用java编写一个成绩管理系统包括增删改查

好的，我可以为您提供一个简单的成绩管理系统的Java代码，包括增加、删除、修改和查询成绩的功能。以下是示例代码：

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

public class ScoreManagementSystem {
    static ArrayList<Student> studentList = new ArrayList<Student>();
    static Scanner scanner = new Scanner(System.in);
    
    public static void main(String[] args) {
        boolean loop = true;
        
        while (loop) {
            System.out.println("请选择您要进行的操作：");
            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. 退出系统");
            
            int choice = scanner.nextInt();
            switch (choice) {
            case 1:
                addStudent();
                break;
            case 2:
                deleteStudent();
                break;
            case 3:
                modifyStudent();
                break;
            case 4:
                queryStudent();
                break;
            case 5:
                loop = false;
                break;
            default:
                System.out.println("输入有误，请重新输入！");
                break;
            }
        }
    }
    
    public static void addStudent() {
        System.out.println("请输入学生姓名：");
        String name = scanner.next();
        System.out.println("请输入学生学号：");
        int number = scanner.nextInt();
        System.out.println("请输入学生成绩：");
        double score = scanner.nextDouble();
        
        Student student = new Student(name, number, score);
        studentList.add(student);
        System.out.println("添加成功！");
    }
    
    public static void deleteStudent() {
        System.out.println("请输入要删除学生的学号：");
        int number = scanner.nextInt();
        
        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getNumber() == number) {
                studentList.remove(i);
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("没有找到该学生！");
    }
    
    public static void modifyStudent() {
        System.out.println("请输入要修改学生的学号：");
        int number = scanner.nextInt();
        
        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getNumber() == number) {
                System.out.println("请输入修改后的学生姓名：");
                String name = scanner.next();
                System.out.println("请输入修改后的学生成绩：");
                double score = scanner.nextDouble();
                
                studentList.get(i).setName(name);
                studentList.get(i).setScore(score);
                System.out.println("修改成功！");
                return;
            }
        }
        System.out.println("没有找到该学生！");
    }
    
    public static void queryStudent() {
        System.out.println("请输入要查询学生的学号：");
        int number = scanner.nextInt();
        
        for (int i = 0; i < studentList.size(); i++) {
            if (studentList.get(i).getNumber() == number) {
                System.out.println(studentList.get(i));
                return;
            }
        }
        System.out.println("没有找到该学生！");
    }
}

class Student {
    private String name;
    private int number;
    private double score;
    
    public Student(String name, int number, double score) {
        this.name = name;
        this.number = number;
        this.score = score;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public int getNumber() {
        return number;
    }
    
    public void setNumber(int number) {
        this.number = number;
    }
    
    public double getScore() {
        return score;
    }
    
    public void setScore(double score) {
        this.score = score;
    }
    
    @Override
    public String toString() {
        return "学生姓名：" + name + "，学号：" + number + "，成绩：" + score;
    }
}

这个简单的成绩管理系统包含了添加学生、删除学生、修改学生信息和查询学生信息的功能。您可以根据自己的需求对代码进行修改和扩展。