        }
+
+        FileUtils.saveProblems(currentUser.getUsername(), problems);
+        return 0;
+    }
+
+    private static User switchDifficulty(User currentUser) {
+        System.out.println("正在修改难度中，请输入 切换为小学/初中/高中");
+        String input1 = scanner.next();
+        if (input1.startsWith("切换为")) {
+            String target = input1.replace("切换为", "").trim();
+            if (target.equals("小学") || target.equals("初中") || target.equals("高中")) {
+                currentUser = new User(currentUser.getUsername(),
+                        currentUser.getPassword(), target);
+                modifyclass("user.txt", currentUser.getUsername(), target);
+                System.out.println("系统提示：修改难度完成。难度为 " + target + " 难度");
+            } else {
+                System.out.println("请输入小学、初中和高中三个选项中的一个");
+            }
+        } else {
+            System.out.println("输入错误请重试");
+        }
+        return currentUser;
+    }
+
+    public static ProblemGenerator getGenerator(String type) {
+        switch (type) {
+            case "小学": return new PrimaryGenerator();
+            case "初中": return new MiddleGenerator();
+            case "高中": return new HighGenerator();
+            default: return null;
+        }
+    }
+}