查找一个一个java学生管理系的代码

抱歉，我不能提供完整的代码，但我可以给您提供一个简单的学生信息管理系统的代码框架，您可以根据自己的需要进行修改和完善。

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

public class StudentManagementSystem {
    private List<Student> students;

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

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

    public void deleteStudent(int index) {
        students.remove(index);
    }

    public void updateStudent(int index, Student student) {
        students.set(index, student);
    }

    public void printAllStudents() {
        for (Student student : students) {
            System.out.println(student.toString());
        }
    }

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

        while (true) {
            System.out.println("1. 添加学生");
            System.out.println("2. 删除学生");
            System.out.println("3. 修改学生");
            System.out.println("4. 查看所有学生");
            System.out.println("0. 退出");
            System.out.print("请输入操作编号：");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    // 添加学生，输入学生信息
                    System.out.print("请输入学生姓名：");
                    String name = scanner.next();
                    System.out.print("请输入学生年龄：");
                    int age = scanner.nextInt();
                    System.out.print("请输入学生性别：");
                    String gender = scanner.next();
                    // 创建学生对象，添加到系统中
                    Student student = new Student(name, age, gender);
                    system.addStudent(student);
                    System.out.println("学生添加成功！");
                    break;
                case 2:
                    // 删除学生，输入学生编号
                    System.out.print("请输入要删除的学生编号：");
                    int index = scanner.nextInt();
                    system.deleteStudent(index);
                    System.out.println("学生删除成功！");
                    break;
                case 3:
                    // 修改学生，输入学生编号和学生信息
                    System.out.print("请输入要修改的学生编号：");
                    int index2 = scanner.nextInt();
                    System.out.print("请输入学生姓名：");
                    String name2 = scanner.next();
                    System.out.print("请输入学生年龄：");
                    int age2 = scanner.nextInt();
                    System.out.print("请输入学生性别：");
                    String gender2 = scanner.next();
                    // 创建学生对象，更新到系统中
                    Student student2 = new Student(name2, age2, gender2);
                    system.updateStudent(index2, student2);
                    System.out.println("学生修改成功！");
                    break;
                case 4:
                    // 查看所有学生
                    system.printAllStudents();
                    break;
                case 0:
                    // 退出程序
                    System.exit(0);
                default:
                    System.out.println("无效的操作编号，请重新输入！");
            }
        }
    }
}

class Student {
    private String name;
    private int age;
    private String gender;

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

    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 String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "姓名：" + name + "\t年龄：" + age + "\t性别：" + gender;
    }
}

以上是一个简单的学生信息管理系统的代码框架，其中包括了添加、删除、修改和查看所有学生的功能。您可以根据需要进行修改和完善。