Differences between JDK and Java SDK

Question

Is there any substantial difference between those two terms?. I understand that JDK stands for Java Development Kit that is a subset of SDK (Software Development Kit). But s

Answer 1

My initial guess would be that the Java SDK is for building the JVM while the JDK is for building apps for the JVM.

Edit: Although this looks to be incorrect at the moment. Sun are in the process of opensourcing the JVM (perhaps they've even finished, now) so I wouldn't be too surprised if my answer does become correct... But at the moment, the SDK and JDK are the same thing.