Question

Write a recursive method that counts the number of vowels in a string. It must return the number of vowels. Use appropriate parameters as needed. Hint: There's an ArrayList method called contains that might make checking whether a character is a vowel easier.

Answer 1

static int vowelCount(ArrayList<Character> list, int start){
    if(start<list.size()){
        char ch = list.get(start);
        if(ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' || ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U'){
            return 1+vowelCount(list,start+1);
        }
        else{
            return vowelCount(list,start+1);
        }
    }
    return 0;
}