Altimetrik Java Software Developer interview questions

first round was about 1 hour 20 aptitude and 2 code second round-(TECHF2F) held at altimetrik questions to write program for stack,linked list,queue and data structure since i don't know java,i you know java you will have question for easy to hard level every round has elimination i was confident that i will clear the second round,but i was not shortlisted,actually the the missed my name i was called after i reach home that they missed my name and they said we ll have further rounds after few days but never called. third round-(TECH F2F)question based on the project and resume fourth round-(GENERAL F2F)General question about you