Java.lang.NullPointerException problems

Question

I have noticed i cannot make a Point P = new Point(null); it throws this exception. However i have made a function that returns a point, or null, depending on whether two line segments collide. Here is what happens:
this is where the error occours, and where i need to use the method:
if (LineIntersect(variables) != null);
     Point P = new Point(LineIntersect(variables) );
        // do whatever i need
}with the method along the lines of:
Point LineIntersect(variables)
        if (collides)
            Point P = new Point();
               //P = whatever i want....
        else
               return null;
}however i get an java.lang.NullPointerException at
Point P = new Point(LineIntersect(variables) );
and i dont know why, as i am only declairing this if LineIntersect(variables) is NOT null.... I dont think this is a syntax error, will post more code if needed
thanks for the help!

Answer 1

My 0.02c
You are calling the LineIntersect method (should be lineIntersect) twice. Plus that method returns a Point object so no need to use the new operator again. I would do this:
Point p = lineIntersect(variables);
if(p != null) {
    // do something with the Point
}