请用java实现：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；

好的，以下是Java代码实现：

import java.util.*;

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;
    }

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

    public static void main(String[] args) {
        // 通过数组实现
        Student[] studentsArray = new Student[5];
        studentsArray[0] = new Student("张三", 18, "男");
        studentsArray[1] = new Student("李四", 19, "女");
        studentsArray[2] = new Student("王五", 20, "男");
        studentsArray[3] = new Student("赵六", 21, "女");
        studentsArray[4] = new Student("钱七", 22, "男");
        System.out.println("通过数组实现：");
        for (int i = 0; i < studentsArray.length; i++) {
            System.out.println(studentsArray[i]);
        }

        // 通过集合转数组实现
        List<Student> studentsList = new ArrayList<>();
        studentsList.add(new Student("张三", 18, "男"));
        studentsList.add(new Student("李四", 19, "女"));
        studentsList.add(new Student("王五", 20, "男"));
        studentsList.add(new Student("赵六", 21, "女"));
        studentsList.add(new Student("钱七", 22, "男"));
        Student[] studentsArray2 = studentsList.toArray(new Student[0]);
        System.out.println("通过集合转数组实现：");
        for (int i = 0; i < studentsArray2.length; i++) {
            System.out.println(studentsArray2[i]);
        }

        // 通过集合迭代器实现
        List<Student> studentsList2 = new ArrayList<>();
        studentsList2.add(new Student("张三", 18, "男"));
        studentsList2.add(new Student("李四", 19, "女"));
        studentsList2.add(new Student("王五", 20, "男"));
        studentsList2.add(new Student("赵六", 21, "女"));
        studentsList2.add(new Student("钱七", 22, "男"));
        System.out.println("通过集合迭代器实现：");
        Iterator<Student> iterator = studentsList2.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
    }
}

输出如下：

通过数组实现：
Student{name='张三', age=18, gender='男'}
Student{name='李四', age=19, gender='女'}
Student{name='王五', age=20, gender='男'}
Student{name='赵六', age=21, gender='女'}
Student{name='钱七', age=22, gender='男'}
通过集合转数组实现：
Student{name='张三', age=18, gender='男'}
Student{name='李四', age=19, gender='女'}
Student{name='王五', age=20, gender='男'}
Student{name='赵六', age=21, gender='女'}
Student{name='钱七', age=22, gender='男'}
通过集合迭代器实现：
Student{name='张三', age=18, gender='男'}
Student{name='李四', age=19, gender='女'}
Student{name='王五', age=20, gender='男'}
Student{name='赵六', age=21, gender='女'}
Student{name='钱七', age=22, gender='男'}