Java 8 features? What is functional interface? Difference between Runnable and Callable? Write java8 syntax in notepad? Mainly interviewer was focusing that how much syntax I know, which is not at all good. The interview was not at all, as per the role/ level of experience of the candidate. It's like less experience employee opened up a interview questions list in google and taking an interview of senior and he doesn't know what all things to be asked.