写一个java班级管理系统

好的，下面是一个简单的 Java 班级管理系统：

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

public class ClassManagementSystem {
    static ArrayList<Student> students = new ArrayList<>();  // 存储学生信息的数组列表
    static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("班级管理系统");
            System.out.println("1. 添加学生");
            System.out.println("2. 查找学生");
            System.out.println("3. 修改学生信息");
            System.out.println("4. 删除学生");
            System.out.println("5. 打印所有学生信息");
            System.out.println("0. 退出");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    findStudent();
                    break;
                case 3:
                    updateStudent();
                    break;
                case 4:
                    deleteStudent();
                    break;
                case 5:
                    printAllStudents();
                    break;
                case 0:
                    System.out.println("谢谢使用！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }

    private static void addStudent() {
        System.out.print("请输入学号：");
        int id = scanner.nextInt();
        System.out.print("请输入姓名：");
        String name = scanner.next();
        System.out.print("请输入性别（男/女）：");
        String gender = scanner.next();
        System.out.print("请输入年龄：");
        int age = scanner.nextInt();
        System.out.print("请输入成绩：");
        double score = scanner.nextDouble();

        Student student = new Student(id, name, gender, age, score);
        students.add(student);
        System.out.println("添加成功！");
    }

    private static void findStudent() {
        System.out.print("请输入要查找的学生姓名：");
        String name = scanner.next();
        boolean flag = false;  // 标记是否找到学生
        for (Student student : students) {
            if (student.getName().equals(name)) {
                System.out.println(student);
                flag = true;
            }
        }
        if (!flag) {
            System.out.println("未找到该学生！");
        }
    }

    private static void updateStudent() {
        System.out.print("请输入要修改的学生姓名：");
        String name = scanner.next();
        boolean flag = false;  // 标记是否找到学生
        for (Student student : students) {
            if (student.getName().equals(name)) {
                System.out.print("请输入新的学号：");
                int id = scanner.nextInt();
                System.out.print("请输入新的姓名：");
                String newName = scanner.next();
                System.out.print("请输入新的性别（男/女）：");
                String gender = scanner.next();
                System.out.print("请输入新的年龄：");
                int age = scanner.nextInt();
                System.out.print("请输入新的成绩：");
                double score = scanner.nextDouble();

                student.setId(id);
                student.setName(newName);
                student.setGender(gender);
                student.setAge(age);
                student.setScore(score);

                flag = true;
                System.out.println("修改成功！");
            }
        }
        if (!flag) {
            System.out.println("未找到该学生！");
        }
    }

    private static void deleteStudent() {
        System.out.print("请输入要删除的学生姓名：");
        String name = scanner.next();
        boolean flag = false;  // 标记是否找到学生
        for (Student student : students) {
            if (student.getName().equals(name)) {
                students.remove(student);
                flag = true;
                System.out.println("删除成功！");
                break;
            }
        }
        if (!flag) {
            System.out.println("未找到该学生！");
        }
    }

    private static void printAllStudents() {
        System.out.println("所有学生信息如下：");
        for (Student student : students) {
            System.out.println(student);
        }
    }
}

// 学生类
class Student {
    private int id;  // 学号
    private String name;  // 姓名
    private String gender;  // 性别
    private int age;  // 年龄
    private double score;  // 成绩

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

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    @Override
    public String toString() {
        return "学号：" + id + "，姓名：" + name + "，性别：" + gender + "，年龄：" + age + "，成绩：" + score;
    }
}

这个班级管理系统可以添加、查找、修改、删除和打印所有学生信息。您可以根据需求进行修改和扩展。