American Express Senior Java Developer interview questions

I had an online programming coding test and then a telephonic roung technica round and then face to face round. I had appeared for the interview and I came up with below questions, I have drafted the advance questions asked on Java 8 features for Senior Developer.

First round was written. After thar they called for F2F interviews. There were 2 technical and one managerial round. I cleared all the rounds and HR told that they will come back to me next day. Next day she informed that I have been put on hold as they want to interview more guys but yes I am the first one who has cleared all the rounds. After that I never got a call.