Question

how to add unknow numbers of colors to this array ? for example i whant to add 6 colors

int[] colors = new int[] { Color.RED, Color.YELLOW, Color.BLUE,Color.GREEN };

and how to add unknow numbers of categorySeries ? for example i want to add 6 categorySeries

CategorySeries categorySeries = new CategorySeries("Vehicles Chart");
categorySeries.add("cars ", 30);
categorySeries.add("trucks", 20);
categorySeries.add("bikes ", 60);
categorySeries.add("plan ", 40);

thanks in advance

Answer 1

You can’t add unknown numbers of items to an array, because arrays can’t resize.

Use an ArrayList instead:

List<CategorySeries> categorySeriess = new ArrayList<CategorySeries>();
CategorySeries categorySeries = new CategorySeries("Vehicles Chart");
categorySeries.add("cars ", 30);
categorySeries.add("trucks", 20);
categorySeries.add("bikes ", 60);
categorySeries.add("plan ", 40);
categorySeriess.add(categorySeries);

And for the colors:

List<Integer> colors = new ArrayList<Integer>();
colors.add(Color.RED);  // single add
colors.addAll(Arrays.asList(Color.YELLOW, Color.BLUE, Color.GREEN));  // bulk add