There is no sense naming multiple commands with the same priority.
For example, assume a device has two softkeys and you want to display 4 commands. It should put the highest ranked command on one of the softkeys. The other key will display something like "menu" where the remaining 3 commands will appear.
Move that same application to a three softkey device and commands 1 and 2 will be visible while 3 and 4 will be under one key called "menu".
It's also possible that the JVM will simply ignore the priorities and put all the commands under a single "menu" key.
All of the above is purely conjecture on what is likely. As Mark pointed out, it's really up to the JVM and there are no guarantees.
I usually make a "static final" called lowPriority and set it to 99. Then I make a highPriority set to 1. When I start defining commands I use expressions like highPriority, highPriority+1, highPriority+2, or lowPriority, lowPriority-1, lowPriority-2, etc.
William Frantz
http://sprintdevelopers.com