用Java编写一个程序，模拟学生管理系统。可以实现对学生信息的添加、删除、修改和查询功能，要求使用List集合存储自定义的对象集合，并熟练使用List集合的中常用方法实现相关的操作并且使用Iterator迭代器

好的，我明白了你的问题。下面是一个基本的Java程序，用于模拟学生管理系统，实现了添加、删除、修改和查询学生信息的基本功能。该程序使用List集合存储自定义的Student对象集合，并使用Iterator迭代器实现相关的操作。

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

public class StudentManagementSystem {

    private List<Student> studentList;

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

    public static void main(String[] args) {
        StudentManagementSystem sms = new StudentManagementSystem();
        sms.run();
    }

    public void run() {
        int choice;
        Scanner scanner = new Scanner(System.in);

        do {
            System.out.println("学生管理系统：");
            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. 查询学生");
            System.out.println("0. 退出");
            System.out.print("请输入您的选择: ");
            choice = scanner.nextInt();
            
            switch (choice) {
                case 1:
                    addStudent(scanner);
                    break;
                case 2:
                    deleteStudent(scanner);
                    break;
                case 3:
                    modifyStudent(scanner);
                    break;
                case 4:
                    queryStudent(scanner);
                    break;
                case 0:
                    System.out.println("退出程序！");
                    break;
                default:
                    System.out.println("无效选择，请重新选择！");
            }
        } while (choice != 0);

        scanner.close();
    }

    public void addStudent(Scanner scanner) {
        String name, id;
        int age;

        System.out.print("请输入学生姓名: ");
        name = scanner.next();

        System.out.print("请输入学生学号: ");
        id = scanner.next();

        System.out.print("请输入学生年龄: ");
        age = scanner.nextInt();

        // 创建一个新的Student对象并添加到列表中
        Student student = new Student(name, id, age);
        studentList.add(student);

        System.out.println("添加成功！");
    }

    public void deleteStudent(Scanner scanner) {
        String id;

        System.out.print("请输入要删除学生的学号: ");
        id = scanner.next();

        Iterator<Student> it = studentList.iterator();
        while (it.hasNext()) {
            Student student = it.next();
            if (student.getId().equals(id)) {
                it.remove();
                System.out.println("删除成功！");
                return;
            }
        }

        System.out.println("没有找到该学生！");
    }

    public void modifyStudent(Scanner scanner) {
        String id, name;
        int age;

        System.out.print("请输入要修改学生的学号: ");
        id = scanner.next();

        Iterator<Student> it = studentList.iterator();
        while (it.hasNext()) {
            Student student = it.next();
            if (student.getId().equals(id)) {
                System.out.print("请输入新的学生姓名: ");
                name = scanner.next();
                student.setName(name);

                System.out.print("请输入新的学生年龄: ");
                age = scanner.nextInt();
                student.setAge(age);

                System.out.println("修改成功！");
                return;
            }
        }

        System.out.println("没有找到该学生！");
    }

    public void queryStudent(Scanner scanner) {
        String id;

        System.out.print("请输入要查询学生的学号: ");
        id = scanner.next();

        Iterator<Student> it = studentList.iterator();
        while (it.hasNext()) {
            Student student = it.next();
            if (student.getId().equals(id)) {
                System.out.println(student);
                return;
            }
        }

        System.out.println("没有找到该学生！");
    }
}

class Student {

    private String name;
    private String id;
    private int age;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "学生信息: " + name + ", " + id + ", " + age;
    }
}

请注意，这只是一个基本的实现，可能不适用于所有情况，并且可能需要进行改进和优化。如果您需要更复杂的学生管理系统，请根据您的具体需求进行开发。