About Java install

Hey y'all!
Now I have some Questions.
1 : My OS is 10.7.3. I'm tryin' to install a Java from 10.7 update, then it told me I already installed a new version and stop installing.
Is that mean if I don't do some special work, I can only install current or newer version of Java?
2 : I'm new on Mac. Never seen a Java solo update in "software update". But I saw Java install pkg on Mac "Support Download".
Is Java solo update happens on "software update"?
3 : My OS is a brand new 10.7.3, never run a Java app. I know the Java is not actually installed, just a shortcut of Java Install.
Now I do the software update to 10.7.4. When it's done. Do I have a already installed Java? Or let's say "Does the System Update include Java Install packeg?"
4 : Is the download address of Install packegs in Support Download will be failure? I see only the newest software on it.
Thanks for reading my questions.

The latest Java update for Lion is Java for OS X Lion 2012-004. All Java components EXCEPT the Java Runtime Environment are installed by default. To install the JRE, launch the Java Preferences.app in /Utilities and follow the instructions.

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