[Jung-support] [Open Discussion] Change node color permenantly on click

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The following forum message was posted by idevc at http://sourceforge.net/projects/jung/forums/forum/252062/topic/8207132:

Consider this code called when clicking a button in an interface I am wrapping
around the graph using JUNG:

    public void actionPerformed(ActionEvent e) {
        String action = e.getActionCommand();
        if(action.equalsIgnoreCase("case.r")){
            nodesSelected.add(currentNodeSelected);
            Transformer<MyNode,Paint> vertexColor = new Transformer<MyNode,Paint>()
{
            public Paint transform(MyNode i) {
                if(i.getID() == currentNodeSelected.getID()){
                    return Color.YELLOW;
                }else{
                    return Color.RED;
                }

            }
            };
            panel.getRenderContext().setVertexFillPaintTransformer(vertexColor);
        }
    }

where currentNodeSelected is of type MyNode (containing an ID of type int which
can be retrieved using getID() and String). This code works i.e. when I click
the button, the node that was selected changes color. However for the life of
me I cannot figure out how to force the node to stay that color. In the above
example it is easy to see why: if the node currently selected is different then
the node changes color. I thought I could remedy this by maintaining a vector
of nodes selected (nodesSelected) and simply loop over them to change the color.
However, that somehow doesnt work either. Now all nodes changes color.

So my question: How can I, after clicking on a node and subsequently a button,
change the color of the selected node and have that node keep that color even
when selecting other/new vertices.

Thanks in advance