// CSE 143, Winter 2009, Marty Stepp
// This program contains various methods for manipulating ArrayLists.

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

public class WordJumble {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner input = new Scanner(new File("twister.txt"));
        ArrayList<String> list = readFile(input);
        System.out.println(list);

        capitalizePlurals(list);
        System.out.println(list);
        
        reverse(list);
        System.out.println(list);
    }
    
    // Reads the contents of the given file into an ArrayList and returns it.
    public static ArrayList<String> readFile(Scanner input) {
        ArrayList<String> list = new ArrayList<String>();
        while (input.hasNext()) {
            String word = input.next();
            list.add(word);
        }
        return list;
    }
    
    // Replaces every "plural" word (one that ends in a lowercase "s") in the
    // given list with an uppercased version of itself.
    public static void capitalizePlurals(ArrayList<String> list) {
        for (int i = 0; i < list.size(); i++) {
            String word = list.get(i);
            if (word.endsWith("s")) {
                list.set(i, word.toUpperCase());
            }
        }
    }
    
    // Reverses the order of the elements in the given list.
    public static void reverse(ArrayList<String> list) {
        for (int i = 0; i < list.size() / 2; i++) {
            // swap element i with element (size - 1 - i)
            int i2 = list.size() - 1 - i;
            String temp = list.get(i);
            list.set(i, list.get(i2));
            list.set(i2, temp);
        }
    }
}