How do I use JDK 7 on Mac OSX?

Question

I would like to use the WatchService API as mentioned in this link: http://download.oracle.com/javase/tutorial/essential/io/notification.html

After reading around, I

Answer 1

after installing the 1.7jdk from oracle, i changed my bash scripts to add:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_13.jdk/Contents/Home

and then running java -version showed the right version.