第三周 七月九日

开始尝试写最基础的学生管理系统

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Student {
    private String name;
    private int age;
    private String grade;

    public Student(String name, int age, String grade) {
        this.name = name;
        this.age = age;
        this.grade = grade;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public String getGrade() {
        return grade;
    }
}

class StudentManagementSystem {
    private List<Student> students;

    public StudentManagementSystem() {
        students = new ArrayList<>();
    }

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(String name) {
        students.removeIf(s -> s.getName().equals(name));
    }

    public List<Student> getStudents() {
        return students;
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StudentManagementSystem sms = new StudentManagementSystem();

        while (true) {
            System.out.println("学生管理系统");
            System.out.println("1. 添加学生");
            System.out.println("2. 删除学生");
            System.out.println("3. 显示所有学生");
            System.out.println("4. 退出系统");
            System.out.print("请输入选项: ");
            int option = scanner.nextInt();
            scanner.nextLine();

            if (option == 1) {
                System.out.print("请输入学生姓名: ");
                String name = scanner.nextLine();
                System.out.print("请输入学生年龄: ");
                int age = scanner.nextInt();
                scanner.nextLine();
                System.out.print("请输入学生年级: ");
                String grade = scanner.nextLine();

                Student student = new Student(name, age, grade);
                sms.addStudent(student);
                System.out.println("添加学生成功！");
            } else if (option == 2) {
                System.out.print("请输入要删除的学生姓名: ");
                String name = scanner.nextLine();
                sms.removeStudent(name);
                System.out.println("删除学生成功！");
            } else if (option == 3) {
                List<Student> students = sms.getStudents();
                if (students.isEmpty()) {
                    System.out.println("暂无学生信息！");
                } else {
                    System.out.println("学生信息如下：");
                    for (Student student : students) {
                        System.out.println("姓名: " + student.getName());
                        System.out.println("年龄: " + student.getAge());
                        System.out.println("年级: " + student.getGrade());
                        System.out.println("------------------------");
                    }
                }
            } else if (option == 4) {
                System.out.println("退出学生管理系统。");
                break;
            } else {
                System.out.println("无效的选项，请重新输入！");
            }

            System.out.println();
        }

        scanner.close();
    }
}