Java is one of the top 3 programming languages in the world. It can be used to develop both web applications and desktop applications and more importantly it is cross platform--write once, run everywhere. Also, it's easy to pick up. If you want to be a Java developer, please get to ask yourself whether you know below listed topics.This list is summarized by Vivek Vermani, a Senior Java Developer:For a Core Java Developer , Ffollowing topics should be good.OOPs ConceptsAbstract Classes and InterfacesConstructors and initialization orderFile IO and SerializationCollections - List , Map , SetAcce...