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I agree with you. Integer as key is too restricted indeed and finally misleading. Nevertheless, why do you think about the Comparable Interface precisely ? If in XYPlot, you don't use the natural order of the keys to iterate through datasets or renders, I think that Object is simpler and less confus...

Hi, Sorry, I haven't tried yet the new version and I could not for the moment because it will miss a way to iterate through renders or datasets, outside the XyPlot instances. That, because in the logic used, the only way to iterator through them was the assumed fact that the indexes increment from 1...

The java code owns too much characters to be posted. Anyway, i can share by another way if you wish.
Thank you for your work.

David, Thank your for your come back. I understand. I agree with you. It's always better to use native object when it's enough. I have noticed that this way of iterating on dataset is the same for renders and at many multiples places in XYPlot. Not exhaustive, for example : Here : public XYItemRende...

Hello David, I realize there have been a number of changes/improvements in the last builds of jfreechart-fse 1.0-SNAPSHOT version. Most of them are very good. Thank you. Besides, the graphics seems more pretty. Nevertheless, i have a problem with one of those. The XYPlot seems to have fully changed ...