Stupid word count problem

Question

Idea of the code is to count the number of times "hat" is typed into the console. When the program sees "PERIOD" it is supposed to end and print out how many times it saw "hat".
here is what I have:
import java.util.Scanner;
public class wordCount {
     public static Scanner keyboard;
     static public void main(String[] arg)
          int numHats = 0;
          keyboard = new Scanner(System.in);
          while(!(keyboard.next().matches("PERIOD")))
               if(keyboard.next().matches("hat")) numHats++;
          System.out.println("Occurances= "+numHats);
          System.exit(0);
}and yet with this input:
super hat awesome
cow pig hat
hat hat pig
hat cow sweet hat hat
PERIODI get this output:
Occurances= 5I know that the problem is with the .next function, that it is skipping some of the hats but I dont know how to fix it...any help? I know it cant be that difficult of a problem

Answer 1

The problem with your code is that each time you invoke keyboard.next(), you jump to the next token. If the input is
hat hat hat
PERIOD
then first hat will be checked if it matches "PERIOD", it does not so the while loop continues. You invoke again keyboard.next() and your token is the second hat. As it matches "hat" your count is now =1.
Again keyboard.next() is invoked in while loop, the current token is the third hat. It does not match PERIOD so we go into the loop and here again keyboard.next() is invoked so our token is PERIOD. It does not match with hat so no incrementing in count. As you can see the app didnt stop because the code is problematic.
use while(keyboard.hasNext()) which iterates you thru every token and then take each token with keyboard.next(). Later see if it matches with "hat" or "period". I'm sure that'll help.