1.NEED To add an entry in apt source list
#add-apt-repository “deb http://archive.canonical.com/ lucid partner”

2. INSTALL THE FOLLOWING PACKAGES
#apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk

3. TIME FOR TESTING
#java -version

EXPECTED OUTPUT
java version “1.6.0_03”
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Server VM (build 1.6.0_03-b05, mixed mode)

4.MAKING A SIMPLE PROGRAM

# vi HelloWorld.java

APPEND THE CODE
public class HelloWorld {
public static void main(String[] args) {
System.out.println(“Hello, World!”);
}
}

compile and run it

# javac HelloWorld.java
# java HelloWorld

output
Hello, World!