Although Java lacks a true sizeof () equivalent, the Instrumentation interface introduced with J2SE5 can be used to get an estimate of the size of a particular object via its getObjectSize (Object ...

Value objects are single parameters used to combine a set of objects—in most cases, various parameters supplied for a method call. The parameters describe a large number of attributes, which ...

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.