java学生管理系统

以下是一个简单的Java学生管理系统的示例代码，实现了添加、删除、修改和查询学生信息的功能：

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

public class StudentManagementSystem {

    private List<Student> studentList;

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

    public void addStudent() {
        Scanner scanner = new Scanner(System.in);
        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("请输入学生性别：");
        String gender = scanner.nextLine();
        System.out.print("请输入学生学号：");
        String id = scanner.nextLine();

        Student student = new Student(name, age, gender, id);
        studentList.add(student);

        System.out.println("添加学生成功！");
    }

    public void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除的学生学号：");
        String id = scanner.nextLine();

        for (Student student : studentList) {
            if (student.getId().equals(id)) {
                studentList.remove(student);
                System.out.println("删除学生成功！");
                return;
            }
        }

        System.out.println("未找到对应学生！");
    }

    public void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要修改的学生学号：");
        String id = scanner.nextLine();

        for (Student student : studentList) {
            if (student.getId().equals(id)) {
                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("请输入学生性别：");
                String gender = scanner.nextLine();

                student.setName(name);
                student.setAge(age);
                student.setGender(gender);

                System.out.println("修改学生成功！");
                return;
            }
        }

        System.out.println("未找到对应学生！");
    }

    public void queryStudent() {
        for (Student student : studentList) {
            System.out.println(student);
        }
    }

    public void showMenu() {
        System.out.println("欢迎使用学生管理系统！");
        System.out.println("1. 添加学生信息");
        System.out.println("2. 删除学生信息");
        System.out.println("3. 修改学生信息");
        System.out.println("4. 查询学生信息");
        System.out.println("0. 退出程序");
        System.out.print("请输入操作编号：");
    }

    public void run() {
        Scanner scanner = new Scanner(System.in);
        boolean flag = true;
        while (flag) {
            showMenu();
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    updateStudent();
                    break;
                case 4:
                    queryStudent();
                    break;
                case 0:
                    flag = false;
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();
        system.run();
    }
}

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 "姓名：" + name + ", 年龄：" + age + ", 性别：" + gender + ", 学号：" + id;
    }
}

该程序使用了List集合存储学生对象集合，并且熟练使用了List集合的中常用方法实现相关的操作。运行该程序后，会显示一个菜单，根据需要选择相应的操作即可完成相应功能。