java不用this方法写一个单链表的学生系统的增删改查

答：好的，我可以为您提供一个简单的单链表学生系统的实现，不使用this方法：

class Student {
    String name;
    int age;
    String gender;
    Student next;
}

class StudentList {
    Student head;

    // 增加学生
    public void add(String name, int age, String gender) {
        Student newStudent = new Student();
        newStudent.name = name;
        newStudent.age = age;
        newStudent.gender = gender;

        if (head == null) {
            head = newStudent;
        } else {
            Student current = head;
            while (current.next != null) {
                current = current.next;
            }
            current.next = newStudent;
        }
    }

    // 删除学生
    public void remove(String name) {
        if (head != null) {
            if (head.name.equals(name)) {
                head = head.next;
            } else {
                Student current = head;
                while (current.next != null && !current.next.name.equals(name)) {
                    current = current.next;
                }
                if (current.next != null) {
                    current.next = current.next.next;
                }
            }
        }
    }

    // 修改学生信息
    public void modify(String name, int age, String gender) {
        Student current = head;
        while (current != null) {
            if (current.name.equals(name)) {
                current.age = age;
                current.gender = gender;
                break;
            }
            current = current.next;
        }
    }

    // 查找学生信息
    public Student find(String name) {
        Student current = head;
        while (current != null) {
            if (current.name.equals(name)) {
                return current;
            }
            current = current.next;
        }
        return null;
    }
}

以上是一个简单的单链表学生系统的实现，可以进行增加、删除、修改和查找学生信息。具体使用方法可以参考以下示例代码：

public class Main {
    public static void main(String[] args) {
        // 创建学生列表
        StudentList students = new StudentList();

        // 增加学生
        students.add("张三", 20, "男");
        students.add("李四", 21, "女");
        students.add("王五", 22, "男");

        // 查找学生信息
        Student student = students.find("李四");
        if (student != null) {
            System.out.println("姓名：" + student.name);
            System.out.println("年龄：" + student.age);
            System.out.println("性别：" + student.gender);
        }

        // 修改学生信息
        students.modify("王五", 23, "女");

        // 删除学生
        students.remove("李四");
    }
}

希望这个实现对您有帮助，如有疑问请随时提出。