diff --git a/MainApp.java b/MainApp.java
deleted file mode 100644
index 7370a35..0000000
--- a/MainApp.java
+++ /dev/null
@@ -1,196 +0,0 @@
-package com.studentmanagement;
-
-import com.studentmanagement.controller.StudentController;
-import com.studentmanagement.model.Student;
-import com.studentmanagement.view.StudentConsoleView;
-import com.studentmanagement.exception.StudentNotFoundException;
-import com.studentmanagement.exception.DuplicateStudentException;
-import com.studentmanagement.util.InputUtil;
-
-/**
- * 主应用程序类，系统入口点
- * 初始化MVC组件并启动用户界面
- */
-public class MainApp {
-    private StudentController controller;
-    private StudentConsoleView view;
-
-    /**
-     * 构造函数，初始化控制器和视图
-     */
-    public MainApp() {
-        this.controller = new StudentController();
-        this.view = new StudentConsoleView();
-    }
-
-    /**
-     * 启动应用程序
-     */
-    public void start() {
-        view.displayWelcome();
-        boolean running = true;
-
-        while (running) {
-            view.displayMenu();
-            int choice = InputUtil.getIntInput("", 0, 9);
-            view.displaySeparator();
-
-            switch (choice) {
-                case 1:
-                    displayAllStudents();
-                    break;
-                case 2:
-                    findStudentById();
-                    break;
-                case 3:
-                    addNewStudent();
-                    break;
-                case 4:
-                    updateStudent();
-                    break;
-                case 5:
-                    deleteStudent();
-                    break;
-                case 6:
-                    findStudentsByCourse();
-                    break;
-                case 7:
-                    findStudentsWithHighGrades();
-                    break;
-                case 8:
-                    showCourseAverageGrade();
-                    break;
-                case 9:
-                    showAverageAge();
-                    break;
-                case 0:
-                    running = false;
-                    view.displayExit();
-                    break;
-            }
-        }
-        InputUtil.close();
-    }
-
-    /**
-     * 显示所有学生
-     */
-    private void displayAllStudents() {
-        view.displayStudentList(controller.getAllStudents());
-    }
-
-    /**
-     * 根据ID查找学生
-     */
-    private void findStudentById() {
-        int id = InputUtil.getIntInput("请输入学生ID: ");
-        try {
-            Student student = controller.getStudentById(id);
-            view.displayStudent(student);
-        } catch (StudentNotFoundException e) {
-            view.displayErrorMessage(e.getMessage());
-        }
-    }
-
-    /**
-     * 添加新学生
-     */
-    private void addNewStudent() {
-        int id = InputUtil.getIntInput("请输入学生ID: ");
-        String name = InputUtil.getNonEmptyStringInput("请输入学生姓名: ");
-        int age = InputUtil.getIntInput("请输入学生年龄: ", 1, 100);
-        String course = InputUtil.getNonEmptyStringInput("请输入课程名称: ");
-        double grade = InputUtil.getDoubleInput("请输入成绩: ", 0, 100);
-
-        Student student = new Student(id, name, age, course, grade);
-        try {
-            controller.addStudent(student);
-            view.displaySuccessMessage("学生添加成功！");
-        } catch (DuplicateStudentException e) {
-            view.displayErrorMessage(e.getMessage());
-        }
-    }
-
-    /**
-     * 更新学生信息
-     */
-    private void updateStudent() {
-        int id = InputUtil.getIntInput("请输入要更新的学生ID: ");
-        try {
-            Student existingStudent = controller.getStudentById(id);
-            view.displayStudent(existingStudent);
-            
-            String name = InputUtil.getStringInput("请输入新姓名 (留空保持不变): ");
-            String course = InputUtil.getStringInput("请输入新课程 (留空保持不变): ");
-            
-            // 只有在用户输入了新值时才更新
-            if (name.isEmpty()) name = existingStudent.getName();
-            if (course.isEmpty()) course = existingStudent.getCourse();
-            
-            int age = InputUtil.getIntInput("请输入新年龄 (0保持不变): ", 0, 100);
-            if (age == 0) age = existingStudent.getAge();
-            
-            double grade = InputUtil.getDoubleInput("请输入新成绩 (-1保持不变): ", -1, 100);
-            if (grade == -1) grade = existingStudent.getGrade();
-            
-            Student updatedStudent = new Student(id, name, age, course, grade);
-            controller.updateStudent(updatedStudent);
-            view.displaySuccessMessage("学生信息更新成功！");
-        } catch (StudentNotFoundException e) {
-            view.displayErrorMessage(e.getMessage());
-        }
-    }
-
-    /**
-     * 删除学生
-     */
-    private void deleteStudent() {
-        int id = InputUtil.getIntInput("请输入要删除的学生ID: ");
-        try {
-            controller.deleteStudent(id);
-            view.displaySuccessMessage("学生删除成功！");
-        } catch (StudentNotFoundException e) {
-            view.displayErrorMessage(e.getMessage());
-        }
-    }
-
-    /**
-     * 根据课程查找学生
-     */
-    private void findStudentsByCourse() {
-        String course = InputUtil.getNonEmptyStringInput("请输入课程名称: ");
-        view.displayStudentList(controller.getStudentsByCourse(course));
-    }
-
-    /**
-     * 查找成绩优秀的学生
-     */
-    private void findStudentsWithHighGrades() {
-        view.displayStudentList(controller.getStudentsByGradeAbove(90));
-    }
-
-    /**
-     * 显示课程平均成绩
-     */
-    private void showCourseAverageGrade() {
-        String course = InputUtil.getNonEmptyStringInput("请输入课程名称: ");
-        double average = controller.calculateAverageGradeByCourse(course);
-        view.displayStatistics("课程《" + course + "》的平均成绩为: " + String.format("%.2f", average));
-    }
-
-    /**
-     * 显示学生平均年龄
-     */
-    private void showAverageAge() {
-        double averageAge = controller.calculateAverageAge();
-        view.displayStatistics("所有学生的平均年龄为: " + String.format("%.2f", averageAge));
-    }
-
-    /**
-     * 主方法，应用程序入口
-     */
-    public static void main(String[] args) {
-        MainApp app = new MainApp();
-        app.start();
-    }
-}
\ No newline at end of file