One of the nasty little traps a Java developer can run into occurs when Collection.contains(Object) is not used with appropriate understanding. I demonstrate this ...

The most copied StackOverflow Java code snippet of all time contains a bug. The admission comes from the author of the snippet itself, Andreas Lundblad, a Java developer at Palantir, and one of the ...

It's not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.

The Hamcrest 1.3 Javadoc documentation for the Matchers class adds more documentation for several of that class’s methods than were available in Hamcrest 1.2. For example, the four overloaded contains ...