How represent edge weight via JGraphT visualization?

Question

I tried create a Java JGraphT visualization with Weight, for example:

Now I want to change the edge label (ex: (a:b) to its edge weight (ex: 2). I tried to search in Javadoc but didn't see anything. Please help me thank you!

Answer 1

Those edge labels came from the toString method of the edge object. Therefore you may create your own edge class and override the toString method in such a way that it yields the edge weight.

You may create your custom edge like this:

class MyWeightedEdge extends DefaultWeightedEdge {
  @Override
  public String toString() {
    return Double.toString(getWeight());
  }
}

And then create your graph like this which will make the graph create edges as instances of MyDefaultEdge and therefore display just edge weight in the visualization:

SimpleWeightedGraph<String,MyWeightedEdge> graph
  = new SimpleWeightedGraph<String,MyWeightedEdge>(MyWeightedEdge.class);