import java.util.*;

import java.io.*;

public class LinkedMain
{
	public static void main (String[ ] args) 
	{
     		List<String> aList = new LinkedList<String>();

     		BufferedReader keyboardReader = new BufferedReader
                                         		(new InputStreamReader (System.in)),
                      	       fileReader;

     		String inFilePath,
                       line,
                       word;

     		try
     		{ 
            		System.out.print ("\n\nPlease enter the path for the input file: ");
            		inFilePath = keyboardReader.readLine();
            		fileReader = new BufferedReader (new FileReader (inFilePath));
            		while (true)
            		{
                		line = fileReader.readLine();
                		if (line == null)
                       			break;
                		aList.add (line);
            		} // while not end of file
            		fileReader.close();

            		System.out.print ("\nPlease enter the word you want to search for: ");
            		word = keyboardReader.readLine();
            		if (aList.indexOf (word) >= 0)
                		System.out.println (word + " was found.\n\n");
            		else
                		System.out.println (word + " was not found.\n\n");

            		System.out.print ("Please enter the word you want to remove: ");
            		word = keyboardReader.readLine();
            		int removalCount = 0;            
            		ListIterator<String> itr = aList.listIterator();
            		while (itr.hasNext())
                		if (itr.next().equals (word))
                		{
                    			itr.remove();
                    			removalCount++;
                		} // if another instance of word has been discovered
            		if (removalCount == 0)
                		System.out.println (word + " was not found, so not removed.\n\n");
            		else if (removalCount == 1)
                		System.out.println ("The only instance of " + word + " was removed.\n\n");
            		else
                		System.out.println ("All " + removalCount + " instances of " +
                                                    word  + " were removed.\n\n");

            		System.out.print ("Please enter the word you want to append: ");
            		word = keyboardReader.readLine();
            		aList.add (word);
            		System.out.println (word + " was appended.\n\n");

           		System.out.print("Please enter the word you want to convert to upper case: ");
            		word = keyboardReader.readLine();

            		String currentWord;
            		boolean found = false;
            		itr = aList.listIterator();
            		while (itr.hasNext() && !found)
            		{
                		currentWord = itr.next();
                		if (word.equals (currentWord))
                		{
                    			itr.set (word.toUpperCase());
                    			System.out.println (word + " was converted to upper case.\n\n");
                    			found = true;
                		} // found word to convert to upper case
            		} // while
            		if (!found)
                		System.out.println (word + " was not found, so not upper-cased.\n\n");
            		System.out.println ("Here is the final version:\n" + aList);        
     		} // try
     		catch (IOException e)
     		{
			System.out.println (e);
     		} // catch
	} // method main

} // class LinkedMain