I'm creating a system of nodes, all of which have the option to contain a list of children nodes to which they connect a red line to. For some reason I can use my push function just fine at the root level to add a new node object to the array of "allnodes", but when I attempt to use it from within a method of the Node object to add to the "children" array, it doesn't seem to work.

Code:

Node[] allnodes = new Node[1];

void setup(){
  size(200,200);
  smooth();
  allnodes[0] = new Node(width/2, 20);	
}

void draw(){
  background(0);
  for(int i=0; i<allnodes.length; i++){	
    allnodes[i].draw();			
  }
}

void mousePressed(){
  Node newnode = new Node(mouseX, mouseY);  
  allnodes = push(allnodes, newnode);	 
  allnodes[0].addChild(newnode);	     
}

class Node{
  int x, y;					   
  Node[] children = new Node[0];		
  Node(int x_, int y_){			   
    x = x_;
    y = y_;
  }
  
  void draw(){
    drawChildLines();			     
    ellipse(x, y, 7, 7);			 
  }
  
  void drawChildLines(){
    stroke(255,0,0);
    for(int i=0; i<children.length; i++){
	line(x, y, children[i].x, children[i].y);   
    }
    noStroke();
  }
  
  void addChild(Node newkid){		   
    children = push(children, newkid);	
  }
}

Node[] push(Node[] n, Node element){
  Node[] newn = new Node[n.length+1];	 
  newn[0] = element;				
  System.arraycopy(n,0,newn,1,n.length);    
  println(newn.length);			   
  return newn;					
}

Node[] pop(Node[] n){
  Node[] newn = new Node[n.length-1];	
  System.arraycopy(n,0,newn,0,n.length-1);  
  return newn;					
} 

I'm thinking there is some issue with scope or defining the property as public. I have tried doing so explicity to no affect.