I will say that whether you are using JDK 6, 7, or 8 does not matter since these are beginning tutorials. The concepts covered will be applicable to all.
If you want to follow the videos you can download Netbeans (any version is fine) here: https://netbeans.org/downloads/
You can download the JDK (pick your OS) here: http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
NOTE: The audio quality improves with Lecture 15. I started using a new microphone.