Week 6: Methods of OO Programming/01B. Class StringHelper

Write a class StringHelper, which has the following static methods:
int countVowels(String string), which returns the number of vowels in the given string
int countOthers(String string), which returns the number of all other characters except vowels in the given string
You can assume that all processed strings only contain lowercase letters.




import java.util.Random;

public class Test{
    public static void main(String[] args){
        final Random r = new Random();
    
        String[] words = ("john alphabets hellothere cheerio hi" +
                "open aaaaeeeeiiii grrrrr").split(" ");
        for (String word : words) {
            System.out.println("Testing with word " + word);
            System.out.println("Vowels: " + StringHelper.countVowels(word));
            System.out.println("Others: " + StringHelper.countOthers(word));
        }  
    }
}





//ADD
class StringHelper {
    public StringHelper() {}

    // STATIC METHOD1
    public static int countVowels(String string) {
        int count = 0;
        for (int i = 0; i < string.length(); i++) {
            if (string.charAt(i) == 'a' ||
                string.charAt(i) == 'e' ||
                string.charAt(i) == 'i' ||
                string.charAt(i) == 'o' ||
                string.charAt(i) == 'u') {
                count++;
            }
        }
        return count;
    }

    // STATIC METHOD2
    public static int countOthers(String string) {
        int count = 0;
        for (int i = 0; i < string.length(); i++) {
            if (string.charAt(i) != 'a' &&
                string.charAt(i) != 'e' &&
                string.charAt(i) != 'i' &&
                string.charAt(i) != 'o' &&
                string.charAt(i) != 'u') {
                count++;
            }
        }
        return count;
    }
}





Testing with word john
Vowels: 1
Others: 3
Testing with word alphabets
Vowels: 3
Others: 6
Testing with word hellothere
Vowels: 4
Others: 6
Testing with word cheerio
Vowels: 4
Others: 3
Testing with word hiopen
Vowels: 3
Others: 3
Testing with word aaaaeeeeiiii
Vowels: 12
Others: 0
Testing with word grrrrr
Vowels: 0
Others: 6