I'm using a PVector in a class I designed to model the operation of a movable bridge leaf. I knew that I would have to be careful using classes within classes because I'm relatively new to OOP. I seem to have gotten most of my problems ironed out, but I still get this Null Pointer Exception.

I have recreated the error in a simpler piece of code below. I figure the problem must be something silly like a missing semicolon or an issue with scope. Either way, web searches and looking through the examples here haven't helped. I have found examples that seem to look the same and work, so I must be missing something fundamental.

All I'm expecting to see with this example is '3' printed in the console output.

Code:

Leaf nearLeaf;

void setup() {
  size(100, 100);
  nearLeaf = new Leaf();
  nearLeaf.display();
}

class Leaf {
  PVector forwardCG;
  
  void Leaf() {
    forwardCG = new PVector(3, 4);
  }
  
  void display() {
    println(forwardCG.x);
  }
} 

Excellent! Thanks so much. I knew it would be something simple like that.