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Along with the Java virtual machine (JVM) interpreter and runtime system, a Java compiler is built into the Navigator 2.0 browser. So you can now brew some of your own Java without having to get and set up the complete Java Development Kit (JDK), which can be pretty painful on some computers.
This is a blessing for the many Linux folks who cannot run the port of the JDK because they do not have a system supporting ELF. (ELF [Executable and Linking Format] is supplanting the venerable a.out as the executable file format for Linux. It's a mainstay on Solaris and other System V Release 4 Unix clones and derivatives. Check out the Linux ELF HowTo at http://speedy.redhat.com/LDP/HOWTO/ELF-HOWTO-1.html for more information.)
Step 1. Get and install Navigator 2.0 for your platform. Be sure to read the README file for special platform-specific instructions to make Navigator's Java support work properly. For our purposes, the key element of this step is where moz2_0.zip is placed. On my Linux machine, I put it in /usr/local/netscape/java/classes.
Step 2. Get a copy of the Java Development Kit and extract the java/lib/classes.zip file from it. I put it in with moz2_0.zip in /usr/local/netscape/java/classes for simplicity.
Step 3. Set your CLASSPATH environment variable so that Navigator can find it's "built-in" Java classes along with the Sun Java classes. Be sure to include the "current" directory so you can compile your code as well as use Netscape and Sun .zip file archives. For example:
setenv CLASSPATH .:/usr/local/netscape/java/classes/moz2_0.zip:/usr/local/netscape/java /classes/classes.zip
Step 4. Compile your Java code (applet or application) via:
netscape -java sun.tools.javac.Main [filename].java
(Substitute your Java file's name for "[filename]" above.)
This will translate your Java source code into the Java virtual machine bytecode that is placed into [filename].class.
Step 5. If you compiled a Java application you can run it via:
netscape -java [classname]
(Substitute your application's class name (the one that contains the "main" routine) for "[classname]".)
Step 6. If you compiled a Java applet then you can place it in the appropriate location in your Web server hierarchy and view it by using it in a web page.
You can also view it using the "AppletViewer" by running:
netscape -java sun.applet.AppletViewer [classname]
Unfortunately, using the AppletViewer that way doesn't seem to work on some systems (like my RedHat v2.1 Linux system).
After you've had enough typing practice, you may want to encapsulate step 3 with steps 4-6 in some shell scripts or batch files.
For a Unix system, try something like putting:
#/bin/csh -f setenv CLASSPATH .:/usr/local/netscape/java/classes/moz2_0.zip:/usr/local/netscape/java /classes/classes.zip netscape -java sun.tools.javac.Main
into "javac". Remember to make the script executable and change the "/bin/csh" to the path to where csh lives on your machine. Similarly, we can define the application interpreter and applet viewer by substituting the appropriate netscape line from the steps above.