Source Code in This Chapter

Note: right-click or shift-click on the links to download the associated file. All code is freely available for unrestricted use.

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• AppletTemplate.java Basic template for a Java applet.
• AppletTemplate.html Template for including an applet in an HTML document.
• JavaJump.java A simple applet that loads and displays an image. Uses image Jumping-Java.gif (which should be placed in images subdirectory). See JavaJump.html.
• HelloWWW2.java Illustrates the ability of an applet to read parameters contained in the HTML document (PARAM element containing a NAME-VALUE pair). See HelloWWW2.html.
• HelloWWWObject.html Demonstrates using the HTML OBJECT tag to specify an applet, as the APPLET tag was deprecated in the HTML 4.0 specification. Requires Java 1.3 Plug-In.
• Loading Images
  • JavaMan1.java Applet that loads an image from a relative URL. Uses image Java-Man.gif (which should be placed in an images subdirectory). See JavaMan1.html.
  • JavaMan2.java Illustrates loading an image from an absolute URL. Uses image Java-Man.gif (which should be placed in an images subdirectory). See JavaMan2.html. Note, however, if you download the code and the HTML file to a different server and try to run it unchanged, the applet will fail since it tries to load an image from an absolute URL that referring to corewebprogramming.com. Applets cannot legally access URLs that are not on the machine from which the applet was loaded.
  • JavaMan3.java An application that loads an image from a local file. Uses the following image and two files:
    • Java-Man.gif which should be placed in images subdirectory.
    • WindowUtilities.java Simplifies the setting of native look and feel.
    • ExitListener.java WindowListener to support terminating the application.
  • Preload.java An application that demonstrates the effect of preloading an image before drawing. Specify -preload as a command-line argument to preload the image. In this case, the prepareImage method is called to immediately start a thread to load the image. Thus, the image is ready to display when the user later selects the Display Image button. Uses image Java-Plate-1.jpg
• Controlling Image Loading
  • ImageBox.java A class that incorrectly tries to load an image and draw an outline around it. The problem is that the size of the image is requested before the image is completely loaded, thus, returning a width and height of -1. Uses image surfing.gif (which should be placed in images subdirectory). See ImageBox.html. Duke is a registered trademark of Sun Microsystems, Inc. All restrictions apply. See Sun trademarks and logo policies.
  • BetterImageBox.java An improved version of ImageBox.java. Here a MediaTracker is used to block (wait till the image is completely loaded) before preceding to determine the image size. Uses image surfing.gif (which should be placed in images subdirectory). See BetterImageBox.html. Duke is a registered trademark of Sun Microsystems, Inc. All restrictions apply. See Sun trademarks and logo policies.
  • TrackerUtil.java A utility class that lets you load and wait for an image in a single swoop.

• Java Plug-In 1.3
• Java HTML Converter for transforming an APPLET tag to an OBJECT and/or an EMBED tag
• Java 2D Home Page