Yeah guys sorry i know i used try-catch in order to do this but it was just to solve the index out of bounds error any suggestion how to deal with that But to be honest it really helped me understand more about recursion and who knows maybe i'll do the same for other functions

RecursiveStringLength.java

public class RecursiveStringLength {
    static int len(String word, int n) {
        try {
            if(word.charAt(n) == ' ') return n;
            return len(word, n+1);
        } catch(IndexOutOfBoundsException e) {
            return n;
        }
    }

    public static void main(String[] args) {
        System.out.println(len("hello", 0)); // 5
    }
}