ADD file via upload

src/ProblemManager.java

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+// problem.java
+import java.util.Scanner;
+import java.io.IOException;
+
+/**
+ * 问题管理类，处理用户交互和题目生成流程。
+ */
+public class ProblemManager {
+  private String currentLevel;
+  private String currentUserName;
+
+  public void display() {
+    try {
+      new ProcessBuilder("clear").inheritIO().start().waitFor();
+    } catch (IOException | InterruptedException exception) {
+      // 清屏失败，继续执行
+    }
+    System.out.println("=== 中小学数学卷子自动生成程序 ===");
+  }
+
+  public void start(User user) {
+    currentLevel = user.getLevel();
+    currentUserName = user.getUsername();
+
+    while (true) {
+      display();
+      System.out.println("欢迎你 " + user.getUsername() + " " + currentLevel);
+      System.out.println("输入1开始出题");
+      System.out.println("输入2切换出题年级");
+      System.out.println("输入-1退出登录，返回开始界面");
+
+      Scanner scanner = new Scanner(System.in);
+      int choice = 0;
+
+      while (true) {
+        String input = scanner.next();
+        try {
+          choice = Integer.parseInt(input);
+        } catch (NumberFormatException exception) {
+          choice = 0;
+        }
+        if (choice == 1 || choice == 2 || choice == -1) {
+          break;
+        } else {
+          System.out.println("请输入正确的操作");
+        }
+      }
+
+      if (choice == 1) {
+        if (generateProblems() == 0) {
+          continue;
+        }
+      }
+      if (choice == 2) {
+        if (switchLevel() == 0) {
+          continue;
+        }
+      }
+      if (choice == -1) {
+        break;
+      }
+    }
+  }
+
+  public int generateProblems() {
+    System.out.println("正在为" + currentLevel + "出题");
+    System.out.println("请在10-30的范围内输入出题数目，输入-1返回操作界面");
+
+    Scanner scanner = new Scanner(System.in);
+    int problemCount = 0;
+
+    while (true) {
+      String input = scanner.next();
+      try {
+        problemCount = Integer.parseInt(input);
+      } catch (NumberFormatException exception) {
+        problemCount = 0;
+      }
+      if (problemCount == -1) {
+        break;
+      }
+      if (problemCount >= 10 && problemCount <= 30) {
+        break;
+      } else {
+        System.out.println("请输入10-30范围的出题数");
+      }
+    }
+
+    if (problemCount == -1) {
+      return 0;
+    }
+
+    if (currentLevel.equals("小学")) {
+      PrimarySchoolProblemGenerator primaryGenerator = new PrimarySchoolProblemGenerator();
+      primaryGenerator.start(problemCount, currentUserName);
+    } else if (currentLevel.equals("初中")) {
+      MiddleSchoolProblemGenerator middleGenerator = new MiddleSchoolProblemGenerator();
+      middleGenerator.start(problemCount, currentUserName);
+    } else if (currentLevel.equals("高中")) {
+      HighSchoolProblemGenerator highGenerator = new HighSchoolProblemGenerator();
+      highGenerator.start(problemCount, currentUserName);
+    }
+
+    System.out.println("已出题完成,输入-1返回操作界面");
+    while (!scanner.next().equals("-1")) {
+      continue;
+    }
+    return 0;
+  }
+
+  public int switchLevel() {
+    System.out.println("请输入想要切换的出题年级,输入-1返回操作界面");
+
+    Scanner scanner = new Scanner(System.in);
+    String newLevel;
+
+    while (true) {
+      newLevel = scanner.next();
+      if (newLevel.equals("-1")) {
+        break;
+      }
+      if (newLevel.equals("初中") || newLevel.equals("小学") || newLevel.equals("高中")) {
+        break;
+      } else {
+        System.out.println("请输入小学、初中和高中三个选项中的一个");
+      }
+    }
+
+    if (newLevel.equals("-1")) {
+      return 0;
+    }
+
+    currentLevel = newLevel;
+    System.out.println("已成功修改出题年级为" + currentLevel + ",输入-1返回操作界面");
+
+    while (!scanner.next().equals("-1")) {
+      continue;
+    }
+    return 0;
+  }
+}