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 not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.
In the current series of posts I am writing on reducing the number of parameters required to call Java methods and constructors, I have focused so far on approaches that directly affect the parameters ...