MVC/StudentConsoleView.java

package com.studentmanagement.view;

import com.studentmanagement.model.Student;

import java.util.List;
import java.util.Map;

/**
 * 学生控制台视图类
 * 实现StudentView接口，提供基于控制台的学生信息显示
 */
public class StudentConsoleView implements StudentView {

    @Override
    public void displayStudentList(List<Student> students) {
        System.out.println("\n===== 学生列表 =====");
        if (students.isEmpty()) {
            System.out.println("当前没有学生记录");
        } else {
            System.out.printf("%-10s %-10s %-5s %-5s %-10s\n", "学号", "姓名", "年龄", "性别", "平均成绩");
            System.out.println("------------------------------------------");
            for (Student student : students) {
                System.out.printf("%-10s %-10s %-5d %-5s %-10.2f\n",
                        student.getId(),
                        student.getName(),
                        student.getAge(),
                        student.getGender(),
                        student.calculateAverageGrade());
            }
        }
        displaySeparator();
    }

    @Override
    public void displayStudentDetails(Student student) {
        System.out.println("\n===== 学生详细信息 =====");
        System.out.println("学号: " + student.getId());
        System.out.println("姓名: " + student.getName());
        System.out.println("年龄: " + student.getAge());
        System.out.println("性别: " + student.getGender());
        System.out.println("课程成绩:");
        if (student.getCourseGrades().isEmpty()) {
            System.out.println("  暂无成绩记录");
        } else {
            for (Map.Entry<String, Double> entry : student.getCourseGrades().entrySet()) {
                System.out.printf("  %-10s: %.2f\n", entry.getKey(), entry.getValue());
            }
            System.out.println("平均成绩: " + String.format("%.2f", student.calculateAverageGrade()));
        }
        displaySeparator();
    }

    @Override
    public void displayFilteredStudents(List<Student> students, String filterCriteria) {
        System.out.println("\n===== 筛选结果 =====");
        System.out.println("筛选条件: " + filterCriteria);
        displayStudentList(students);
    }

    @Override
    public void displaySuccessMessage(String message) {
        System.out.println("[成功] " + message);
    }

    @Override
    public void displayErrorMessage(String message) {
        System.out.println("[错误] " + message);
    }

    @Override
    public void displayStatistics(String statistics) {
        System.out.println("\n===== 统计信息 =====");
        System.out.println(statistics);
        displaySeparator();
    }

    @Override
    public void displayMainMenu() {
        displaySeparator();
        System.out.println("学生管理系统");
        displaySeparator();
        System.out.println("1. 添加学生");
        System.out.println("2. 查看所有学生");
        System.out.println("3. 根据ID查找学生");
        System.out.println("4. 更新学生信息");
        System.out.println("5. 删除学生");
        System.out.println("6. 根据课程筛选学生");
        System.out.println("7. 根据成绩范围筛选学生");
        System.out.println("8. 计算课程平均成绩");
        System.out.println("9. 计算学生平均年龄");
        System.out.println(0 + ". 退出系统");
        displaySeparator();
        System.out.print("请选择操作: ");
    }

    /**
     * 显示分隔线
     */
    private void displaySeparator() {
        System.out.println("------------------------------------------");
    }

    /**
     * 显示等待提示
     */
    public void waitForEnter() {
        System.out.println("\n按Enter键继续...");
        try {
            System.in.read();
        } catch (Exception e) {
            // 忽略异常
        }
    }
}