By3andBy5

package By3andBy5;
import java.util.ArrayList;
public class By3andBy5 {
    public static void main(String[] args) {

        final int MAX_VAL = 1000;
        ArrayList<Integer> byThree = new ArrayList<>();
        ArrayList<Integer> byFive = new ArrayList<>();
        int sum = 0;

        for(int i = 1; i < MAX_VAL; i++){
            if (i % 3 == 0){
                boolean add3 = byThree.add(new Integer(i));
        }else if (i % 5 == 0){
                boolean add5 = byFive.add(new Integer(i));
        }
        }

        System.out.println("Counting by 3's:");
        System.out.println();
        for(int by3 : byThree){
          sum = sum + by3;
         System.out.print(by3 + " ");
        }
        System.out.println();
        System.out.println();

        System.out.println("Counting by 5's:");
        System.out.println();
        for(int by5 : byFive){
          sum = sum + by5;
         System.out.print(by5 + " ");
        }

        System.out.println();
        System.out.println();
        System.out.println("If you add the elements of the first array"
                            + " with the elements from second array, \n"
                            + "the sum of their respective values is equal to: "
                            + sum);
        System.out.println();
    }
    }