A friend of mine and one of my friends

Either can be used, I think which one depends on the conversation. The first, maybe when talking about who works in banks
Sent.2 maybe when you are talking about where your friends work.

Really it is not a definite difference. Either could be used in both situations.

Hello Jeannie,

Thank you for your comments.
Actually, I had thought that "a friend of mine" sounded more natural than "one of my friends."
Now I have understood that I can use both of them.

Thank you again!

Yes, both are fine.

Yup u r right..."a friend of mine" looks too personal and "one of my friends" seems pretty formal.

It's a personal preference: I tend to avoid the "double possessive" (of + mine), which doesn't seem to bother many people.

I'm Chinese guy,it's some funny that You discussed the english question as an english man.I have studied English for more than 10 years.I'm some dizzy of it.

I'm Chinese guy,it's some funny that You discussed the english question as an english man.I have studied English for more than 10 years.I'm some dizzy of it.

I am a Chinese guy. It's funny that you discuss English usage and doubts surrounding it even though English is your first language. I have studied English for more than 10 years and the language still makes me dizzy.

obviously 10 years is not enough for you...try harder

lexi0077 Hi,
Do you find any difference between the two sentences below in terms of nuance?
If you talked to someone, which sentence would you use?
1. A friend of mine works for a bank.
2. One of my friends works for a bank.
Thanks,
Lex