public TopologicalNode(int nodeID,int x,int y){
  this.nodeID=nodeID;
  nodeName=String.valueOf(nodeID);
  worldX=x;
  worldY=y;
}

public TopologicalNode ( int nodeID , int x , int y ) { this . nodeID = nodeID ; nodeName = String . valueOf ( nodeID ) ; worldX = x ; worldY = y ; }
constructs an new node including world - coordinates .
