1  import java.awt.*;
  2  import java.util.*;
  3  
  4  /**
  5     A simple graph with round nodes and straight edges.
  6  */
  7  public class SimpleGraph extends Graph
  8  {
  9     public Node[] getNodePrototypes()
 10     {
 11        Node[] nodeTypes =
 12           {
 13              new CircleNode(Color.BLACK),
 14              new CircleNode(Color.WHITE)
 15           };
 16        return nodeTypes;
 17     }
 18  
 19     public Edge[] getEdgePrototypes()
 20     {
 21        Edge[] edgeTypes = 
 22           {
 23              new LineEdge()
 24           };
 25        return edgeTypes;
 26     }
 27  }
 28  
 29  
 30  
 31  
 32