用java写一个简单的学生系统

好的，以下是一个简单的学生系统的 Java 代码：

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

public class StudentSystem {
    private ArrayList<Student> students;

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

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

    public void removeStudent(Student student) {
        students.remove(student);
    }

    public void printAllStudents() {
        for (Student student : students) {
            System.out.println(student);
        }
    }

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

        while (true) {
            System.out.println("请输入操作：1.添加学生 2.删除学生 3.查看所有学生 4.退出");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.println("请输入学生姓名：");
                    String name = scanner.next();
                    System.out.println("请输入学生年龄：");
                    int age = scanner.nextInt();
                    Student student = new Student(name, age);
                    system.addStudent(student);
                    System.out.println("添加成功！");
                    break;
                case 2:
                    System.out.println("请输入要删除的学生姓名：");
                    String removeName = scanner.next();
                    boolean removed = false;
                    for (Student s : system.students) {
                        if (s.getName().equals(removeName)) {
                            system.removeStudent(s);
                            removed = true;
                            System.out.println("删除成功！");
                            break;
                        }
                    }
                    if (!removed) {
                        System.out.println("未找到该学生！");
                    }
                    break;
                case 3:
                    system.printAllStudents();
                    break;
                case 4:
                    System.out.println("退出系统！");
                    return;
                default:
                    System.out.println("无效操作！");
                    break;
            }
        }
    }
}

class Student {
    private String name;
    private int age;

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

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    @Override
    public String toString() {
        return "姓名：" + name + "，年龄：" + age;
    }
}