Java how to count the number of words in string

/**
 * @author lautturi.com
 * Java example: count number of words in Java string
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args)  {

		String str = "hello lautturi java world!";
        int count = 1;
 
        for (int i = 0; i < str.length() - 1; i++)
        {
            if ((str.charAt(i) == ' ') && (str.charAt(i + 1) != ' '))
            {
                count++;
            }
        }
        System.out.println("Number of words in the string : " + count);

	}
}

output:

Number of words in the string : 4