I probably used the wrong terminology in my description, but here is what I am trying to do.

I want to set up 2 arraylists, one of points, and one of lines. The line class simply refers to 2 points. I've got this working, but I'm not sure I'm using the best syntax. Here is the section I am wondering about:

1.   allPoints.add ( new myPoint (new PVector(random(width),random(height)) ) );
     allPoints.add ( new myPoint (new PVector(random(width),random(height)) ) );
    
     myPoint point1 = (myPoint) allPoints.get(allPoints.size()-1) ;
     myPoint point2 = (myPoint) allPoints.get(allPoints.size()-2) ;
    
     allLines.add (new myLine (point1,point2) );

first I create the points, then I grab them, then I use them to assign the line. Can I do this all in one step?

here is the entire code so you can see it in context. Thanks for any help.

1. 
   ArrayList allPoints;
   ArrayList allLines;
   
   //----------------------------------------------------------------------
   
   class myPoint{
     PVector pos;
    
     myPoint ( PVector _pos){ 
     pos = _pos;
     }
   }
   
   //----------------------------------------------------------------------
   
   class myLine{
     myPoint p1;
     myPoint p2;
    
     myLine (myPoint head, myPoint tail){
       p1 = head;
       p2 = tail;
     }
   }
   
   //----------------------------------------------------------------------
   
   void setup(){
     size(500,500);
     smooth();
     allPoints = new ArrayList();
     allLines = new ArrayList();
   }
   
   void draw(){
     background(128); 
     drawLines();
     drawPoints();
   }
   
   
   //----------------------------------------------------------------------
   
   void mousePressed(){
     allPoints.add ( new myPoint (new PVector(random(width),random(height)) ) );
     allPoints.add ( new myPoint (new PVector(random(width),random(height)) ) );
    
     myPoint point1 = (myPoint) allPoints.get(allPoints.size()-1) ;
     myPoint point2 = (myPoint) allPoints.get(allPoints.size()-2) ;
    
     allLines.add (new myLine (point1,point2) );
   }
   
   //----------------------------------------------------------------------
   
   void drawLines(){
     for (int i = allLines.size()-1; i >= 0; i--) {
       myLine l = (myLine) allLines.get(i);
       line (l.p1.pos.x , l.p1.pos.y,l.p2.pos.x , l.p2.pos.y );
     } 
   }
   
   //----------------------------------------------------------------------
   
   void drawPoints(){
     for (int i = allPoints.size()-1; i >= 0; i--) {
       myPoint p = (myPoint) allPoints.get(i);
       ellipse (p.pos.x , p.pos.y, 10,10);
     }
   }
   
   //----------------------------------------------------------------------