FAQ: Graphs: Java - Graph Review

Frequently Asked Questions Java FAQ
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This community-built FAQ covers the “Graph Review” exercise from the lesson “Graphs: Java”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Pass the Technical Interview with Java

FAQs on the exercise Graph Review

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In question 4, I noticed that the .removeVertex method for a Graph object removes the vertex from the list of vertices,
but it does not remove the edges that go to the removed vertex.

Here’s a possible fix:

    public void removeVertex(Vertex vertex) {
        this.vertices.remove(vertex);
        for (Vertex otherVertex : this.vertices) {
            otherVertex.removeEdge(vertex);
        }
    }

But its not efficient, because it iterates through all vertices and the edges in the graph to find the ones that need to be removed.