如何只允许特定类的元素作为迭代器的元素(对于自定义类)

import java.util.Iterator;
import java.util.NoSuchElementException;

// 自定义可迭代类
public class CustomIterable<T> implements Iterable<T> {
    private T[] elements;
    private int size;

    public CustomIterable(T[] elements) {
        this.elements = elements;
        this.size = elements.length;
    }

    @Override
    public Iterator<T> iterator() {
        return new CustomIterator();
    }

    // 自定义迭代器类
    private class CustomIterator implements Iterator<T> {
        private int cursor;

        public CustomIterator() {
            this.cursor = 0;
        }

        @Override
        public boolean hasNext() {
            while (cursor < size) {
                if (elements[cursor] instanceof SpecialElement) {
                    return true;
                }
                cursor++;
            }
            return false;
        }

        @Override
        public T next() {
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            return elements[cursor++];
        }
    }

    // 自定义特定类
    private interface SpecialElement {
        // 特定类的方法
    }

    // 其他自定义类
    private class OtherElement implements SpecialElement {
        // 其他类的方法
    }

    // 测试代码
    public static void main(String[] args) {
        CustomIterable<Object> iterable = new CustomIterable<>(new Object[]{new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement(), new OtherElement()});
        for (Object element : iterable) {
            System.out.println(element);
        }
    }
}