Question

See the following ArrayList:

List<Integer> values = new ArrayList<Integer>();
values.add(0);
values.add(1);
values.add(2);
values.add(3);
values.add(4);
values.add(5);
values.add(6);

So we have:

integerList.size(); // outputs 7 elements

I need to show a Google chart as follows:

http://chart.apis.google.com/chart?chs=300×200&chd=t:60,-1,80,60,70,35&cht=bvg&chbh=20,4,20&chco=4C5F2B,BED730,323C19&chxt=y&chxr=0,0,500

To generate its values, I just call

StringUtils.join(values, ","); // outputs 0,1,2,3,4,5,6

It happens it supports up to 1000 pixel width. So if I have many values, I need to split my ArrayList into other ArrayLists to generate other charts. Something like:

Integer targetSize = 3; // And suppose each target ArrayList has size equal to 3

// ANSWER GOES HERE
List<List<Integer>> output = SomeHelper.split(values, targetSize);

What Helper should I use to get my goal?

Answer 1

google-collections has Lists.partition(). You supply the size for each sublist.