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I found a good tutorial to install Java under Ubuntu and I followed the steps under Debian. And it works.

Reference : http://www.cyberciti.biz/faq/howto-ubuntu-linux-install-configure-jdk-jre/

The main steps are ->

Install the Java:

sudo apt-get install sun-java6-bin sun-java6-jre sun-java6-jdk

Setting up:

sudo update-java-alternatives -s java-6-sun
Insert  “/usr/lib/jvm/java-6-sun” in the of /etc/jvm using a text editor.
export JAVA_HOME=/usr/lib/jvm/java-6-sun
export PATH=$PATH:$JAVA_HOME/bin

Testing:

java –version

Create HelloWorld.java ->

public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

javac HelloWorld.java
java HelloWorld

That’s it!!