ADD file via upload

MainApp.java

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+package com.studentmanagement;
+
+import com.studentmanagement.controller.StudentController;
+import com.studentmanagement.model.Student;
+import com.studentmanagement.util.InputUtil;
+import com.studentmanagement.view.StudentConsoleView;
+import com.studentmanagement.view.StudentView;
+
+/**
+ * 学生管理系统主应用类
+ * 应用程序的入口点，初始化MVC组件并启动系统
+ */
+public class MainApp {
+    public static void main(String[] args) {
+        // 初始化MVC组件
+        StudentView studentView = new StudentConsoleView();
+        StudentController studentController = new StudentController(studentView);
+        
+        // 启动应用
+        runApplication(studentController, (StudentConsoleView) studentView);
+    }
+
+    /**
+     * 运行应用程序主循环
+     * @param controller 学生控制器
+     * @param view 学生控制台视图
+     */
+    private static void runApplication(StudentController controller, StudentConsoleView view) {
+        boolean running = true;
+        
+        while (running) {
+            // 显示主菜单
+            view.displayMainMenu();
+            
+            // 获取用户选择
+            int choice = InputUtil.getIntInput("");
+            
+            // 根据选择执行相应操作
+            switch (choice) {
+                case 1:
+                    addStudent(controller);
+                    break;
+                case 2:
+                    controller.displayAllStudents();
+                    break;
+                case 3:
+                    findStudentById(controller);
+                    break;
+                case 4:
+                    updateStudent(controller);
+                    break;
+                case 5:
+                    deleteStudent(controller);
+                    break;
+                case 6:
+                    filterStudentsByCourse(controller);
+                    break;
+                case 7:
+                    filterStudentsByGradeRange(controller);
+                    break;
+                case 8:
+                    calculateAverageGradeByCourse(controller);
+                    break;
+                case 9:
+                    controller.calculateAverageAge();
+                    break;
+                case 0:
+                    running = false;
+                    System.out.println("\n感谢使用学生管理系统，再见！");
+                    break;
+                default:
+                    System.out.println("无效的选择，请重新输入");
+                    break;
+            }
+            
+            // 如果不是退出，等待用户确认继续
+            if (running && choice != 0) {
+                InputUtil.waitForEnter();
+            }
+        }
+    }
+
+    /**
+     * 添加学生
+     * @param controller 学生控制器
+     */
+    private static void addStudent(StudentController controller) {
+        String id = InputUtil.getStringInput("请输入学生ID: ");
+        String name = InputUtil.getStringInput("请输入学生姓名: ");
+        int age = InputUtil.getIntInput("请输入学生年龄: ");
+        String gender = InputUtil.getStringInput("请输入学生性别: ");
+        
+        Student student = new Student(id, name, age, gender);
+        
+        // 添加课程成绩
+        boolean addMoreCourses = true;
+        while (addMoreCourses) {
+            String course = InputUtil.getStringInput("请输入课程名称 (输入空字符串结束): ");
+            if (course.isEmpty()) {
+                addMoreCourses = false;
+            } else {
+                double grade = InputUtil.getDoubleInput("请输入该课程成绩: ");
+                student.addCourseGrade(course, grade);
+            }
+        }
+        
+        controller.addStudent(student);
+    }
+
+    /**
+     * 根据ID查找学生
+     * @param controller 学生控制器
+     */
+    private static void findStudentById(StudentController controller) {
+        String id = InputUtil.getStringInput("请输入要查找的学生ID: ");
+        controller.findStudentById(id);
+    }
+
+    /**
+     * 更新学生信息
+     * @param controller 学生控制器
+     */
+    private static void updateStudent(StudentController controller) {
+        String id = InputUtil.getStringInput("请输入要更新的学生ID: ");
+        
+        // 先查找学生是否存在
+        try {
+            // 这里我们直接创建一个新的学生对象来更新
+            String name = InputUtil.getStringInput("请输入新的学生姓名: ");
+            int age = InputUtil.getIntInput("请输入新的学生年龄: ");
+            String gender = InputUtil.getStringInput("请输入新的学生性别: ");
+            
+            Student updatedStudent = new Student(id, name, age, gender);
+            
+            // 添加课程成绩
+            boolean addCourses = InputUtil.getConfirmation("是否添加/更新课程成绩");
+            if (addCourses) {
+                boolean addMoreCourses = true;
+                while (addMoreCourses) {
+                    String course = InputUtil.getStringInput("请输入课程名称 (输入空字符串结束): ");
+                    if (course.isEmpty()) {
+                        addMoreCourses = false;
+                    } else {
+                        double grade = InputUtil.getDoubleInput("请输入该课程成绩: ");
+                        updatedStudent.addCourseGrade(course, grade);
+                    }
+                }
+            }
+            
+            controller.updateStudent(updatedStudent);
+        } catch (Exception e) {
+            System.out.println("更新失败: " + e.getMessage());
+        }
+    }
+
+    /**
+     * 删除学生
+     * @param controller 学生控制器
+     */
+    private static void deleteStudent(StudentController controller) {
+        String id = InputUtil.getStringInput("请输入要删除的学生ID: ");
+        if (InputUtil.getConfirmation("确定要删除该学生吗？")) {
+            controller.deleteStudent(id);
+        } else {
+            System.out.println("删除操作已取消");
+        }
+    }
+
+    /**
+     * 根据课程筛选学生
+     * @param controller 学生控制器
+     */
+    private static void filterStudentsByCourse(StudentController controller) {
+        String course = InputUtil.getStringInput("请输入课程名称: ");
+        controller.filterStudentsByCourse(course);
+    }
+
+    /**
+     * 根据成绩范围筛选学生
+     * @param controller 学生控制器
+     */
+    private static void filterStudentsByGradeRange(StudentController controller) {
+        double minGrade = InputUtil.getDoubleInput("请输入最低成绩: ");
+        double maxGrade = InputUtil.getDoubleInput("请输入最高成绩: ");
+        controller.filterStudentsByGradeRange(minGrade, maxGrade);
+    }
+
+    /**
+     * 计算课程平均成绩
+     * @param controller 学生控制器
+     */
+    private static void calculateAverageGradeByCourse(StudentController controller) {
+        String course = InputUtil.getStringInput("请输入课程名称: ");
+        controller.calculateAverageGradeByCourse(course);
+    }
+}