Use string methods to find and count vowels in a string?

Question

I have this problem for homework (I\'m being honest, not trying to hide it at least) And I\'m having problems figuring out how to do it.

Given the following declarat

Answer 1

This could/should be a one-liner

System.out.println("the count of all vowels: " + (phrase.length() - phrase.replaceAll("a|e|i|o|u", "").length()));

and its String only methods

Answer 2

phrase.substring(i, i++); should be phrase.substring(i, i + 1);.

i++ gives the value of i and then adds 1 to it. As you have it right now, String j is effectively phrase.substring(i, i);, which is always the empty string.

You don't need to change the value of i in the body of the for loop since it is already incremented in for (i = 0; i < length; i++).

Answer 3

Using Collections:

     String word = "busiunesuse";
     char[] wordchar= word.toCharArray();
     Character allvowes[] ={'a','e','i','o','u'};
     Map<Character, Integer> mymap = new HashMap();

     for(Character ch: wordchar)
     {
         for(Character vowels : allvowes)
         {
            if(vowels.equals(ch))
            {
             if(mymap.get(ch)== null)
             {
                 mymap.put(ch, 1);
             }
             else
             {
                 int val = mymap.get(ch);
                 mymap.put(ch, ++val);
             }
            }

         }
     }

     Set <Character> myset = mymap.keySet();
     Iterator myitr = myset.iterator();

     while(myitr.hasNext())
     {
         Character key = (Character) myitr.next();
         int value = mymap.get(key);
         System.out.println("word:"+key+"repetiotions:"+value);


     }


}

}