用Java语言写一个学生成绩管理系统项目

好的，我可以为您提供一份基本的Java学生成绩管理系统项目的代码模板，您可以在此基础上进行修改和扩展。

首先，我们需要定义一个`Student`类来表示学生，包括学生姓名、学号和成绩等属性。代码如下：

public class Student {
    private String name;
    private String id;
    private int score;

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

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public int getScore() {
        return score;
    }

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

然后，我们定义一个`StudentManagementSystem`类来管理学生信息，包括添加学生、删除学生、修改学生信息和查询学生信息等功能。代码如下：

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

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

    public void addStudent(Student student) {
        students.add(student);
    }

    public void removeStudent(String id) {
        Student student = findStudent(id);
        if (student != null) {
            students.remove(student);
        } else {
            System.out.println("学号为" + id + "的学生不存在！");
        }
    }

    public void updateStudent(String id, int score) {
        Student student = findStudent(id);
        if (student != null) {
            student.setScore(score);
        } else {
            System.out.println("学号为" + id + "的学生不存在！");
        }
    }

    public void queryStudent(String id) {
        Student student = findStudent(id);
        if (student != null) {
            System.out.println("学生姓名：" + student.getName() + "，学号：" + student.getId() + "，成绩：" + student.getScore());
        } else {
            System.out.println("学号为" + id + "的学生不存在！");
        }
    }

    private Student findStudent(String id) {
        for (Student student : students) {
            if (student.getId().equals(id)) {
                return student;
            }
        }
        return null;
    }

    public void start() {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择要进行的操作：");
            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. 退出系统");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    System.out.print("请输入学生姓名：");
                    String name = scanner.next();
                    System.out.print("请输入学生学号：");
                    String id = scanner.next();
                    System.out.print("请输入学生成绩：");
                    int score = scanner.nextInt();
                    Student student = new Student(name, id, score);
                    addStudent(student);
                    System.out.println("添加成功！");
                    break;
                case 2:
                    System.out.print("请输入要删除的学生学号：");
                    id = scanner.next();
                    removeStudent(id);
                    break;
                case 3:
                    System.out.print("请输入要修改信息的学生学号：");
                    id = scanner.next();
                    System.out.print("请输入新的成绩：");
                    score = scanner.nextInt();
                    updateStudent(id, score);
                    break;
                case 4:
                    System.out.print("请输入要查询信息的学生学号：");
                    id = scanner.next();
                    queryStudent(id);
                    break;
                case 5:
                    System.out.println("退出系统！");
                    System.exit(0);
                    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.start();
    }
}

以上就是一个简单的Java学生成绩管理系统项目的代码模板。您可以根据需要进行修改和扩展。