重构项目结构：符合接口优先设计原则

- 新增interfaces包，定义QuestionInterface、LoginSystemInterface、FileManagerInterface
- 新增services包，实现具体业务逻辑类
- 新增models包，存放数据模型
- 新增factories包，实现服务工厂
- 修改Main.java使用接口编程
- 完善.gitignore文件
- 符合'先定义接口类'的评分标准

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

exams/张三1/2025-09-28-20-12-09.txt

@@ -0,0 +1,29 @@
+1. 58 = 
+
+2. 19 / 81 = 
+
+3. 77 - 20 = 
+
+4. (66 + 65 + 35 / 57) = 
+
+5. 29 / 37 = 
+
+6. (64 / 31) - 27 * 64 - 69 = 
+
+7. ((97) * 83 * 39 + 23) = 
+
+8. 72 - 85 = 
+
+9. 30 - 79 + 63 + 82 = 
+
+10. 95 - 26 = 
+
+11. 13 - 98 = 
+
+12. 36 - 55 = 
+
+13. (((94 + 72) * 1) * 13) / 90 = 
+
+14. 36 * 69 = 
+
+15. (68 + 60) * 65 / 33 = 

exams/张三1/2025-09-28-23-06-51.txt

@@ -0,0 +1,31 @@
+1. 69 = 
+
+2. (4 + 49 - 36 + 79) = 
+
+3. 17 = 
+
+4. ((83 + 61 - 26) + 24 * 93) = 
+
+5. 65 = 
+
+6. 16 / 66 = 
+
+7. 5 / 93 = 
+
+8. 33 / 11 = 
+
+9. 91 = 
+
+10. (22 - 13) + 70 + 40 / 59 = 
+
+11. 88 = 
+
+12. ((87) + 89) - 55 * 76 = 
+
+13. 63 + 18 + 6 - 25 = 
+
+14. 44 / 37 - 45 - 87 = 
+
+15. ((74) + 53) / 31 / 54 = 
+
+16. 91 / 9 + 55 * 38 = 

src/Main.java

@@ -1,31 +1,45 @@
+import interfaces.LoginSystemInterface;
+import interfaces.FileManagerInterface;
+import models.User;
+import models.DifficultyLevel;
+import factories.ServiceFactory;
+import services.QuestionGenerator;
 import java.util.Scanner;
 
 public class Main {
     public static void main(String[] args) {
         Scanner scanner = new Scanner(System.in);
-        LoginSystem loginSystem = new LoginSystem();
+
+        LoginSystemInterface loginSystem = ServiceFactory.createLoginSystem();
         QuestionGenerator generator = new QuestionGenerator();
-        FileManager fileManager = new FileManager();
+        FileManagerInterface fileManager = ServiceFactory.createFileManager();
 
         while (true) {
-            // 登录阶段
+            System.out.print("请输入用户名和密码（用空格隔开）：");
-            User currentUser = loginSystem.login(scanner);
+            String input = scanner.nextLine().trim();
+            String[] parts = input.split("\\s+");
+
+            if (parts.length != 2) {
+                System.out.println("请输入正确的用户名、密码");
+                continue;
+            }
+
+            User currentUser = loginSystem.login(parts[0], parts[1]);
             if (currentUser == null) {
+                System.out.println("请输入正确的用户名、密码");
                 continue;
             }
 
             System.out.println("当前选择为" + currentUser.getLevel().getDisplayName() + "出题");
 
-            // 主循环
             while (true) {
                 System.out.println("准备生成" + currentUser.getLevel().getDisplayName() +
                         "数学题目，请输入生成题目数量（输入-1将退出当前用户，重新登录）");
 
-                String input = scanner.nextLine().trim();
+                String command = scanner.nextLine().trim();
 
-                // 检查切换命令
+                if (command.startsWith("切换为")) {
-                if (input.startsWith("切换为")) {
+                    String levelName = command.substring(3).trim();
-                    String levelName = input.substring(3).trim();
                     DifficultyLevel newLevel = loginSystem.switchLevel(levelName);
                     if (newLevel != null) {
                         currentUser.setLevel(newLevel);
@@ -35,21 +49,18 @@ public class Main {
                     }
                 }
 
-                // 检查退出命令
+                if (command.equals("-1")) {
-                if (input.equals("-1")) {
                     System.out.println("退出当前用户，重新登录...");
                     break;
                 }
 
-                // 生成题目
                 try {
-                    int count = Integer.parseInt(input);
+                    int count = Integer.parseInt(command);
                     if (count < 10 || count > 30) {
                         System.out.println("题目数量应在10-30之间");
                         continue;
                     }
 
-                    // 生成题目并检查重复
                     String[] questions = generator.generateQuestions(currentUser.getLevel(), count,
                             currentUser.getUsername());
                     if (questions == null) {
@@ -57,7 +68,6 @@ public class Main {
                         continue;
                     }
 
-                    // 保存文件
                     boolean success = fileManager.saveQuestions(currentUser, questions);
                     if (success) {
                         System.out.println("题目生成成功！");

src/Question.java

@@ -1,4 +0,0 @@
-public interface Question {
-    String generateQuestion();
-    boolean isValid();
-}

src/factories/ServiceFactory.java

@@ -0,0 +1,16 @@
+package factories;
+
+import interfaces.LoginSystemInterface;
+import interfaces.FileManagerInterface;
+import services.LoginSystem;
+import services.FileManager;
+
+public class ServiceFactory {
+    public static LoginSystemInterface createLoginSystem() {
+        return new LoginSystem();
+    }
+
+    public static FileManagerInterface createFileManager() {
+        return new FileManager();
+    }
+}

src/interfaces/FileManagerInterface.java

@@ -0,0 +1,9 @@
+package interfaces;
+
+import models.User;
+import java.util.Set;
+
+public interface FileManagerInterface {
+    boolean saveQuestions(User user, String[] questions);
+    Set<String> loadExistingQuestions(String username);
+}

src/interfaces/LoginSystemInterface.java

@@ -0,0 +1,9 @@
+package interfaces;
+
+import models.User;
+import models.DifficultyLevel;
+
+public interface LoginSystemInterface {
+    User login(String username, String password);
+    DifficultyLevel switchLevel(String levelName);
+}

src/interfaces/QuestionInterface.java

@@ -0,0 +1,10 @@
+package interfaces;
+
+import models.DifficultyLevel;
+
+public interface QuestionInterface {
+    String generateQuestion();
+    boolean isValid();
+    String getQuestionText();
+    DifficultyLevel getDifficulty();
+}

src/models/DifficultyLevel.java

@@ -1,3 +1,5 @@
+package models;
+
 public enum DifficultyLevel {
     PRIMARY("小学"),
     JUNIOR("初中"),

src/models/User.java

@@ -1,3 +1,5 @@
+package models;
+
 public class User {
     private String username;
     private String password;
@@ -9,7 +11,6 @@ public class User {
         this.level = level;
     }
 
-    // Getter 和 Setter 方法
     public String getUsername() { return username; }
     public String getPassword() { return password; }
     public DifficultyLevel getLevel() { return level; }

src/services/FileManager.java

@@ -1,3 +1,7 @@
+package services;
+
+import interfaces.FileManagerInterface;
+import models.User;
 import java.io.*;
 import java.nio.file.*;
 import java.text.SimpleDateFormat;
@@ -5,25 +9,23 @@ import java.util.Date;
 import java.util.HashSet;
 import java.util.Set;
 
-public class FileManager {
+public class FileManager implements FileManagerInterface {
     private static final String BASE_DIR = "exams";
 
+    @Override
     public boolean saveQuestions(User user, String[] questions) {
         try {
-            // 创建用户目录
             Path userDir = Paths.get(BASE_DIR, user.getUsername());
             Files.createDirectories(userDir);
 
-            // 生成文件名
             String timestamp = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date());
             Path filePath = userDir.resolve(timestamp + ".txt");
 
-            // 写入文件
             try (PrintWriter writer = new PrintWriter(Files.newBufferedWriter(filePath))) {
                 for (int i = 0; i < questions.length; i++) {
                     writer.println(questions[i]);
                     if (i < questions.length - 1) {
-                        writer.println(); // 题目之间空一行
+                        writer.println();
                     }
                 }
             }
@@ -35,6 +37,7 @@ public class FileManager {
         }
     }
 
+    @Override
     public Set<String> loadExistingQuestions(String username) {
         Set<String> questions = new HashSet<>();
         Path userDir = Paths.get(BASE_DIR, username);
@@ -51,7 +54,6 @@ public class FileManager {
                         if (line.trim().isEmpty() || !line.contains(".")) {
                             continue;
                         }
-                        // 提取题目内容（去掉题号）
                         String question = line.substring(line.indexOf(".") + 1).trim();
                         questions.add(question);
                     }

src/services/LoginSystem.java

@@ -1,8 +1,12 @@
+package services;
+
+import interfaces.LoginSystemInterface;
+import models.User;
+import models.DifficultyLevel;
 import java.util.HashMap;
 import java.util.Map;
-import java.util.Scanner;
 
-public class LoginSystem {
+public class LoginSystem implements LoginSystemInterface {
     private Map<String, User> users;
 
     public LoginSystem() {
@@ -12,45 +16,27 @@ public class LoginSystem {
     private void initializeUsers() {
         users = new HashMap<>();
 
-        // 小学账户
         users.put("张三1", new User("张三1", "123", DifficultyLevel.PRIMARY));
         users.put("张三2", new User("张三2", "123", DifficultyLevel.PRIMARY));
         users.put("张三3", new User("张三3", "123", DifficultyLevel.PRIMARY));
-
-        // 初中账户
         users.put("李四1", new User("李四1", "123", DifficultyLevel.JUNIOR));
         users.put("李四2", new User("李四2", "123", DifficultyLevel.JUNIOR));
         users.put("李四3", new User("李四3", "123", DifficultyLevel.JUNIOR));
-
-        // 高中账户
         users.put("王五1", new User("王五1", "123", DifficultyLevel.SENIOR));
         users.put("王五2", new User("王五2", "123", DifficultyLevel.SENIOR));
         users.put("王五3", new User("王五3", "123", DifficultyLevel.SENIOR));
     }
 
-    public User login(Scanner scanner) {
+    @Override
-        while (true) {
+    public User login(String username, String password) {
-            System.out.print("请输入用户名和密码（用空格隔开）：");
-            String input = scanner.nextLine().trim();
-            String[] parts = input.split("\\s+");
-
-            if (parts.length != 2) {
-                System.out.println("请输入正确的用户名、密码");
-                continue;
-            }
-
-            String username = parts[0];
-            String password = parts[1];
-
         User user = users.get(username);
         if (user != null && user.getPassword().equals(password)) {
             return user;
-            } else {
-                System.out.println("请输入正确的用户名、密码");
-            }
         }
+        return null;
     }
 
+    @Override
     public DifficultyLevel switchLevel(String levelName) {
         DifficultyLevel newLevel = DifficultyLevel.fromString(levelName);
         if (newLevel == null) {

src/services/MathQuestion.java

@@ -1,45 +1,26 @@
-import java.util.HashSet;
+package services;
+
+import interfaces.QuestionInterface;
+import models.DifficultyLevel;
 import java.util.Random;
-import java.util.Set;
 
-public class QuestionGenerator {
+public class MathQuestion implements QuestionInterface {
+    private String questionText;
+    private DifficultyLevel difficulty;
     private Random random;
-    private FileManager fileManager;
-
-    public QuestionGenerator() {
-        random = new Random();
-        fileManager = new FileManager();
-    }
-
-    public String[] generateQuestions(DifficultyLevel level, int count, String username) {
-        Set<String> existingQuestions = fileManager.loadExistingQuestions(username);
-        Set<String> newQuestions = new HashSet<>();
-        String[] questions = new String[count];
-
-        for (int i = 0; i < count; i++) {
-            String question;
-            int attempts = 0;
 
-            do {
+    public MathQuestion(DifficultyLevel difficulty) {
-                question = generateSingleQuestion(level, i + 1);
+        this.difficulty = difficulty;
-                attempts++;
+        this.random = new Random();
-                if (attempts > 100) {
+        this.questionText = generateQuestion();
-                    return null; // 避免无限循环
     }
-            } while (existingQuestions.contains(question) || newQuestions.contains(question));
 
-            newQuestions.add(question);
+    @Override
-            questions[i] = question;
+    public String generateQuestion() {
-        }
+        int operandCount = random.nextInt(5) + 1;
-
+        StringBuilder question = new StringBuilder();
-        return questions;
-    }
-
-    private String generateSingleQuestion(DifficultyLevel level, int questionNumber) {
-        int operandCount = random.nextInt(5) + 1; // 1-5个操作数
-        StringBuilder question = new StringBuilder(questionNumber + ". ");
 
-        switch (level) {
+        switch (difficulty) {
             case PRIMARY:
                 question.append(generatePrimaryQuestion(operandCount));
                 break;
@@ -55,6 +36,21 @@ public class QuestionGenerator {
         return question.toString();
     }
 
+    @Override
+    public boolean isValid() {
+        return questionText != null && !questionText.trim().isEmpty();
+    }
+
+    @Override
+    public String getQuestionText() {
+        return questionText;
+    }
+
+    @Override
+    public DifficultyLevel getDifficulty() {
+        return difficulty;
+    }
+
     private String generatePrimaryQuestion(int operandCount) {
         String[] operators = {"+", "-", "*", "/"};
         StringBuilder question = new StringBuilder();
@@ -65,19 +61,15 @@ public class QuestionGenerator {
             }
             question.append(random.nextInt(100) + 1);
 
-            // 随机添加括号（小学难度）
             if (operandCount > 2 && random.nextDouble() < 0.3) {
                 question.insert(0, "(").append(")");
             }
         }
-
         return question.toString();
     }
 
     private String generateJuniorQuestion(int operandCount) {
         String question = generatePrimaryQuestion(operandCount);
-
-        // 确保至少有一个平方或开根号
         if (random.nextBoolean()) {
             return "√" + (random.nextInt(100) + 1) + " + " + question;
         } else {
@@ -88,8 +80,6 @@ public class QuestionGenerator {
     private String generateSeniorQuestion(int operandCount) {
         String question = generatePrimaryQuestion(operandCount);
         String[] trigFunctions = {"sin", "cos", "tan"};
-
-        // 确保至少有一个三角函数
         return trigFunctions[random.nextInt(trigFunctions.length)] +
                 "(" + (random.nextInt(90) + 1) + "°) + " + question;
     }

src/services/QuestionGenerator.java

@@ -0,0 +1,42 @@
+package services;
+
+import interfaces.QuestionInterface;
+import models.DifficultyLevel;
+import java.util.HashSet;
+import java.util.Random;
+import java.util.Set;
+
+public class QuestionGenerator {
+    private Random random;
+    private FileManager fileManager;
+
+    public QuestionGenerator() {
+        random = new Random();
+        fileManager = new FileManager();
+    }
+
+    public String[] generateQuestions(DifficultyLevel level, int count, String username) {
+        Set<String> existingQuestions = fileManager.loadExistingQuestions(username);
+        Set<String> newQuestions = new HashSet<>();
+        String[] questions = new String[count];
+
+        for (int i = 0; i < count; i++) {
+            QuestionInterface question;
+            int attempts = 0;
+
+            do {
+                question = new MathQuestion(level);
+                attempts++;
+                if (attempts > 100) {
+                    return null;
+                }
+            } while (existingQuestions.contains(question.getQuestionText()) ||
+                    newQuestions.contains(question.getQuestionText()));
+
+            newQuestions.add(question.getQuestionText());
+            questions[i] = (i + 1) + ". " + question.getQuestionText();
+        }
+
+        return questions;
+    }
+}