学生管理系统Java项目

好的，下面是一个简单的学生管理系统Java项目，包含了学生信息的增删改查功能：

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

public class StudentManagementSystem {
    private ArrayList<Student> students = new ArrayList<>();

    public void addStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生姓名：");
        String name = scanner.nextLine();
        System.out.println("请输入学生年龄：");
        int age = scanner.nextInt();
        System.out.println("请输入学生性别：");
        String gender = scanner.next();
        System.out.println("请输入学生学号：");
        String id = scanner.next();
        Student student = new Student(name, age, gender, id);
        students.add(student);
        System.out.println("添加成功！");
    }

    public void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除的学生学号：");
        String id = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId().equals(id)) {
                students.remove(i);
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("未找到该学生！");
    }

    public void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要修改的学生学号：");
        String id = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId().equals(id)) {
                System.out.println("请输入学生姓名：");
                String name = scanner.nextLine();
                System.out.println("请输入学生年龄：");
                int age = scanner.nextInt();
                System.out.println("请输入学生性别：");
                String gender = scanner.next();
                Student student = new Student(name, age, gender, id);
                students.set(i, student);
                System.out.println("修改成功！");
                return;
            }
        }
        System.out.println("未找到该学生！");
    }

    public void queryStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要查询的学生学号：");
        String id = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId().equals(id)) {
                System.out.println(students.get(i));
                return;
            }
        }
        System.out.println("未找到该学生！");
    }

    public void showAllStudents() {
        for (int i = 0; i < students.size(); i++) {
            System.out.println(students.get(i));
        }
    }

    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");
            System.out.println("2. 删除学生");
            System.out.println("3. 修改学生");
            System.out.println("4. 查询学生");
            System.out.println("5. 显示所有学生");
            System.out.println("0. 退出系统");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    system.addStudent();
                    break;
                case 2:
                    system.deleteStudent();
                    break;
                case 3:
                    system.updateStudent();
                    break;
                case 4:
                    system.queryStudent();
                    break;
                case 5:
                    system.showAllStudents();
                    break;
                case 0:
                    System.exit(0);
                default:
                    System.out.println("输入有误，请重新输入！");
            }
        }
    }
}

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

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

    public String getGender() {
        return gender;
    }

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

    public String getId() {
        return id;
    }

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

    @Override
    public String toString() {
        return "学生信息：" +
                "姓名='" + name + '\'' +
                ", 年龄=" + age +
                ", 性别='" + gender + '\'' +
                ", 学号='" + id + '\'';
    }
}