Given a location, heading, and a step size, how do I determine the resulting location of the next step?

I would like to develop an application where a cylinder shape moves a constant speed at a given heading over time. The user could update that heading via keyboard input, at which point the cylinder would move in the new heading.

I am having issues with the math of calculating the cylinder's next position. Given a location, heading, and a step size, how do I determine the resulting location of the next step? What are the java 3d classes I should be using to make this calculation?

I presume that much of the work will be done via transform3d instances. The heading might be a transform3d whose heading values could be tweaked by calling the transform3d's rotX, rotY, and rotY methods. The shape object transform would store the current location. How do I calculate the next location after the step?

private void calculateNextStep(TransformGroup shapeGroup, double xAngle, double yAngle, double zAngle, double stepSize) {

        Transform3D shapeTransform = new Transform3D();
        shapeGroup.getTransform(shapeTransform);Transform3D headingTransform = new Transform3D();

        headingTransform.rotX(xAngle);
        headingTransform.rotY(yAngle);
        headingTransform.rotZ(zAngle);


        // how do I apply the stepsize and heading onto the shape?
        // ...
}
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Thanks in advance