jmap and application heap size

We are running multiple applications on the same jvms. Trying to find out how much space one application is utilizing. Weblogic 10.3.6 and jdk 1.6u121. I have used jmap -histo <PID>. The output is like:

num     #instances         #bytes  class name

----------------------------------------------

   1:       1610518      305143064  [C

   2:        133075      182485480  [I

   3:       5582115      178627680  java.util.HashMap$Entry

Please confirm for num 1 all instances  together meaning 1610518 instances of class [C take total of 305143064 bytes.

I was thinking to find all classes related to application and add all #bytes.

Would you know if there is any better way?

Thanks

Andrew