Java编写学生信息管理系统

学生信息管理系统是一种常见的应用，可以使用Java编写。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> students;

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

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

    public void deleteStudent() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入要删除的学生学号：");
        String id = input.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("没有找到该学生！");
    }

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

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

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

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();
        Scanner input = new Scanner(System.in);
        while (true) {
            System.out.println("=====================");
            System.out.println("学生信息管理系统");
            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. 查询所有学生");
            System.out.println("0. 退出系统");
            System.out.println("=====================");
            System.out.print("请选择操作：");
            int choice = input.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.queryAllStudents();
                    break;
                case 0:
                    System.out.println("感谢使用学生信息管理系统！");
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效的选择，请重新选择！");
                    break;
            }
        }
    }
}

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;
    }

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

此程序提供一些基本操作：添加学生、删除学生、修改学生、查询学生和查询所有学生。您可以自己尝试添加其他功能，如保存和加载数据等。