DiGraph.java

//Usmerjen graf
 
interface DiGraph {
  public abstract void makenull() ;
  public abstract void insertVertex(Vertex v) ;
  public abstract void insertEdge(Vertex v1, Vertex v2) ;
  public abstract Vertex firstVertex() ;
  public abstract Vertex nextVertex(Vertex v) ;
  public abstract Edge firstEdge(Vertex v) ;
  public abstract Edge nextEdge(Vertex v, Edge e) ;
  public abstract Vertex endPoint(Edge e) ;
  public void printGraph()  ;
}