Nextalytics Software Services Junior Java Developer interview questions

1)what is collection?how many interface of collectn 2)what are oops concept?wxplain encapsulation? 3)can constructor overloading happens in java 4)method overloading and method overriding 5)what is exception?an how will we handled exceptin 6)what is multithreading?expalin it using real time example? 7)what is thread? 8)one query on inner join and update? 9)introduced about youreself? 10)what is requst dispatcher? 11)diff betwn preaperd statment and callable statment