Java 学生信息管理系统

以下是一个简单的Java学生信息管理系统的示例：

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

public class StudentManagementSystem {
    private ArrayList<Student> studentList;

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

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

    public void deleteStudent(String id) {
        for (int i = 0; i < studentList.size(); i++) {
            Student student = studentList.get(i);
            if (student.getId().equals(id)) {
                studentList.remove(i);
                System.out.println("学生信息删除成功！");
                return;
            }
        }
        System.out.println("该学生信息不存在，请重新输入：");
    }

    public void viewAllStudents() {
        for (Student student : studentList) {
            student.printInformation();
        }
    }

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

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加学生信息");            System.out.println("2. 删除学生信息");
            System.out.println("3. 查看所有学生信息");
            System.out.println("4. 退出");

            int choice = scanner.nextInt();
            scanner.nextLine(); // 消耗换行符

            switch (choice) {
                case 1:
                    System.out.println("请输入学生的学号：");
                    String id = scanner.nextLine();
                    System.out.println("请输入学生的姓名：");
                    String name = scanner.nextLine();
                    System.out.println("请输入学生的年龄：");
                    int age = scanner.nextInt();
                    scanner.nextLine(); // 消耗换行符

                    Student student = new Student(id, name, age);
                    system.addStudent(student);
                    System.out.println("学生信息添加成功！");
                    break;
                case 2:
                    System.out.println("请输入要删除的学生的学号：");
                    String deleteId = scanner.nextLine();
                    system.deleteStudent(deleteId);
                    break;
                case 3:
                    system.viewAllStudents();
                    break;
                case 4:
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选择，请重新输入：");
                    break;
            }
        }
    }
}

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

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

    public String getId() {
        return id;
    }

    public void printInformation() {
        System.out.println("学号：" + id);
        System.out.println("姓名：" + name);
        System.out.println("年龄：" + age);
        System.out.println();
    }
}