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 ...

Bug 6321873 explains that the hash code returned by System.identityHashCode (Object) is not guaranteed to be unique (it’s a hash code after all). That being stated, there are situations in which the ...

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 ...

Let's say I have a class that encapsulates 2 other objects (Strings in my case, but could be anything). I want to override equals() and hashCode(), such that any 2 objects of my class with equal ...