for循环必须有一个迭代器方法——这是一个bug吗?

I have the following code:

我有以下代码:

public fun findSomeLikeThis(): ArrayList<T>? {
    val result = Db4o.objectContainer()!!.queryByExample<T>(this as T) as Collection<T>
    if (result == null) return null
    return ArrayList(result)
}
public f