// Helene Martin, CSE 143
// Reverses the order of tokens in a file and filters out plural words.

import java.util.*;
import java.io.*;

public class ReverseFile {
   public static void main(String[] args) throws FileNotFoundException { 
      ArrayList<String> words = fileToArrayList("words.txt");
      printReverse(words);
      
      for (int i = 0; i < words.size(); i++) {
         if (words.get(i).endsWith("s")) {
            //words.set(i, words.get(i).toUpperCase());
            words.remove(i);
            i--; 
            // since remove shifts values over, we have
            // to be careful to not skip values.  Use jGRASP
            // debugger to see this at work.
         }
      }
      
      System.out.println(words);
   }
 
   // Reads a file named fileName and returns an ArrayList containing all the file's
   // tokens in their original order.  
   public static ArrayList<String> fileToArrayList(String filename) throws FileNotFoundException {
      Scanner input = new Scanner(new File(filename));
      ArrayList<String> words = new ArrayList<String>();
      
      while(input.hasNext()) {
         words.add(input.next());
      }
      
      return words;   
   }
   
    // Prints the Strings in words in reverse order, one per line.
    public static void printReverse(ArrayList<String> words) {
        for (int i = 0; i < words.size(); i++) {
            System.out.println(words.get(words.size() - 1 - i));
        }    
    }   
}