设置防止重复的URL

It's possible to prevent duplicated URL on Set?

喜欢:

http://www.mywebsite.com/somethings
http://www.mywebsite.com/somethings/

URL come dynamically, so, I don't know what is the url that will come, it can come with and without bar on final. I need to add all url's on Set preventing adding the same URL. I know that bars on final make the URL different, but it's possible to prevent it on Set?

private var urlList: MutableSet<URL> = mutableSetOf()

要么

private var urlList: MutableSet<String> = mutableSetOf()

It is Kotlin, but sample in Java are welcome.