java单链表学生系统增删改代码，学生类中带有学号，并重写方法使得链表按学号排序

在Java中，我们可以创建一个Student类，包含学号属性，然后定义一个双向链表（如LinkedList）结构来存储学生信息。这里我会提供一个基本的增删改查操作以及链表按学号排序的示例：

首先，定义Student类：

public class Student {
    private int studentId;
    private String name;

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

    // getters and setters for studentId and name
    public int getStudentId() { return studentId; }
    public void setStudentId(int studentId) { this.studentId = studentId; }
    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    @Override
    public String toString() {
        return "Student{" +
                "studentId=" + studentId +
                ", name='" + name + '\'' +
                '}';
    }
}

接下来，定义一个双向链表节点，包含Student对象：

class Node {
    Student student;
    Node prev;
    Node next;

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

// 双向链表类
public class StudentList {
    private Node head;
    private Node tail;

    // 添加、删除和修改操作...
    public void addStudent(Student student) {
        if (head == null) {
            head = new Node(student, null, null);
            tail = head;
        } else {
            Node current = head;
            while (current.next != null && current.next.getStudentId() < student.getStudentId()) {
                current = current.next;
            }
            if (current.next != null) {
                current.next.prev = current;
            }
            current.next = new Node(student, current, current.next);
            if (current.next == tail) {
                tail = current.next;
            }
        }
    }

    // 删除操作...
    public void removeStudent(int id) {
        // 略
    }

    // 修改操作...
    public void updateStudent(int id, String newName) {
        // 略

    }

    // 按学号排序并打印链表
    public void sortAndPrintStudents() {
        if (head == null) {
            System.out.println("链表为空");
            return;
        }
        Collections.sort(head, new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                return Integer.compare(s1.getStudentId(), s2.getStudentId());
            }
        });
        printList();
    }

    private void printList() {
        Node current = head;
        while (current != null) {
            System.out.println(current.student);
            current = current.next;
        }
    }
}