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

/*
 * Connor Moore
 * June 20, 2016
 *
 * Parses a file, and reprints all lines in the file.
 */
public class FileParser {

  // Notes:
  // translation from array to ArrayList:
  //     String[]          => ArrayList<String>
  //     new String[10]    => new ArrayList<String>()
  //     a.length          => list.size()
  //     a[i]              => list.get(i)
  //     a[i] = value;     => list.set(i, value);
  // new operations:
  //     list.remove(i);     --remove the ith value
  //     list.add(value);    --appends a value
  //     list.add(i, value); --adds at an index
  //     list.clear()        --remove all value
  //     list.toString();    --nice String of the list
  public static void main(String[] args) throws FileNotFoundException {
    // array version of parsing a file
    String[] linesArray = new String[1000];
    Scanner input = new Scanner(new File("data.txt"));
    int lineCount = 0;
    while (input.hasNextLine()) {
      String line = input.nextLine();
      linesArray[lineCount] = line;
      lineCount++;
    }         
    // this loop cannot use linesArray.length as the upper bound
    for (int i = 0; i < lineCount; i++) {
      System.out.println(linesArray[i]);
    }
    System.out.println();

    // ArrayList version of parsing a file
    ArrayList<String> linesList = new ArrayList<String>();
    // reset Scanner at the beginning of a data file
    input = new Scanner(new File("data.txt"));
    while (input.hasNextLine()) {
      linesList.add(input.nextLine());
    }
    for (int i = 0; i < linesList.size(); i++) {
      System.out.println(linesList.get(i));
    }
    System.out.println();

    removePlurals(linesList);
  }
  
  // before the method: lines is an ArrayList containing lines of words
  // that will be processed. Cannot be null.
  // after the method: prints all lines without plural words. Plural words
  // are any word that ends with an "s".
  // Does not modify lines, I promise.
  public static void removePlurals(ArrayList<String> lines) {
    for (int i = 0; i < lines.size(); i++) {
      Scanner line = new Scanner(lines.get(i));
      while (line.hasNext()) {
        String word = line.next();
        if (word.charAt(word.length() - 1) != 's') {
          System.out.print(word + " ");
        }
      }
      System.out.println();
    }
  }
}