Chapter 10, Problem 1E

Explanation of Solution

  averageVowels method

• The code is

  // Declare method avarageVowels

  public static double averageVowels(ArrayList strList)

  {

          // Define if condition

  if(strList.isEmpty())

  return 0.0;

  // Define variable average

  double average = 0.0;

  // Define variable count

  double count = 0;

  // Execute for loop

  for(int i = 0; i < strList.size(); i++)

  {

      //Define String

  String str = strList.get(i);

  // Execute for loop

  for(int j = 0; j < str.length(); j++)

  {

      //Define character

 char ch = Character.toLowerCase(str.charAt(j));

  if(ch == 'a' || ch == 'e' || ch == 'i'

  || ch == 'o' || ch == 'u')

  {

  count++;

 }

  }

  }

  //Define average and return the variable

  average = (double)count / strList.size();

  return average;

 }

• Here average number of vowel characters is returned.
• If an empty ArrayList is passed, then it returns 0.