// Helene Martin, CSE 143
// Reverses the order of tokens in a file.  Attempts to filter out plural words.

// goal: demonstrate ArrayList usage and challenges.
import java.util.*;
import java.io.*;

public class ReverseFile {
	public static void main(String[] args) throws FileNotFoundException { 
		ArrayList<String> words = readFile("words.txt");
		
		// attempt to remove all words that end with 's'
		// capitalizing them worked well but remove doesn't delete all of them!
		// use the jGRASP debugger to see why
		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--; // one possible fix
			}
		}
		
		System.out.println(words);
		
		printReverse(words);
	}
	
	// Reads a file named fileName and returns an ArrayList containing all the file's
	// tokens in their original order.
	public static ArrayList<String> readFile(String fileName) throws FileNotFoundException {
		Scanner input = new Scanner(new File(fileName));
		ArrayList<String> words = new ArrayList<String>();
		
		while (input.hasNext()) {
			String word = input.next();
			words.add(word);
		}
		
		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));
		}	
	}
}