设计一个学生管理系统 要求: 1、创建一个Java类,名为Student,包含以下属性:学生姓名(name)、学生年龄(age)、学生成绩(score)。 2、创建一个接口,名为Comparable,包含一个抽象方法compareTo(),用于

比较两个学生对象的成绩大小。

3、创建一个学生管理系统类(StudentManagementSystem)，包含以下功能:
（1）添加学生
（2）删除学生
（3）修改学生信息
（4）按照学生成绩排序显示所有学生信息

具体实现如下：

1、Student类的代码如下：

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

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

    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 int getScore() {
        return score;
    }

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

2、Comparable接口的代码如下：

public interface Comparable {
    int compareTo(Student student);
}

3、StudentManagementSystem类的代码如下：

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

public class StudentManagementSystem {
    private List<Student> students;

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

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

    public void deleteStudent(Student student) {
        students.remove(student);
    }

    public void modifyStudent(Student student, String name, int age, int score) {
        student.setName(name);
        student.setAge(age);
        student.setScore(score);
    }

    public void sortByScore() {
        Collections.sort(students, (s1, s2) -> s2.getScore() - s1.getScore());
    }

    public void showStudents() {
        for (Student student : students) {
            System.out.println("姓名：" + student.getName() + "，年龄：" + student.getAge() + "，成绩：" + student.getScore());
        }
    }

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：");
            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、按照学生成绩排序显示所有学生信息");

            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    System.out.println("请输入学生姓名：");
                    String name = scanner.next();
                    System.out.println("请输入学生年龄：");
                    int age = scanner.nextInt();
                    System.out.println("请输入学生成绩：");
                    int score = scanner.nextInt();
                    Student student = new Student(name, age, score);
                    system.addStudent(student);
                    break;
                case 2:
                    System.out.println("请输入学生姓名：");
                    name = scanner.next();
                    for (Student s : system.students) {
                        if (s.getName().equals(name)) {
                            system.deleteStudent(s);
                            break;
                        }
                    }
                    break;
                case 3:
                    System.out.println("请输入学生姓名：");
                    name = scanner.next();
                    for (Student s : system.students) {
                        if (s.getName().equals(name)) {
                            System.out.println("请输入学生姓名：");
                            String newName = scanner.next();
                            System.out.println("请输入学生年龄：");
                            int newAge = scanner.nextInt();
                            System.out.println("请输入学生成绩：");
                            int newScore = scanner.nextInt();
                            system.modifyStudent(s, newName, newAge, newScore);
                            break;
                        }
                    }
                    break;
                case 4:
                    system.sortByScore();
                    system.showStudents();
                    break;
                default:
                    System.out.println("输入错误，请重新选择！");
                    break;
            }
        }
    }
}

以上就是一个简单的学生管理系统的设计和实现，可以根据实际情况进行修改和扩展。