JFreeChart create tooltip in ChartPanel

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Most ChartFactory methods include a boolean tooltips parameter. Just look in the source for your factory of choice to see how to instantiate a default tooltip generator suitable for the designated renderer. You shouldn’t need to handle the events yourself.

Addendum: As you are using createXYLineChart, an instance of StandardXYToolTipGenerator is supplied by default. The DEFAULT_TOOL_TIP_FORMAT is {0}: ({1}, {2}); the MessageFormat symbols represent the dataset, series and item, respectively. You can use these symbols in your own generator, as shown in this XYItemLabelGenerator, or you can override generateToolTip() to return anything at all.

Addendum: Here’s an example that shows just the dataset:

XYPlot plot = chart.getXYPlot();
XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer();
renderer.setLegendItemToolTipGenerator(
    new StandardXYSeriesLabelGenerator("Legend {0}"));

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