Infosys interview question

Class, Interface, Abstarct Class, final, Overloading, Overriding, static, String immutable, Objects, Arraylist, TreeSet, Hash Map, Iterator, Exceptions, Comparable vs Comparator, JDBC, PrepareStatement, Sql group by, having, count, aggregate operations, union, intersection, Triggers and Joins(Inner, Outer, Right Join vs Left Join).