Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.

Copying objects is a common Java programming operation that has one serious trap. Here's how to avoid copying from an object reference and only copy the instance and values you want.

Many programming languages allow passing objects by reference or by value. In Java, we can only pass object parameters by value. This imposes limits and also raises questions.