If you are fortunate enough to be using JDK 7, the newly available Objects class is the obvious (at least to me) choice for implementing the “common” Java object ...

It’s also worth noting that if a class does not override hashCode(), then its own hash code will obviously match that provided by Object. In the example above, the SimpleData class (not shown here) ...

A frequently asked question in a Java interview is: How to implement a Java HashMap? Java job seekers must fully grok this important concept if they want to ace the interview. The HashMap tutorial ...