WiFi Networks Java Developer interview questions

Hello guy. I attended Interview in wifi network last few day ago. First round was 40 marks question. i cleared first round and go for further technical round. you know what happend technical guys ask me lot of question related to core java and advance java. really He was gadha. whatever he know that one only correct and in between he went somewhere or come he ask me many more time what's your name. i never seen that kind of man. he is totally mental.