import java.util.ArrayList;
public class MainClass {
public static void main(String args[]) {
Integer[] integers = { 1, 2, 3, 4, 5 };
ArrayList integerList = new ArrayList();
for (Integer element : integers)
integerList.add(element);
System.out.printf("integerList contains: %s\n", integerList);
System.out.printf("Total of the elements in integerList: %.0f\n\n", sum(integerList));
Double[] doubles = { 1.1, 3.3, 5.5 };
ArrayList doubleList = new ArrayList();
for (Double element : doubles)
doubleList.add(element);
System.out.printf("doubleList contains: %s\n", doubleList);
System.out.printf("Total of the elements in doubleList: %.1f\n\n", sum(doubleList));
Number[] numbers = { 1, 2.4, 3, 4.1 }; // Integers and Doubles
ArrayList numberList = new ArrayList();
for (Number element : numbers)
numberList.add(element);
System.out.printf("numberList contains: %s\n", numberList);
System.out.printf("Total of the elements in numberList: %.1f\n", sum(numberList));
}
public static double sum(ArrayList list) {
double total = 0;
for (Number element : list)
total += element.doubleValue();
return total;
}
}
integerList contains: [1, 2, 3, 4, 5]
Total of the elements in integerList: 15
doubleList contains: [1.1, 3.3, 5.5]
Total of the elements in doubleList: 9.9
numberList contains: [1, 2.4, 3, 4.1]
Total of the elements in numberList: 10.5