I have a MacBook Pro running Snow Leopard; how can I see what version of the Java SDK is installed on my Mac?
On modern macOS, the correct path is /Library/Java/JavaVirtualMachines.
/Library/Java/JavaVirtualMachines
You can also avail yourself of the command /usr/libexec/java_home, which will scan that directory for you and return a list.
/usr/libexec/java_home