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 potential trap in this post.

Oracle issued an emergency update to its widely-used Java web software on Sunday, but experts say it still contains security flaws.

When using Java’s Map implementations, it is sometimes common to invoke the Map ‘s get (Object) method and to react differently based on whether the value returned is null or not.