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Linux Newbie Administrator Guide

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8.2.12 Java

javac

java

The Java language compiler and interpreter. Under Linux, both javac and java are actually scripts which call kaffe with appropriate options (try cat /usr/bin/java).

A trivial example for a java "standalone" program. I use my favourite text editor, e.g. kate (in X terminal) to type in the following java code:

/* Comments are marked like in C++

* A java class to display "Hello World"

*/

class HelloWorldApp {

public static void main(String[] args) {

System.out.println("Hello World.") ; // Print "Hello World." followed by a newline

}

}

I save this into a file named try_java.java. Now, I can compile it using:

javac try_java.java

This creates a file called HelloWorldApp.class which contains the "bytecode" (semi-compiled code which requires an interpreter to run). I can run it on the command line using:

java HelloWorldApp

For an example on how to embed a simple java applet into an html web page, have a look at http://java.sun.com/docs/books/tutorial/getStarted/cupojava/unix.html from which my java "standalone" program was borrowed.

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