// Fig. 21.13: TotalNumbersErrors.java
// Summing the elements of an ArrayList.
import java.util.ArrayList;

public class TotalNumbersErrors
{
   public static void main( String[] args ) 
   {
      // create, initialize and output ArrayList of Integers 
      // then display total of the elements 
      Integer[] integers = { 1, 2, 3, 4 }; 
      ArrayList< Integer > integerList = new ArrayList< Integer >();

      for ( Integer element : integers ) 
         integerList.add( element ); // place each number in integerList

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

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