JGraphT：查找最短路径而不考虑边缘方向

Question

我使用 JGraphT 构建了下图 A->B<-C，如下所示：    DirectedPseudograph<Node, Edge> graph = new DirectedPseudograph<>(Edge.class);    DijkstraShortestPath<Node, Edge> shortestPath = new DijkstraShortestPath<Node, Edge>(graph);    Node bn1 = new Node("1", "A", null);    Node bn2 = new Node("2", "B", null);    Node bn3 = new Node("3", "C", null);    graph.addVertex(bn1);    graph.addVertex(bn2);    graph.addVertex(bn3);    Edge edge1 = new Edge("PART_OF");    Edge edge2 = new Edge("IS_A");    graph.addEdge(bn1, bn2, edge1);    graph.addEdge(bn3, bn2, edge2);但每当我尝试打电话时：shortestPath.getPath(node1, node3);我得到一个空数组，这意味着没有连接。我知道这可能与边缘的方向有关，因为A->B->C工作正常。有没有办法找到路径，而不管A和C之间的边缘的方向如何？

Answer 1

您可以使用无向图类来实现此目的。

Graph<Node, Edge> graph = new DirectedPseudograph<>(Edge.class);

Node bn1 = new Node("1", "A", null);

Node bn2 = new Node("2", "B", null);

Node bn3 = new Node("3", "C", null);

graph.addVertex(bn1);

graph.addVertex(bn2);

graph.addVertex(bn3);

Edge edge1 = new Edge("PART_OF");

Edge edge2 = new Edge("IS_A");

graph.addEdge(bn1, bn2, edge1);

graph.addEdge(bn3, bn2, edge2);

Graph<Node, Edge> undirGraph=new AsUndirectedGraph<>(graph);

ShortestPathAlgorithm<Node, Edge> shortestPath = new DijkstraShortestPath<Node, Edge>(undirGraph);

注意：您可能希望使用 与 a 相对，除非您确实需要多个边/自循环。SimpleDirectedGraphDirectedPseudograph