Totaling the numbers in a generic ArrayList - Java Collection Framework

Java examples for Collection Framework:ArrayList

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Description

Totaling the numbers in a generic ArrayList

Demo Code


import java.util.ArrayList;

public class Main
{
   public static void main(String[] args) 
   {/* ww w . j  a va2 s.c o  m*/
      Number[] numbers = {1, 2.4, 3, 4.1}; // Integers and Doubles
      ArrayList<Number> numberList = new ArrayList<>();

      for (Number element : numbers) 
         numberList.add(element); // place each number in numberList

      System.out.printf("numberList contains: %s%n", numberList);
      System.out.printf("Total of the elements in numberList: %.1f%n", 
         sum(numberList));
   }

   // calculate total of ArrayList elements
   public static double sum(ArrayList<Number> list)
   {
      double total = 0; // initialize total

      // calculate sum
      for (Number element : list)
         total += element.doubleValue();

      return total;
   } 
}

Result


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