我正在打印源和目标的每一条边，但是当我在mxgraph java中使用getEdgeCount()时，它们是重复的

Question

我使用下面的函数来显示图中的每条边及其源和目标。然而，我注意到一些边缘不知从哪里冒出来。

public void showEdges()
    {
        Object[] list = graph.getChildVertices(graph.getDefaultParent());
        for(int i=0; i< list.length; i++)
        {
            mxICell vertex = (mxICell) list[i];
            for (int j =0; j<vertex.getEdgeCount(); j++)
            {
                mxICell edge = vertex.getEdgeAt(j);
                String destination =(String) (edge.getTerminal(false)).getValue();
                System.out.println("vertex-" + i + " is connected to " +
                        destination + " with weight " + (String)edge.getValue());
            }
        }
         
    }

我画的是这个链接：https://pin.it/7b0Qh7v

输出：

vertex-0 is connected to 0 with weight 2
vertex-0 is connected to 2 with weight 15
vertex-1 is connected to 2 with weight 17
vertex-2 is connected to 2 with weight 17
vertex-2 is connected to 2 with weight 15

我所期望的是：

vertex-0 is connected to 0 with weight 2
vertex-0 is connected to 2 with weight 15
vertex-1 is connected to 2 with weight 17

有没有解决这个问题的办法？

Answer 1

现在我知道我的代码的问题所在了。方法getEdgesAt(int index)返回所有的边，无论它们是传入的还是传出的，为了让我的方法工作，我只需要传出的边。我将该方法替换为：

    public void getEdges()
    {
        Object[] list = graph.getChildVertices(graph.getDefaultParent());
        for(int i=0; i< list.length; i++)
        {
            mxICell vertex = (mxICell) list[i];
            Object[] edges = graph.getEdges(vertex, graph.getDefaultParent(), false, true, true);
            for (int j =0; j<edges.length; j++)
            {
                String destination =(String) (((mxICell)edges[j]).getTerminal(false)).getValue();
                System.out.println("vertex-" + i + " is connected to " +
                        destination + " with weight " + (String)edge.getValue());
            }
            
        }
    }