java编写学生管理系统

好的，学生管理系统是一个比较常见的项目，以下是一个简单的Java实现：

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

public class StudentManagementSystem {
    private ArrayList<Student> students;
    private Scanner scanner;

    public StudentManagementSystem() {
        students = new ArrayList<>();
        scanner = new Scanner(System.in);
    }

    public void run() {
        while (true) {
            System.out.println("请输入您要进行的操作：");
            System.out.println("1. 添加学生");
            System.out.println("2. 删除学生");
            System.out.println("3. 修改学生信息");
            System.out.println("4. 查询学生信息");
            System.out.println("5. 退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addStudent();
                    break;
                case 2:
                    deleteStudent();
                    break;
                case 3:
                    modifyStudent();
                    break;
                case 4:
                    queryStudent();
                    break;
                case 5:
                    System.out.println("感谢使用学生管理系统！");
                    return;
                default:
                    System.out.println("输入无效，请重新输入！");
                    break;
            }
        }
    }

    private void addStudent() {
        Student student = new Student();
        System.out.println("请输入学生姓名：");
        student.setName(scanner.next());
        System.out.println("请输入学生年龄：");
        student.setAge(scanner.nextInt());
        System.out.println("请输入学生性别：");
        student.setGender(scanner.next());
        students.add(student);
        System.out.println("添加学生成功！");
    }

    private void deleteStudent() {
        System.out.println("请输入要删除的学生姓名：");
        String name = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getName().equals(name)) {
                students.remove(i);
                System.out.println("删除学生成功！");
                return;
            }
        }
        System.out.println("该学生不存在！");
    }

    private void modifyStudent() {
        System.out.println("请输入要修改的学生姓名：");
        String name = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getName().equals(name)) {
                Student student = students.get(i);
                System.out.println("请输入学生年龄（原年龄为" + student.getAge() + "）：");
                student.setAge(scanner.nextInt());
                System.out.println("请输入学生性别（原性别为" + student.getGender() + "）：");
                student.setGender(scanner.next());
                System.out.println("修改学生信息成功！");
                return;
            }
        }
        System.out.println("该学生不存在！");
    }

    private void queryStudent() {
        System.out.println("请输入要查询的学生姓名：");
        String name = scanner.next();
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getName().equals(name)) {
                Student student = students.get(i);
                System.out.println("学生姓名：" + student.getName());
                System.out.println("学生年龄：" + student.getAge());
                System.out.println("学生性别：" + student.getGender());
                return;
            }
        }
        System.out.println("该学生不存在！");
    }

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

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

    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;
    }
}

这个程序实现了添加、删除、修改和查询学生信息的功能。主程序通过一个循环来不断读取用户输入的操作选项，然后根据用户的选择调用相应的方法来进行处理。其中，学生信息被存储在一个ArrayList<Student>对象中，每个学生的信息由一个Student对象表示。在每个操作方法中，程序都会提示用户输入相应的信息，并对输入进行验证，确保输入的信息符合要求。