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Apache Commons
	How to Change the File Date and Time in Java using Commons IO
	Get and Display File Size in a Readable Version using Commons IO
	How to Read File Contents to String using Apache Commons IO

Arrays
	How to Convert an Array to a Collection object
	How to copy an array
	Sorting an Array in Descending (Reverse) Order
	Convert an Array to a List
	Extend the size of an array
	View more...

Collections
	Using Generics to Store Specific Type of Objects in a HashMap
	Convert LinkedList to Array
	Convert a List (ArrayList) to an Array
	Using a Set (or HashSet)
	Using a Queue (or LinkedList)
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Compression
	Extract contents of a zip file
	How to list the contents of a zip file
	How to create a zip file

Database
	Connect to database and call stored procedure
	Using a database transaction with JDBC
	Connecting to a Database - Step by Step
	Connect to a database and read from table

Datatype conversions
	Convert byte[ ] array to String
	Convert String to byte array
	Convert String to Boolean
	Convert Boolean to String
	Convert byte to String
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EJB 3
	Lifecycle Callbacks for Stateful Session Beans
	How to create a Stateful Session Bean
	Remote Business Interfaces for Session Beans
	Lifecycle Callbacks for Stateless Session Beans
	Stateless Session Bean

File I/O
	How to Use a FileFilter in Java to List Files
	How to List Files of a Certain Type using a FilenameFilter
	Get file size
	How to Convert a String to an InputStream in Java
	Read Data from InputStream to a String
	View more...

Graphics Java 2D
	Drawing a Ractangle with rounded corners using Java 2D Graphics API
	Drawing a Ractangle using Java 2D Graphics API
	Drawing a Line using Java 2D Graphics API
	Drawing a String using Java 2D Graphics API

Java Language Fundamentals
	How to Format a Number in Java
	The Java Keywords
	How to Compare Strings in Java
	Measure Time in Nano-Seconds
	Using Varargs in Java
	View more...

JMS
	Creating a TopicConnectionFactory

JPA, Java Persistence API
	A Simple Java Persistence API Entity

Networking
	Sending a POST Request with Parameters From a Java Class
	Downloading a web page using URL and URLConnection classes
	Perform NSLookup with the InetAddress class

Reflection
	Instantiate unknown class at runtime and call the object's methods
	List methods of a class using Reflection
	Invoke methods of an object using reflection

Servlets
	Redirect Servlet Call to Another URL
	Forward Call from a Servlet
	Get Users IP Address
	Get and Set Session Variables in a Servlet
	Get Request Parameters in a Servlet

Small programs
	The Tic Tac Toe Game in Java Code
	Pretty Print SOAP Message and Display the SOAP message in HTML
	Weight Converter, Pound to Kilogram, Ounce to Kilogram
	Java Source Code for The HiLo Game
	How to find and calculate prime numbers

Swing
	Show a message dialog with JOptionPane
	Set Look and Feel for a Swing application
	JLabel with more than one row

Threads
	Setting thread priorities
	How to create a thread

Utility Classes
	How to Compute the Difference Between Two Dates in Java
	Using the StringTokenizer to Split a String
	How to get the Current Week using the Calendar class
	How to get the Current Time in Milliseconds using either Date or Calendar classes
	Get the current TimeZone using the Calendar class
	View more...

Web Services
	Using a Message Handler to alter the SOAP Header in a Web Service Client
	Create a Web Service Client with JAX-WS
	Create a simple Web Service

Tutorials
	Java Language Tutorial

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Java Code Examples, Tips and Articles