Setting an arrows path/velocity

I want to be able to shoot 4 arrows in different directions when I right click something. How would I set the velocity of an arrow to send it in a certain direction? I've looked on the forums and cam't find anything helpful.

Thanks in advance!

 

projectile.setVelocity(x, y, z);

 

First, you have to launch the arrows. (i.e. Arrow arrow1 = player.launchProjectile(Arrow.class).

Then you create a Vector representing the direction you want your arrow to fly to.
Finally, you take the arrow and set it's velocity (arrow1.setVelocity(Vector)

For some more information on calculating the destination, speed and vector, you might find this thread usefull:

http://forums.bukkit.org/threads/precise-arrow-aiming-help-with-vectors.52280/

 

I've tried that, but an error comes up on the method setVelocity(). Says that .sestVelocity() cannot use the parameters (int, int, int)