method that reads a string for vowels?

[Mike Pirrone]

I am to create a program that asks the user to enter a string in any combination. Once the string is entered the number of each vowel in the string is outputed as well as the remaining nonvowel characters (including spaces). I pseudocoded and planned out how I am going to do the program. My only question though, how do I compare the string to my case structure that will have a separate counter for each vowel and the remaining characters. Is there a method in Java I can use? Thanks so much.
-mike-

[Thomas Paul]

I'm not sure I'm getting what you mean.
Do you mean, how do I extract each character in the String to compare to the individual vowels? If so, you can use the String.charAt(int). If not, can you explain in a little more detail what you are asking for?

[Mike Pirrone]

my apologies. This is for my OOP class at UNF in jax, fl.
the program asks the user to enter a string . for example, lets say i enter "Hello World". The program would out put there are 0 A's, 1 E, 0 I's, 2 O's, 0 U's, and 8 other characters (including spaces). does that help ? thanks
-mike

[Thomas Paul]

String.charAt with a switch would be perfect. Just put it in a for loop and that should fly.

[Mike Pirrone]

thank you i really appreciate it. ill keep you updated on my progress.
-mike-

[Max Habibi]

IF you're using jdk 1.4, it's as easy as

Pattern p = Pattern.compile("a|e|i|o|u",Pattern.IGNORE_CASE);
Matcher m = p.matcher("Hello World");
while (m != null & m.find()){
System.out.println(m.group());
}

ps - this is of the top of my head, so case/spelling may be off, but it's the general idea.
HTH,
M, author
The Sun Certified Java Developer Exam with J2SE 1.4

[Mike Pirrone]

i wish i could do it that easily but our professor is requiring us to use a switch statement and a while statement. thats an awesome way to do it though. i wish i could.

[Mike Pirrone]

i have everything up and running smoothly but just one problem. for my user output it will output how many of each vowel/characters there are after each individual character.
for example if i enter "AEIOU" I will get
1 A 0 E 0 I 0 O 0 U 0 other characters
0 A 1 E 0 I 0 O 0 U 0 other characters
0 A 0 E 1 I 0 O 0 U 0 other characters
0 A 0 E 0 I 1 O 0 U 0 other characters
0 A 0 E 0 I 0 O 1 U 0 other characters
I want the output to occur for the entire string on one line. here is my code for the for loop with the switch.

  for(int i = 0; i < phrase3.length(); i++)
{
            int aCount = 0;
            int eCount = 0;
            int iCount = 0;
            int oCount = 0;
            int uCount = 0;
            int xCount = 0;

            switch(phrase3.charAt(i))
            {
             case 'A':
     aCount = aCount + 1;
     break;
     
             case 'E':
     eCount = eCount + 1;
     break;
     case 'I':
             iCount = iCount + 1;
     break;
     case 'O':
     oCount = oCount + 1;
     break;
     case 'U':
     uCount = uCount + 1;
     break;
     default:
     xCount = xCount + 1;
   }
   System.out.print(+aCount+ "A ");
           System.out.print(+eCount+ "E ");
   System.out.print(+iCount+ "I ");
           System.out.print(+oCount+ "O ");
           System.out.print(+uCount+ "U ");
           System.out.println(+xCount+ "other     characters ");
}

im not asking for anyone to code for me, just wanting to know where I am going wrong. My first guess was that as the variable i was incremented in the for loop it printed out the statments each time it was incremented in the loop. So I tried putting the statements outside the for loop but when I did that, it said it did not regonize the counters. thanks for any help
-mike-

[Mike Pirrone]

ok i figured it out! wow, you dive into something and you don't want to stop. I started this thing about 4 hours ago and finally figured everything out and the program is up and running perfect. thank you so much for helping me out javaranch! i greatly appreciate it.
-mike-