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A good explanation of frequently asked java interview question Iterator vs Enumeration.Between two Enumeration is older and its there from jdk 1.0 while iterator was introduced later.The functionality of Enumeration interface is duplicated by the Iterator interface.

How HashMap works in Java or sometime how get method work in HashMap is common interview questions now days. Almost everybody who worked in Java knows what hashMap is, where to use hashMap or difference between hashtable and HashMap then why this interview question becomes so special? Because of the breadth and depth this question offers. It has become very popular java interview question in almost any senior or mid-senior level java interviews. Questions start with simple statement "Have you used HashMap before" or "What is HashMap? Why do we use it "

This video explains about the need for loops (iteration statements) in programming and discusses about the while loop in detail.