java用单链表写一个简单的学生系统

好的，以下是一个简单的Java代码示例，用单链表实现学生系统：

import java.util.Scanner;

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

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

    public String toString() {
        return "Student ID: " + id + ", Name: " + name + ", Score: " + score;
    }
}

class Node {
    Student student;
    Node next;

    public Node(Student student) {
        this.student = student;
        this.next = null;
    }
}

class StudentList {
    Node head;

    public StudentList() {
        head = null;
    }

    public void addStudent(Student student) {
        Node newNode = new Node(student);

        if (head == null) {
            head = newNode;
        } else {
            Node currentNode = head;
            while (currentNode.next != null) {
                currentNode = currentNode.next;
            }
            currentNode.next = newNode;
        }
    }

    public void displayStudents() {
        Node currentNode = head;
        while (currentNode != null) {
            System.out.println(currentNode.student);
            currentNode = currentNode.next;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        StudentList studentList = new StudentList();

        int choice = 0;
        while (true) {
            System.out.println("\nPlease select an option:");
            System.out.println("1. Add a student");
            System.out.println("2. Display all students");
            System.out.println("3. Exit");

            choice = scanner.nextInt();

            if (choice == 1) {
                System.out.println("\nEnter student ID:");
                int id = scanner.nextInt();
                System.out.println("Enter student name:");
                String name = scanner.next();
                System.out.println("Enter student score:");
                int score = scanner.nextInt();

                Student student = new Student(id, name, score);
                studentList.addStudent(student);

                System.out.println("\nStudent added successfully!");

            } else if (choice == 2) {
                System.out.println("\nStudent List:");
                studentList.displayStudents();

            } else if (choice == 3) {
                System.out.println("\nExiting...");
                break;

            } else {
                System.out.println("\nInvalid choice!");
            }
        }

        scanner.close();
    }
}

这个程序使用了单链表来存储学生对象，实现了添加学生和显示所有学生的功能。当用户选择添加学生时，程序会要求用户输入学生的ID、姓名和成绩，然后将学生添加到单链表中。当用户选择显示所有学生时，程序会遍历单链表并打印每个学生的信息。用户可以通过选择“退出”选项来结束程序的运行。