Thanks for the question.
Each palette contains multiple palette entry collections where each collection has a palette family. The family can be HorizontalAxis, VerticalAxis, Bar, Line etc. Each of these collections contains palette entries for the for the difference series or data points.
For example, the palette entry collection with a "Bar" family contains 8 palette entries which means 8 different bar series will have their own colors. To add more colors simply add more PaletteEntry objects to the collection.
ChartPalette palette = chart.getPalette().clone();
PaletteEntryCollection collection = palette.entriesForFamily(ChartPalette.BAR_FAMILY);
// Add more entries here
Please write again if you need further assistance.
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