I want to install java so that I can use the android sdk

Using the software centre I installed 'ubuntu restricted extras' (as it says that it includes java). The software centre looks like this has been successful.

In the terminal if I type: java -version
It comes back with....

The program 'java' can be found in the following packages:

* default-jre

* gcj-4.6-jre-headless

* openjdk-6-jre-headless

* gcj-4.5-jre-headless

* openjdk-7-jre-headless

Try: sudo apt-get install <selected package>

Q1) Does this mean Java is not installed?

Q2) Is there a better way to report which type and version of java is installed

Q3) If it is not installed then what could have gone wrong with the installations of 'extras'

Q4) Is there a simple way of installing the latest java runtime? I.e. without having to know what the latest verion of java is and without downloading and unzipping and running scripts but just using the standard add-apt-repository + apt-get install.

Thanks