Don't put to much work into getting your arms big ! The arms serve to give you momentum and create the required balance once you get into the jumping position.
You have to understand one aspect of the strength training for track & field or speed sports in general.
If you are center, yes you will need to get some weight on those arms, if you are a forward the same thing but not to much if you are a pg you don't need strong heavy arms muscles.
As for jumping purpose just make sure you have good elasticity in your shoulders with a full range of motion.
Most important when working "arms" in basketball the exercises must be done simulating the game ! - like passing drills with heavy balls or ball awareness drills.
For the vertical jump once you master the movement of clean box jump your arm will learn how to create the required momentum, also you can use light rubber bands to simulate the arms jumping extension.