| A 3D Exploration of the HTML Canvas Element |
| A Server-Side Assist for Loading Client-Side JavaScript Code |
| Active Links / Rediscover (and Structure) CGI with a Simple Link Technique |
| An Easy JDBC Wrapper |
| Applet Terminals |
| Asynchronous Event Handling |
| Blocking Queue |
| Build a Reflection-based Interpreter in Java |
| Build a Simple WYSIWYG Web Page Editor (Build-a-Page) |
| Build an Embedded Array Language in Java |
| Build your own Java library |
| Building a Java Chat Server |
| Create BitInputStream and BitOutputStream Classes |
| Creating a Custom Java Console |
| Creating a More Responsive User Interface in JavaScript |
| Creating a Single-Instance Server |
| Creating modular interactive user interfaces with JavaScript (Rearrange Your Page) |
| Cross the Gap Between PHP and Java |
| Double-Buffer Applet |
| Emacs a top-notch Java IDE? You bet! |
| Enable Cross-platform File Locking with a Lock Server |
| Encrypted Class Files |
| Encrypted Preferences in Java |
| Floating Applet |
| Getting started with new I/O (NIO) |
| How to lock down your Java code (or open up someone else's) |
| Implement a Browser Command Line with JavaScript |
| Inter-applet Communication |
| JDK 1.5 Preview: Addition of Generics Improves Type Checking |
| Java Web Start: One-Touch Application Deployment |
| Minimize Java Distributions with an Automated, Custom JAR File |
| MultiApplet |
| PHP Source Filtering: Adding New Features to PHP Using Source Filtering |
| Passing Objects Between Threads |
| Perl-like Data Structures in Java |
| Set Up a Certification Authority for Java-based Systems |
| Simulating 'select' |
| Simulating Weak References In Java |
| Store objects using the Preferences API |
| String-Caching a Message Protocol |
| Support Any Image Format with the JDK 1.4 ImageIO Library |
| The Persistent Hashtable: A Quick-and-Dirty Database |
| Thread pool |
| Three Java Variants Extend the Language |
| Understanding the Java ClassLoader |
| Use Callbacks to Isolate Concurrency Bugs |
| Use select for high-speed networking |
| User annotations in Ajax (Yellow Stickies) |
| Using JSSE for secure socket communication |
| Using RPM |
| Write Efficient Java Apps Using Native Data Structures with JNI |
| Writing Data Safely with the CKPTFile Class |
| Writing a Seamless Looper in Java, Part 1: Playing Audio |
| Writing a Seamless Looper in Java, Part 2: Playing Audio |
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| Creating a More Responsive User Interface in JavaScript |
| Learn how to increase the perceived responsiveness of a complicated user interface
using JavaScript. This is the earliest article I know of about the
technique that came to be called AJAX.
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| Active Links / Rediscover (and Structure) CGI with a Simple Link Technique |
| CGI is the most widely used protocol for Web programming, but it doesn't check types or variable declarations and doesn't have function calls. You can work around these weaknesses by encoding function calls directly into Web links easily creating active links—and you can do it in PHP, Perl, JavaScript, and Java.
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| Applet Terminals |
| Find out how to have Applets with Multiple Locations on a Page.
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| Asynchronous Event Handling |
| Get rid of nasty applet pauses.
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| Implement a Browser Command Line with JavaScript |
| AJAX techniques offer sophisticated GUIs on the web, but sometimes you
need to execute commands at the command line. This article
demonstrates how to build a custom command line you can add to your
user interface -- and even get a free run-time scripting engine.
while it's executing a main program file. Implementing an include
directive on the server side is a simple technique for getting around
this limitation.
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| Create BitInputStream and BitOutputStream Classes |
| Although the JDK 1.4 has many Stream classes, it doesn't contain
classes for reading and writing single bits. Extend your tool set by
creating these BitInputStream and BitOutputStream classes.
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| Blocking Queue |
| In a multi-threaded environment, the blocking Queue is a basic technique with broad
applications. This article shows you what it is for, and how it is implemented. |
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| Build a Simple WYSIWYG Web Page Editor (Build-a-Page) |
| Explore a simple Asynchronous JavaScript + XML (Ajax) system that lets
your users assemble pages by adding and arranging pre-made
widgets. Many sites provide this kind of functionality, but this
easy-to-use system lets you do it on your own site and provides a
simple library for creating new widgets.
This article describes a simple system that lets users of your Web
site build their own Web pages. With it, they can place text and
images on their page, arrange them to their liking, and save their
work. The code in this article stands alone, without any third-party
libraries. It's not necessarily what you would want to do in a
real-world environment, but it covers a lot of ground for
investigating implementation techniques.
Check out my
podcast about this article.
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| Use Callbacks to Isolate Concurrency Bugs |
| By restricting all object data access to a callback mechanism, a Java
server can contain all concurrency issues in a single place, making it
much easier for you to see if concurrency constraints have been
violated.
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| Set Up a Certification Authority for Java-based Systems |
| A certification authority can provide authenticating certificates, which enable secure Web transactions in a system of trust that doesnt require any pre-built software or commercial services.
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| Building a Java Chat Server |
| In this tutorial, you'll build a simple, centralized, connection-oriented Java server. In
doing so, you'll learn a basic framework that you can use when creating such a
server, using time-honored techniques that work well in many situations. |
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| Writing Data Safely with the CKPTFile Class |
| Making changes to memory-mapped files is a delicate operation, but far
from impossible. Learn how to make safe, atomic changes to
memory-mapped files using a checkpoint system that will leave your
applications fast and robust and your data impervious to corruption.
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| Understanding the Java ClassLoader |
| This tutorial will teach you what a ClassLoader is, and why it is a
crucial part of the Java virtual machine. It will also teach you how
to create a custom ClassLoader, allowing you to extend the
functionality of the JVM in powerful ways.
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| Build a Reflection-based Interpreter in Java |
| Java's support of reflection enables you to create an interpreter that executes commands interactively. This article demonstrates how to build a reflection-based system that allows simple scripting of Java programs without having to install a special-purpose scripting language. It also provides a downloadable sample program.
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| Creating a Custom Java Console |
| This article will tell you how to create your own browser console, some of the pitfalls
you may encounter, and a few other interesting tidbits. |
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| Build an Embedded Array Language in Java |
| This article describes a generalized system for dealing with
multidimensional arrays of data. It lets you transform and extract
slices of data along various axes with very little code, in the style
of the programming language APL. And you're not limited to numerical
data; you can generalize systems such as this to any kind of tabular
data.
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| Double-Buffer Applet |
| Get rid of that annoying flicker in graphics-intensive applets!
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| Encrypted Class Files |
| With a decompiler, anyone can look inside your code
and use it for their own purposes. Fortunately, the very flexibility that makes Java easy to steal also makes it relatively
easy to protect using encryption.
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| Encrypted Preferences in Java |
| This article considers the technique of automatically encrypting data before storing it in the preferences database. This permits applications to use the Preferences API even for sensitive data, such as passwords and personal information.
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| Floating Applet |
| Get your applet off the page and into its own window!
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| JDK 1.5 Preview: Addition of Generics Improves Type Checking |
| Generics is one of the hottest features of the upcoming JDK 1.5
release. This article describes the new generics feature by
investigating the example pre-release implementation provided by
Sun. You'll use the generics feature to create an extensible
multimedia application, and show how generics make the code simpler.
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| A 3D Exploration of the HTML Canvas Element |
| The HTML Canvas, an element of the upcoming HTML 5 specification,
allows you to efficiently draw arbitrary graphics at the primitive or
individual pixel level. Find out how to implement a 3D rendering using
the HTML Canvas.
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| Support Any Image Format with the JDK 1.4 ImageIO Library |
| Learn to design and implement a load/save dialog box that can read and
write images in any format.
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| Inter-applet Communication |
| Getting Them to Talk to Each Other. |
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| Minimize Java Distributions with an Automated, Custom JAR File |
| Larger applications frequently get loaded down with a heavy burden of unused library files. Learn to create a custom classloader that automatically builds a JAR file that contains only the classes you need.
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| Emacs a top-notch Java IDE? You bet! |
| Emacs is one of the most popular development environments in the history of
software programming, so it's no surprise that there are a number of excellent Emacs
tools for Java programming. In this article, Greg Travis examines three of the best
tools to alter your Emacs environment into a killer Java-language integrated
development platform -- Java Mode, Hilit Java, and the showpiece, the Java
Development Environment for Emacs. He describes what they do, how to use them,
and how to get them. |
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| Build your own Java library |
| In this free, dW-exclusive tutorial, you will learn how the Java language can help you
make a good, reusable library. The tutorial covers a few key principles of good
library design and presents efficient ways to implement each. To illustrate the
concepts, the tutorial walks through the design of a simple library. |
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| An Easy JDBC Wrapper |
| JDBC provides a powerful, comprehensive interface for accessing databases from Java programs. For smaller projects, JDBC can seem overwhelming, driving some programmers to avoid using a database altogether. This article describes a simple wrapper library that makes basic database usage a snap. You'll find yourself wanting to use JDBC for every program you write.
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| A Server-Side Assist for Loading Client-Side JavaScript Code |
| JavaScript lacks a function for loading and executing a library file
while it's executing a main program file. Implementing an include
directive on the server side is a simple technique for getting around
this limitation.
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| Published by |
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| Using JSSE for secure socket communication |
| This tutorial provides cookbook-style instructions for creating and
installing JSSE encryption keys in a client/server application
environment. When you have completed this tutorial, you will know how
to easily convert any existing client/server application to use
encryption, as well as how to create a secure application from
scratch.
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| Java Web Start: One-Touch Application Deployment |
| Distribute full Java applications to users as easily as you distribute
applets.
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| Enable Cross-platform File Locking with a Lock Server |
| JDK 1.4 now comes with support for OS-level file locking. File
locking, however, does not necessarily work the same on all platforms. A
custom shared file locking server can overcome this obstacle to complete
portability, and should be used for any system that needs reliable,
portable file locking.
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| Writing a Seamless Looper in Java, Part 1: Playing Audio |
| Here are the basics of creating a utility class that can seamlessly play a looped sample
over and over in continuous loops. |
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| Writing a Seamless Looper in Java, Part 2: Playing Audio |
| Here are the basics of creating a utility class that can seamlessly play a looped sample
over and over in continuous loops. |
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| MultiApplet |
| Run Multiple Applets Inside an Applet Window. |
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| Write Efficient Java Apps Using Native Data Structures with JNI |
| Sometimes Java's data structures use too much memory to store the data you need to store. In such situations, you can use the JNI native code interface to access native data structures. Find out how to use the STL in C++ to implement a space-efficient hashtable that works like a regular Java hashtable.
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| Getting started with new I/O (NIO) |
| The new input/output (NIO) library, introduced with JDK 1.4, provides high-speed, block-oriented I/O in standard Java code. This hands-on tutorial covers the NIO library in great detail, from the high-level concepts to under-the-hood programming detail. You'll learn about crucial I/O elements like buffers and channels, and examine how standard I/O works in the updated library.
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| How to lock down your Java code (or open up someone else's) |
| Whether you're patching in code from one of the many open-source libraries on the
Web or making calls to common operating system routines, you inevitably spend
some part of your week crunching code that you didn't write, and for which you may
not have the source. When it comes time to debug this code, you'll need access to a
good Java decompiler and the know-how to use it properly. At the same time, you'll
also want to know how to protect your own code from prying eyes. For that, you
need to know about obfuscation. In this beginner's guide to opening up and locking
down Java code, Greg Travis walks you through the essentials of disassembling,
decompiling, and obfuscating Java code, using examples from popular tools such as
Mocha, HoseMocha, jmangle, and JODE. |
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| Passing Objects Between Threads |
| Describes a simple technique (and some variations) for simple inter-thread
communication. |
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| Perl-like Data Structures in Java |
| Describes a generally useful data structure, inspired by Perl, that has some interesting
uses for Java programming. |
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| The Persistent Hashtable: A Quick-and-Dirty Database |
| Larry Wall, the creator of Perl, once said: "The three principal virtues of a programmer are Laziness,
Impatience, and Hubris." The combination of these virtues is what makes it annoying to have to write
something more than once. And the only way to remove this annoyance is to make yourself a simple
useful library that you can reuse.
This article describes the implementation of a simple library for doing something that many programs
have to do: save data. It's not going to solve all of our data-saving needs, because, regardless of what
some database vendors might tell you, there is no one piece of software that can properly handle
every data-saving situation.
The software we're going to be talking about is called a Persistent Hashtable, and it's going to fill a
specific niche in the world of data-saving, which is a very broad world.
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| Cross the Gap Between PHP and Java |
| Using sophisticated application frameworks to build your network server applications is fine, but sometimes these frameworks are overkill. With a little communications programming between PHP and Java, you can establish an extensible layer that handles the annoying details of creating a custom network protocol.
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| Store objects using the Preferences API |
| The Preferences API -- a lightweight, cross-platform persistence API
introduced in JDK 1.4 -- is designed to store small amounts of data
(string, simple byte arrays, and so on.) and was not intended to be an
interface to a traditional database. It can, however, be effective as
a storage device if your data can be expressed as simple objects. This
article offers an introduction to the API, explains how objects are
stored, demonstrates the process in action, and provides a code
library to do the work.
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| Creating modular interactive user interfaces with JavaScript (Rearrange Your Page) |
| Discover a technique that lets you move sections of a Web page using
drag-and-drop functions. Different aspects of the interactivity are
implemented separately and then composed into a unified whole,
allowing for flexible customization that can make your Web users very
happy.
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| Using RPM |
| No description |
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| Use select for high-speed networking |
| Java uses an extremely elegant input/output (I/O) model, based on the
idea of a stream. A stream is an object that produces or consumes a
string of bytes. Streams can be chained together in conjunction with
filtering routines and extended to handle other kinds of data. The
stream model is very flexible, but not too fast. It's fine for many
applications, but some systems require just about as much speed as the
hardware can handle. Sometimes the stream model won't cut it.
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| Simulating 'select' |
| Learn two different ways to efficiently handle large numbers of InputStreams. |
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| Creating a Single-Instance Server |
| This article shows you how to write a single class file which implements both the
listener and processor portions of a TCP/IP server. |
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| PHP Source Filtering: Adding New Features to PHP Using Source Filtering |
| The technique of source filtering lets you preprocess your code before
execution. This can be really useful if you want to add features to
the language you are using, without having to change the language
itself. Very few languages support this, but PHP is one of them. This
article will take you through the theory and practice of PHP source
filtering, and show some useful examples.
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| User annotations in Ajax (Yellow Stickies) |
| The ability to add notes and comments to your Web site can be a
powerful and attractive feature for users. This tutorial demonstrates
how to implement an Asynchronous JavaScript and XML (AJAX)-based user
annotation system in the form of yellow sticky notes that sit on top
of regular Web page content. The only additional, required
configuration is a back-end Perl script that stores the annotations
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| String-Caching a Message Protocol |
| Learn how to get potentially large savings in the efficience of your custom network
protocol. |
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| Thread pool |
| Under many Java implementations, creating and destroying threads very fast can
drastically reduce performance. Using a Thread Pool can get around this problem. |
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| Three Java Variants Extend the Language |
| Learn about three of the most promising Java variants--how they work, what their
features do, and how you can integrate them into your development environment.
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| Simulating Weak References In Java |
| The current browser implementation of Java does not support Weak References. It
might be added in the future, but until then, you can use this trick to get some of the
useful features now. |
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