When downloading and installing JDK 5.0, it seems that the jdk file and jre file are separate. What is the standard directory location these two should be installed? Should they be in separate locations? I also noticed a jre folder already in the jdk file. I that the java runtime that is used, or is the other folder that is used?
The JDK includes a JRE, but the JRE is also available on its own for client installations that don't need to compile Java code. If you're using the JDK, install it by itself and it will use the JRE included in it.