This article shows how to use the Apache Commons JXPath component to easily query complex Java object trees for data using the XPath expression language. It covers both basic and advanced features ...

Most Java developers who come from a C/C++ background have probably at one time wished for a Java equivalent of sizeof(). Although Java lacks a true sizeof() equivalent, the Instrumentation ...

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.