// Fig. 21.13: TotalNumbers.java
// // Totaling the numbers in an ArrayList<Number>.
import java.util.ArrayList;

public class TotalNumbers
{
   public static void main( String[] args ) 
   {
      // create, initialize and output ArrayList of Numbers containing 
      // both Integers and Doubles, then display total of the elements 
      Number[] numbers = { 1, 2.4, 3, 4.1 }; // Integers and Doubles
      ArrayList< Number > numberList = new ArrayList< Number >();

      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 ) );
   } // end main

   // 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;
   } // end method sum
} // end class TotalNumbers

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