Knight Capital Java Developer interview questions

Had 2 phone interviews covering Core Java topics: multi-threading, Java definitions, garbage collection, etc. These went very well. I was asked in for a phone interview. I saw 3 people who asked me general background questions as well as asked questions with code examples. Out of the 3 people I spoke with, one person focused totally on thread/synchronized code examples. The questions were not too difficult, but it's something I didn't have too much experience with.