Japan Institute for Educational Measurement interview questions

After clearing the initial test, the next round- interview started with me briefly describing my career & academic past. Which followed with the firing of questions from the panel of 2 members who were the interviewers. To me the interviewers appeared not interested in conducting this interview as they themselves looked dull, sleepy and unenthusiastic, only one of the 2 was keen on asking me quesions the other female interviewer continued with typing/ fixing some code on her laptop, she didnt ask me anything more except for one question on multithreading for which I cleared at the onset that I have not worked on multithreading ever, yet she continued bombarding questions on threads. Probably the worst interview I've ever gone through. There was a particular question I recall wherein the male interviewer asked me do you know about Prototype Design Pattern, to which replied yes. He asked what it is, why is it used, I gave an example of Cloneable Interface & clone method and also said that in situations when creating objects is costly, using prototype you can create a clone of the object and use that instead. But he kept on asking why do we need to create a clone and all... It all lasted for1hr 15 min. Overall it looked like they had already hired someone for the position I was being interviewed, and they were extremely dull, I couldn't understand their language - had to almost ask them to repeat it for me.