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

class Words {
public static void main(String[] args) {

    String str="Hello World this is new";
    str=str.trim();
    int n=str.length();
    char a[]=new char[n];
    str.getChars(1,n,a,0);
    for (int i=0;i