Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

This is an in-depth java tutorial for beginners. Learn what Java is, how to get started, and how to build basic apps using key concepts!

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 ...

Java is an object-oriented language, and Java constructors are how you create objects. Learn about object creation in this full Java constructor tutorial.

Object-oriented systems are usually partitioned into layers of related responsibilities and only dependencies in one direction are allowed, from higher layers (more specific, less reusable) to lower ...

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.

Learn about serialization in Java with our comprehensive tutorial. We provide examples to help you understand how serialization works.