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To download the Java SDK (it's free), see the Immediate Solutions section "Getting And Installing The Java SDK" .web template There's a lot to learn to become proficient with the Java SDK, but the results are worth it. Java programs come in two main types: applications and applets website template (I'll use the terra program to refer to both applets and applications). As we've seen, applets are Java programs you can download and run in free web template your Web browser, free web templates and they're what have made Java so popular. The major Web browsers have sometimes been slow to web site templates implement the most recent versions of Java, so Sun has taken charge and created a Java plug-in for Netscape Navigator and Microsoft Internet Explorer. The plug-in implements all the latest features of Java as a Netscape plug-in and an internet Explorer ActiveX control. free website template You need less code for applications than applets, so while we're learning Java in;'] this chapter, I'll create Java applications. The applications I'll use will be the simplest- type to Java applications console applications. These are text-based applications- cations you run from the command line (in Windows, this means from the DOS window); they can read and display text. For example, say you have a Java appli* cation named app that prints out the messageIf the first dictum of object-oriented programming is divide and conquer, the second is surely out of sight, out of mind. In Java, object-oriented programming revolves around a few key concepts:

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"Hello from Java!" as the appleti we've just seen does. In this case, the application will display that message in the console.web template For example, here's how to create an application named app,website template which is stored in a file named app.java (don't look at the details too closely right now because we're going to dissect this example in the Immediate Solutions section web site templates I "Writing Code: Creating An Application. When you use the Java compiler, the file app.java is translated into a bytecode free web template file named app.class. The app.class file holds these bytecodes, which is what Java actually reads and interprets to make the program run (bytecode files can be much more compact than the Java code they came from - which means it can be faster to download Java applets than lengthy JavaScript scripts). free website template As we'll see in the Immediate Solutions section "Compiling Code," free website templates you use the Java compiler javac to create the bytecode file for appjava: And as we'll see in the Immediate Solutions section "Running Code" of this chapter, it's the file app.class that you use when you run the application, using the tool named Java (note that you omit the .class part of the app. class filename because Java assumes you'll be running a .class file). classes, data members, inheritance, methods, and objects. The following list summarizes the meanings of these terms: o Class-A template from which you can create objects. The definition of the class includes the formal specifications for the class and any data and methods in it.