How HashMap works in Java How HashMap works in Java or sometime
how get method work in HashMap is common questions on Java
interviews now days. Almost everybody who worked in Java knows
about HashMap, where to use HashMap or difference between
Hashtable and HashMap then why this interview question becomes
so special? Because of the depth it offers. It has become very
popular java interview question in almost any senior or mid-
senior level Java interviews. Investment banks mostly prefer to
ask this question and some time even ask to implement your own
HashMap based upon your coding aptitude. Introduction of
ConcurrentHashMap and other concurrent collections has also made
this questions as starting point to delve into more advanced
feature. let's start the journey. Questions start with simple
statement "Have you used HashMap before" or "What is HashMap?
Why do we use it “ Almost everybody answers this with yes and
then interviewee keep talking about common facts about HashMap
like HashMap accept null while Hash