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I'm trying to do this too, but I can't figure out where to put the strings. I need a category dataset, so I guess I use DefaultCategoryDataset, and the addValue for that uses a double ... where do the Strings go?

I guess this is a stupid question, but how do I get data points to show? I did a createXYLineChart and it makes a line, but it doesn't show the points. I've tried for hours but I have no idea how to make it show the points.