Java - ArrayList (Adding Multiple Values)

package collections;

import java.util.ArrayList;
import java.util.Collections;

public class ArrayListTest {

    ArrayList<Data> list;

    ArrayListTest() {

//        list = new ArrayList();
//        list.add("A");
//        list.add("B");
//        list.add("C");
        list = addData();

        for (int x = 0; x < list.size(); x++) {
            //Data data = new Data();
            Data data = list.get(x);
            System.out.println(data.letter + " " + data.number);
        }

    }

    public class Data {

        String letter;
        String number;
    }

    public ArrayList<Data> addData() {
        ArrayList<Data> list = new ArrayList<Data>();

        Data data1 = new Data();
        data1.letter = ("A");
        data1.number = ("1");
        list.add(data1);

        Data data2 = new Data();
        data2.letter = ("B");
        data2.number = ("2");
        list.add(data2);

        Data data3 = new Data();
        data3.letter = ("C");
        data3.number = ("3");
        list.add(data3);

//        for (int i = 0; i < 5; i++) {
//
//            Data data = new Data();
//            data.letter = "Chapter " + i;
//            data.number = "This is description for chapter " + i;
//            list.add(data);
//        }
        return list;
    }

}