现在有5个学生，请把5个学生信息通过以下三种方式分别进行存储、遍历和输出。 （1）数组实现； （2）集合转数组实现； （3）集合迭代器实现；

学生信息包括：姓名、年龄、性别。

首先，定义一个学生类：

public 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 int getAge() {
        return age;
    }

    public String getGender() {
        return gender;
    }
}

然后，创建5个实例：

Student s1 = new Student("张三", 18, "男");
Student s2 = new Student("李四", 19, "女");
Student s3 = new Student("王五", 20, "男");
Student s4 = new Student("赵六", 21, "女");
Student s5 = new Student("钱七", 22, "男");

### 数组实现

Student[] students = {s1, s2, s3, s4, s5};

// 遍历数组
for (int i = 0; i < students.length; i++) {
    System.out.println(students[i].getName() + "," + students[i].getAge() + "," + students[i].getGender());
}

### 集合转数组实现

List<Student> list = new ArrayList<>();
list.add(s1);
list.add(s2);
list.add(s3);
list.add(s4);
list.add(s5);

// 转为数组
Student[] students = list.toArray(new Student[list.size()]);

// 遍历数组
for (int i = 0; i < students.length; i++) {
    System.out.println(students[i].getName() + "," + students[i].getAge() + "," + students[i].getGender());
}

### 集合迭代器实现

List<Student> list = new ArrayList<>();
list.add(s1);
list.add(s2);
list.add(s3);
list.add(s4);
list.add(s5);

// 迭代器遍历
Iterator<Student> iterator = list.iterator();
while (iterator.hasNext()) {
    Student student = iterator.next();
    System.out.println(student.getName() + "," + student.getAge() + "," + student.getGender());
}