Vector rotation utility

VectorRotation.java

private static Vector rotateZ(Vector v, double rot)
{
    return new Vector(v.getX() * Math.cos(rot) - v.getY() * Math.sin(rot),
           v.getX() * Math.sin(rot) + v.getY() * Math.cos(rot),
           v.getZ());
}

private static Vector rotateY(Vector v, double rot)
{
    return new Vector( v.getX() * Math.cos(rot) + v.getZ() * Math.sin(rot),
           v.getY(),
          -v.getX() * Math.sin(rot) + v.getZ() * Math.cos(rot));
}

private static Vector rotateX(Vector v, double rot)
{
    return new Vector(v.getX(),
           v.getY() * Math.cos(rot) - v.getZ() * Math.sin(rot),
           v.getY() * Math.sin(rot) + v.getZ() * Math.cos(rot));
}

public static Vector rotate(Vector v, double rotX, double rotY, double rotZ)
{
    return rotateX(rotateY(rotateZ(v, rotZ), rotY), rotX);
}