How to automate function according to Array list size

I'm sorry this question header is not 100% correct. Because of that, I'll explain my scenario here.
I created a function to merge 4 data sets into one return format. Because that's the format front-end side needed. So this is working fine now.

public ReturnFormat makeThribleLineChart(List<NameCountModel> totalCount, List<NameCountModel>,p1Count, List<NameCountModel> p2Count, List<NameCountModel> average) {
ReturnFormat returnFormat = new ReturnFormat(null,null);
try {
String[] totalData = new String[totalCount.size()];
String[] p1Data = new String[p1Count.size()];
String[] p2Data = new String[p2Count.size()];
String[] averageData = new String[p2Count.size()];
String[] lableList = new String[totalCount.size()];
for (int x = 0; x < totalCount.size(); x++) {
totalData[x] = totalCount.get(x).getCount();
p1Data[x] = p1Count.get(x).getCount();
p2Data[x] = p2Count.get(x).getCount();
averageData[x] = average.get(x).getCount();
lableList[x] = totalCount.get(x).getName();
}
FormatHelper<String[]> totalFormatHelper= new FormatHelper<String[]>();
totalFormatHelper.setData(totalData);
totalFormatHelper.setType("line");
totalFormatHelper.setLabel("Uudet");
totalFormatHelper.setyAxisID("y-axis-1");
FormatHelper<String[]> p1FormatHelper= new FormatHelper<String[]>();
p1FormatHelper.setData(p1Data);
p1FormatHelper.setType("line");
p1FormatHelper.setLabel("P1 päivystykseen heti");
FormatHelper<String[]> p2FormatHelper= new FormatHelper<String[]>();
p2FormatHelper.setData(p2Data);
p2FormatHelper.setType("line");
p2FormatHelper.setLabel("P2 päivystykseen muttei yöllä");
FormatHelper<String[]> averageFormatHelper= new FormatHelper<String[]>();
averageFormatHelper.setData(averageData);
averageFormatHelper.setType("line");
averageFormatHelper.setLabel("Jonotusaika keskiarvo");
averageFormatHelper.setyAxisID("y-axis-2");
List<FormatHelper<String[]>> formatHelpObj = new ArrayList<FormatHelper<String[]>>();
formatHelpObj.add(totalFormatHelper);
formatHelpObj.add(p1FormatHelper);
formatHelpObj.add(p2FormatHelper);
formatHelpObj.add(averageFormatHelper);
returnFormat.setData(formatHelpObj);
returnFormat.setLabels(lableList);
returnFormat.setMessage(Messages.Success);
returnFormat.setStatus(ReturnFormat.Status.SUCCESS);
} catch (Exception e) {
returnFormat.setData(null);
returnFormat.setMessage(Messages.InternalServerError);
returnFormat.setStatus(ReturnFormat.Status.ERROR);
}
return returnFormat;
}

so, as you can see here, all the formatting is hardcoded. So my question is how to automate this code for list count. Let's assume next time I have to create chart formatting for five datasets. So I have to create another function to it. That's the thing I want to reduce. So I hope you can understand my question.

Thank you.

You're trying to solve the more general problem of composing a result object (in this case ReturnFormat) based on dynamic information. In addition, there's some metadata being setup along with each dataset - the type, label, etc. In the example that you've posted, you've hardcoded the relationship between a dataset and this metadata, but you'd need some way to establish this relationship for data dynamically if you have a variable number of parameters here.

Therefore, you have a couple of options:

• Make makeThribleLineChart a varargs method to accept a variable number of parameters representing your data. Now you have the problem of associating metadata with your parameters - best option is probably to wrap the data and metadata together in some new object that is provided as each param of makeThribleLineChart.
  So you'll end up with a signature that looks a bit like ReturnFormat makeThribleLineChart(DataMetadataWrapper... allDatasets), where DataMetadataWrapper contains everything required to build one FormatHelper instance.
• Use a builder pattern, similar to the collection builders in guava, for example something like so:

class ThribbleLineChartBuilder {
    List<FormatHelper<String[]>> formatHelpObj = new ArrayList<>();

    ThribbleLineChartBuilder addDataSet(String describeType, String label, String yAxisId, List<NameCountModel> data) {
        String[] dataArray = ... ; // build your array of data

        FormatHelper<String[]> formatHelper = new FormatHelper<String[]>();
        formatHelper.setData(dataArray);
        formatHelper.setType(describeType);
        ... // set any other parameters that the FormatHelper requires here

        formatHelpObj.add(formatHelper);

        return this;
    }

    ReturnFormat build() {
        ReturnFormat returnFormat = new ReturnFormat(null, null);
        returnFormat.setData(this.formatHelpObj);
        ... // setup any other fields you need in ReturnFormat

        return returnFormat;
    }
}

// usage:
new ThribbleLineChartBuilder()
 .addDataSet("line", "Uudet", "y-axis-1", totalCount)
 .addDataSet("line", "P1 päivystykseen heti", null, p1Count)
 ... // setup your other data sources
 .build()