The Ultimate List of Java Tips and Code Snippets

Java SE Tips / java.awt How to capture screenshot How to use AWT CardLayout How to use Robot class in Java Java Graphics Coordinate System Converting RGB colors into values of hue saturation and intensity How to use Border layout How to use Grid layout How to create Animation: Paint and Thread How to create animation How to create a bouncing ball animation Text animation How to create a Hypnosis Spiral in Java Java SE Tips / java.awt.image How to use PixelGrabber class to acquire pixel data from an Image object Calculation of the mean value of an image Enlarging an image by pixel replication Shrinking an image by skipping pixels How to get average of a set of images Java SE Tips / java.awt.event How to add window listener to the window in Swing What types of Events exist in Swing How to use Action Events in Swing How to use Adjustment Events in Swing How to use Focus Events in Swing How to use Item Events in Swing How to use Key Events in Swing How to use Mouse Events in Swing How to use Mouse Motion Events in Swing How to use Window Events in Swing Java SE Tips / java.lang How to get free available memory in Java program How to write a Java Application without a main method Introducing Annotations Binary Search Implementation in Java Recursive Binary Search Implementation in Java Factorial Implementation in Java Finding Greatest Common Divisor recursively Finding Maximum Contiguous Subsequence Sum using divide-and-conquer approach Insertion Sort Implementation in Java Shell Sort Implementation in Java Heap Sort Implementation in Java Merge Sort Implementation in Java Quick Sort Implementation with median-of-three partitioning and cutoff for small arrays Quickselect Implementation with median-of-three partitioning and cutoff for small arrays Array-based Stack Implementation in Java Array-based Queue Implementation in Java Linked-list Based Stack Implementation Linked-list Based Queue Implementation Linked List Implementation in Java Binary Search Tree Implementation in Java Red-Black Tree Implementation in Java AA-Tree Implementation in Java Priority Queue - Binary Heap - Implementation in Java Character Escape Codes in Java Arithmetic Operators in Java What is garbage collection How can i clear a system property When was Java born What is the difference between JDK and JRE How can I generate a java file from a class file Where can I get the Java Language Specification How can I force garbage collection to take place A program to print limits of the primitive types How to use System class How to use Wrapper classes Difference between Abstract classes and Interfaces Creating Application Specific Exceptions How to use For Each loop How to pass unspecified number of arguments to a method How to implement Cloneable Interface How to use Comparable Interface How to explicitly invoke Garbage Collection in Java How to pass command line argument in a java program How to use System class to copy Array How to use Exception classes to validate Numbers Difference between String StringBuffer and StringBuilder How to use Jar Tool Use of StringBuffer Class Use of ArrayList Class How to Convert an ArrayList into an array Extending Thread class - multithreading concepts Schedule task periodically Use of Finally Clause A tip on conditional operation A small tip on String to avoid NullPointerException Are there any tools out there that will convert a program writen in C to Java What is Java Just in Time Compiler How to use verbose option while running a Java application How to pass reference in a method Use of clone method - cloning objects Java SE Tips / java.text How to internationalize number Java SE Tips / java.lang.reflect How to use Reflection in Java Invoke method using Reflection Java SE Tips / java.net Programmatic Access to Network Parameters How can I send broadcast packets in Java How do I use Java to ping a host How to Detect IP Address and Name of Host machine without using Socket programming How to convert URI to URL Java SE Tips / java.io How to make a file read only through Java program How do I list all drives - filesystem roots - on my system How can I open the same file for reading as well as writing Chaining of Streams How to use Random Access file How to do object Serialization List the names of all files in a particular directory How to Read File in Java How to write file in Java How to convert html file into js file Java SE Tips / java.applet How to Remove Flashing in an Applet How can I read a file from the JAR file of an applet Java SE Tips / javax.xml.parsers How to read XML file in Java Java SE Tips / javax.xml.validation Definitions of attributes Definitions of complex elements and types Definitions of simple elements and types How to create XML validator from XML schema Referencing elements Using validator in SAX interface Using value restricions What is W3C XML schema Java SE Tips / java.util How do I generate a random number between 0 and some integer n How to use HashSet How to use TreeSet How to use of HashMap How to use List interface How to use generic ArrayList How to use StringTokenizer How to read input from console How to read System properties Multi-Lingual Features in Java Application Difference between ArrayList and Vector How to extend LinkedHashMap Java SE Tips / java.util.logging How to use Logger Java SE Tips / java.util.regex How to use regular expression in Java An example of a regular expression search program An example of Regular Expression search and replace program How to apply Regular Expressions on the contents of a file How to create a String pattern matcher How to split Strings with Patterns How to use Matcher class How to find and display hyperlinks contained within a web page Java SE Tips / java.util.zip How to compress a Byte Array How to compress a file in the GZIP format How to create a ZIP File How to decompress a Byte Array How to retrieve a compressed file from a ZIP file How to retrieve the contents of a ZIP file How to uncompress a file in the GZIP format How to read zip file How to write Zip file Java SE Tips / java.beans Reporting Indexed Property Changes in Beans Java SE Tips / javax.imageio How to save a BufferedImage to a PNG file How to list the image formats that can be read and written How to read an Image from a file, inputStream, or URL Java 2D API Enhancements in J2SE 5.0 Java SE Tips / javax.swing How to create Menu Bar How to format and validate input field in Java Swing How to make Split Pane using Swing How to make Tabbed pane using Swing How to use Swing BoxLayout Dialog Modality Drag and drop of a group of files into a tree How to make a Text Field two columns wide How to record mouse-over action on hyperlinks and shows the link in a status bar How to add colored text to the document How to change mouse cursor during mouse-over action on hyperlinks How to implement bracket matcher Program that matches bracket as user edits document How to implement different style options in your application How to implement an undo option for Style manipulation How to implement a document cleaner that maps lowercase letters to uppercase How to implement a fancy caret for your application How to map actions with keystrokes How to implement your own line highlighter How to implement highligting of discontinous string on basis of a delimiter How to implement a pattern matcher for regular expressions How to modify horizontal alignment of text field at runtime How to provide user with an option of choosing a color from a pulldown How to show data in database with a JTable How to create a Confirm Dialog Box How to create an Input Dialog Box How to create a Message Dialog Box How to create an Option Dialog Box How to create a Toolbar How to create a ProgressBar How can I change the default icon on application window - java cup - to my own Java SE Tips / javax.swing.text How to make custom Input Text Formatter in Java Java ME Tips / MIDP Changing screen size of the emulator How to fetch an HTML page How to improve efficiency of your application How to manipulate a data buffer How to receive datagrams in a mobile application How to send a datagram in a network aplication How to use CustomItem How to use Date field How to use HTTP connection instead of a stream socket Creating an Alert Dialog Box Creating an instance of the Form class Java EE Tips / Java Servlet How to get information about the client machine using Servlet How to get information about the Server using Servlet How to get information about user using Servlet How to Push an Applet from a Servlet How to Redirect a Request using Servlet What is Client Pull How to debug a Servlet Java EE Tips / JavaServer Pages How to use Session Scope How to open excel sheet through JSP How to use logical tags in JSP Use of global-forwards tag in JSP How to Access Cookies Set at the Client Side Differences between JSP and ASP How to send e-mail through JSP How to use jsp:forward tag How to get Init parameter Names How to use jsp:include action Bean with Indexed Properties and Accessing Indexed values through JSP Bean tags How to use html:messages tag in JSP How to use JavaBeans and JSP:useBean action in JSP How to get and set the property of a JavaBean class How to forward requests from Servlet to JSP How to use iterate Tag in Struts Framework How the JSP page works Java EE Tips / Enterprise Java Beans Developing Web Services Using EJB 3.0 Document Handling in Web Services Applications Understanding JMX Technology Common tips for Stateless Session Bean Tip for remote methods in Session Bean How to write Finalization Code in Java How to synchronize Session Bean state with the transactions Tip for Remote and Home interfaces of EJB Tips for basic functionality of Entity Bean and its comparison with Session Bean Tips for Entity Bean Internal Functionality Life Cycle Choosing between HttpSession and Stateful session bean ejbActivate and ejbPassivate methods in Stateless Session Bean How to decide when to use Entity Bean or Simple JDBC API Tip to improve performance of Entity Beans using dirty flag How to improve MDB performance by pool size What is an EJB What is a Session Bean What is the Java 2 Platform Enterprise Edition - J2EE What are the main benefits of the J2EE platform What technologies are included in the J2EE platform Inheritance and the Java Persistence API Difference between ear jar and war files How to Look up Object in Local Name Space How to Look up Object in Distributable Name Space How to use SetSessionContext method in Session EJB How to avoid memory leaks while calling Stateless Session Bean What is Timer Services in EJB Framework Behavior of Timer Services in Transactions What is the use of reentrant in Entity Beans Difference between CMP Entity Bean and BMP Entity Bean Where to use BMP over CMP Reasons to isolate data access code from entity bean to a helper class How to write data access code in life cycle methods of a BMP Entity bean How to Cancel Timer Service in different Scenarios How to gather information about Timers How to retrieve all active timers of a Bean How to call Timer Service in different EJB components of a Stateless SessionBean Java EE Tips / Java API for XML Web Services Using JAX-WS-Based Web Services with SSL Writing a Handler in JAX-WS Java EE Tips / Java Architecture for XML Binding What is New in JAXB 2.0 Java EE Tips / GlassFish Using Custom MBeans to Extend the GlassFish Administration System Other API Tips / Struts How to use Struts Framework Other API Tips / NetBeans How to launch a web browser with a specified URL from an action How to use the Diff API in NetBeans How can I develop midlets with NetBeans Other API Tips / Eclipse Where can I find plugins for Eclipse How to add your own comment template in Eclipse How to override a method from a base class using Eclipse How to make WAR file in Eclipse Other API Tips / JDBC How to make JDBC connection How to insert data using JDBC How to retrieve data using JDBC Other API Tips / Ant How to control start and stop of a tomcat application by ant build script Other API Tips / Spring What is Dispatcher Servlet and how to configure Dispatcher Servlet of Spring in web.xml file How to configure Definitions used by Particular Dispatcher Servlet of Spring How to write in Spring MVC Framework How to use AbstractController for caching support in Spring What are Command Controllers Spring MVC Framework and its usage How to decide which Command Controller to use for a web application How to decouple view and controller in Spring MVC How to load parameters at application startup in Spring MVC framework How to use Tag Library of Spring How to use SimpleFormController in Spring When to use AbstractWizardFormController in Spring MVC Web Application When to use MultiActionController in Spring framework How to support more than one view resolvers in Spring Why use HandlerInterceptors in Spring How to choose correct type of view resolvers How to use Validator interface for data validation Other API Tips / JOGL What is JOGL How to draw a white rectangle on a black background How to implement a simple double-buffered animation with mouse events How to draw lines in different styles Polygon Stippling in JOGL Vertex Arrays in JOGL How to render a wireframe cube How to use OpenGL modeling transformations Demonstration of arbitrary clipping planes Planets model using modeling transformations How to use composite modeling transformations to draw translated and rotated hierarchical models How to use gluUnProject in JOGL Smooth Shading in JOGL How to use OpenGL lighting model A model with a light which is moved by a modeling transformation Several spheres are drawn using different material characteristics How to use glColorMaterial A scene with different objects and a single light source How to use glBlendEquation in JOGL Several overlapping filled polygons to demonstrate the effect order has on alpha blending results How to intermix opaque and alpha blended polygons in the same scene How to draw anti-aliased lines in JOGL How to use multisampling to draw anti-aliased geometric primitives Demonstration of different types of fog in JOGL The program demonstrating the use of explicit fog coordinates Demonstration of point parameters and their effect on point primitives Demonstration of polygon offset to draw a shaded polygon and its wireframe counterpart How to create a display list in JOGL How to make and execute a display list How to use glCallLists in JOGL How to draw a bitmapped letter on the screen How to draw some text in a bitmapped font using glBitmap Drawing pixels and showing the effect of glDrawPixels, glCopyPixels, and glPixelZoom How to use glColorTableEXT function in JOGL How to use various 2D convolutions filters to find edges in an image How to use the color matrix to exchange the color channels of an image How to compute the histogram of an image using glHistogram function How to determine the minimum and maximum values of a group of pixels using the glMinmax function How to texture map a checkerboard image onto two rectangles Another method of texture mapping a checkerboard image onto two rectangles How to use mipmaps for texture maps Demonstration of using glBindTexture by creating and managing two textures How to draw a texture mapped teapot with automatically generated texture coordinates How to use cube map textures Demonstration of different effects of texture combiner functions Demonstration of the usage of the stencil buffer for masking nonrectangular regions Demonstration of the usage of the accumulation buffer to do full-scene antialiasing on a scene Use of the accumulation buffer to do full-scene antialiasing on a scene Use of the accumulation buffer to create an out-of-focus depth-of-field effect Polygon Tessellation in JOGL Winding Rule Polygon Tessellation Property in JOGL Use of some of the gluQuadric* routines How to draw a Bezier curve using evaluators How to render a mesh Bezier surface using two dimensional evaluators Use of evaluators to generate a curved surface and automatically generated texture coordinates Illustration of the selection mode and name stack Use of multiple names and picking Another picking example in JOGL Usage of OpenGL feedback in JOGL ArcBall rotation - NeHe Tutorial JOGL Port Vertex buffer objects - NeHe Tutorial JOGL Port 3D lens flare with occlusion testing - NeHe Tutorial JOGL Port Multiple viewports - NeHe Tutorial JOGL Port Introduction to physical simulations - NeHe Tutorial JOGL Port Cel shading - NeHe Tutorial JOGL Port Radial blur and rendering to a texture - NeHe Tutorial JOGL Port Beautiful landscapes by means of height mapping - NeHe Tutorial JOGL Port Loading compressed and uncompressed TGAs - NeHe Tutorial JOGL Port Collision detection - NeHe Tutorial JOGL Port Blitter function, RAW texture loading - NeHe Tutorial JOGL Port Bezier patches - NeHe Tutorial JOGL Port Shadows - NeHe Tutorial JOGL Port Clipping and reflections using the stencil buffer - NeHe Tutorial JOGL Port Morphing and loading objects from a file - NeHe Tutorial JOGL Port Tokens, extensions, scissor testing and TGA loading - NeHe Tutorial JOGL Port Sphere mapping quadrics in OpenGL - NeHe Tutorial JOGL Port Bump mapping, multi texturing and extensions - NeHe Tutorial JOGL Port Line, antialiasing, timing, ortho view and simple sounds - NeHe Tutorial JOGL Port Masking - NeHe Tutorial JOGL Port Particle engine using triangle strips - NeHe Tutorial JOGL Port Quadrics - NeHe Tutorial JOGL Port 2D texture font - NeHe Tutorial JOGL Port Cool looking fog - NeHe Tutorial JOGL Port Texture mapped outline fonts - NeHe Tutorial JOGL Port Outline fonts - NeHe Tutorial JOGL Port Bitmap fonts - NeHe Tutorial JOGL Port Display lists - NeHe Tutorial JOGL Port Flag effect (waving texture) - NeHe Tutorial JOGL Port Loading and moving through a 3D world - NeHe Tutorial JOGL Port Moving bitmaps in 3D space - NeHe Tutorial JOGL Port Blending - NeHe Tutorial JOGL Port Texture filters, lighting and keyboard control - NeHe Tutorial JOGL Port Texture mapping - NeHe Tutorial JOGL Port 3D shapes - NeHe Tutorial JOGL Port Rotation - NeHe Tutorial JOGL Port Adding color - NeHe Tutorial JOGL Port Your first polygon - NeHe Tutorial JOGL Port Setting up an OpenGL window - NeHe Tutorial JOGL Port New Categories in Java Applications Section HTML Editor C to Java Translator New Categories in Java Libraries Section ByteCode Library