Energize Global Services Junior Java Developer interview questions

Although interview was for java developer position, there where a lot of questions that didnt related to that position at all, but anyway I've correctly answered about 60-65% of them(I've checked it after interview). Interview lasted about 2 hours and after that I've felt myself as squeezed lemon, and I dont understand why it lasted so long if they were not going to give an offer? Why they waste MY and their own time for nothing? In fact, I'm really happy, that I dont work there, because it'd be difficult for me to work somewhere, where time of employee doesnt make any sense.