Happiest Minds Technologies Java J2EE Developer interview questions

Got call from consultancy for happiest minds interview on Saturday, they conducted in hotel because branch is not available in chennai. Interview process are little slow. They took total four rounds and every round is elimination rounds. first round is written test which is little difficult, second round is pure technical asked write programs for different scenarios, 3rd round is also technical and managerial asked to about programs and design pattern and last one is Hr. Overall is moderate interview questions.