The Graphics object, g, will be used to add different graphic objects to our panel. This is the method that will draw out objects. By extending this, you are required to add the paintComponent(Graphics g) method. The setup of your project is similar to before, except now your class is going to extend the abstract JPanel class. This tutorial is not going to go in-depth on Java Swing objects, but it does look at how to create a Java Swing Canvas and draw an object, in this case, a circle. Like the other Swing tutorials, you will still be starting with a JFrame, but this tutorial used a few different methods to help create the paint objects and mouse events. This tutorial takes a different direction looking at drawing objects and mouse events on a graphical canvas. All rights reserved.In other Java Swing tutorials, you saw how to create an app using buttons and button events. If you're unable to launch this application, you should checkġ995-2005 Sun Microsystems, Inc. The application is then downloaded, and you should see this: You should see a Java Web Start splash screen, To test whether your browser can launch an application using Java Web Start, When you install a version of the Java platform with Java Web Start, on most platforms you’ll see a Java Web Start shortcut on your desktop. So, if you have J2SE or JRE v1.4.1 or higher, you already have Java Web Start installed. In 1.4.1 and later releases of the Java platform, Java Web Start is shipped as part of the platform. Java Web Start checks for updates each time you run a remote application and downloads any updated files automatically. It then caches them on your computer so the application can be quickly relaunched from a desktop shortcut or from a Web browser. The first time you launch an application, Java Web Start automatically downloads all necessary files. With a click on a Web page link, you can launch full-featured applications without a complicated download and installation process. Java Web Start is a technology that simplifies the distribution of applications. C:\java\lnfdir\newlnf.jar HelloWorldSwingĪlternatively, you can launch your program from a Web browser using Java Web Start. Solaris/Linux java -classpath.:/home/me/lnfdir/newlnf.jar HelloWorldSwing For example:įor programs that use a nonstandard look and feel or any other nonstandard code package, you must make sure that the necessary classes are in the class path. Assuming that your program uses a standard look and feel such as the Java, Windows, or GTK+ look and feel you can use the interpreter to run the program without adding anything to your class path. Another installation troubleshooting guide for the Java 2 platform is online at:Īfter you compile the program successfully, you can run it. Getting Started trail to help you solve any compiling problems you encounter. Another common mistake is installing the Java Runtime Environment (JRE) and not the full Software Development Kit (SDK) needed to compile these programs. Once you’ve updated your SDK, you should be able to use the programs in this trail without changes. If you can’t compile, make sure you’re using the compiler in a recent release of the Java platform. Your next step is to compile the program. When you save this file, you must match the spelling and capitalization of its name exactly. You can use a simple program we provide, called HelloWorldSwing, that brings up the GUI shown in the figure below. Ĭreate a Program That Uses Swing Components You can download the latest release of the J2SE SDK for free from. Install the Latest Release of the Java 2 Platform
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