Java Beginner - Counting number of words in sentence

Question

I am suppose to use methods in order to count number of words in the a sentence. I wrote this code and I am not quite sure why it doesn\'t work. No matter what I write, I on

Answer 1

Tested method - handles all inputs

public static void countwords() {
    String s = "  t    ";
    int count = 0;
    int length = s.length()-1;
    char prev = ' ';

    for(int i=length; i>=0; i--) {
        char c = s.charAt(i);
        if(c != prev && prev == ' ') {
            count++;
        }
        prev = c;
    }
    System.out.println(count);
}