MVC/MainApp.java

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);
    }
}