New to Java

These are the steps I took to install Java on Ubuntu 10.04LTS:

1. I downloaded jre-7u13-linux-i586.tar.gz from
http://www.java.com/en/download/linux_manual.jsp?locale=en

2. I read the instructions here:
http://www.java.com/en/download/help/linux_install.xml#Java%20for%20Linux%20Platforms

3. I entered these commands:
sudo mkdir /usr/java
cd /usr/java
sudo mv /home/sitara/Downloads/jre-7u13-linux-i586.tar.gz /usr/java
sudo tar zxvf jre-7u13-linux-i586.tar.gz

4. Instructions say this:
Unpack the tarball and install Java
tar zxvf jre-7u7-linux-i586.tar.gz

The Java files are installed in a directory called jre1.7.0_07 in the current directory.
In this example, it is installed in the /usr/java/jre1.7.0_07 directory.
When the installation has completed, you will see the word Done.
Delete the .tar.gz file if you want to save disk space.
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My question is:

Once jre-7u7-linux-i586.tar.gz has been uncompressed, what else needs to be done?
I did not see the word "Done".
The program is uncompressed but not installed at that point, correct?
The instructions do not say what command should be entered to run the installer.
In my case would that be:
sudo /usr/java/jre1.7.0_13/bin/java
???