notes_about_sun_java_jdk_on_feisty_on_linux_basics_2007_w40

tee@uusi:~$ apt-cache search sun java jdk --names-only # multiverse
tee@uusi:~$ sudo apt-get install sun-java6-jdk
tee@uusi:~$ cat HelloWorld.java
public class HelloWorld
{
     public static void main(String[] args)
     {
          System.out.println("Hello, world!");
     }
}
tee@uusi:~$ javac HelloWorld.java
tee@uusi:~$ java HelloWorld

See also: http://en.wikibooks.org/wiki/List_of_hello_world_programs#Java