Java Program to count vowels in a string

Let’s say the following is our string −

String myStr = "Jamie";

Set variable count = 0, since we will be calculating the vowels in the same variable. Loop through every character and count vowels −

for(char ch : myStr.toCharArray()) {
   ch = Character.toLowerCase(ch);
   if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
      ++count;
}

Example

Following is an example to count vowels in a string −

 Live Demo

public class Demo {
   public static void main(String[] args) {
      String myStr = "Jamie";
      int count = 0;
      System.out.println("String = "+myStr);
      for(char ch : myStr.toCharArray()) {
         ch = Character.toLowerCase(ch);
         if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
            ++count;
         }
      }
      System.out.println("Vowels = "+count);
   }
}

Output

String = Jamie
Vowels = 3