umlclass

digraph Boxes {
  // labelfontsize=9;
  node [shape=box,fontsize=10,style=filled,fillcolor=lightblue]
  
  Hash;
  SearchGraph;
  SearchNode;
  State;
  SearchController;
  
  // Vererbung
  Hash -> SearchGraph [arrowhead=none,arrowtail=empty];
  
  // Komposition
  SearchGraph -> SearchNode [arrowtail=diamond,arrowhead=none]
  
  // dependency
  SearchController -> SearchGraph [arrowhead=open, style=dashed]
  
  // Assoziation
  SearchNode -> SearchNode [label="Links",fontsize=9, arrowhead=open, headlabel="0..n", labelfontsize=8];
  
  SearchNode -> State [arrowhead=open];
}