java - Predicting Enemy Movement

Well I have a simple 2D game where all positions are defined by and X and Y coordinate.

There are objects moving at a constant velocity. And a turret fires a bullet at the X and Y coordinates of the object. By the time the bullet goes to the desired area, the object has already moved.

So i need to adjust the X and Y target positions for the turret to shoot at taking into account the bullet speed and object speed.

Here's an image showing the problem.