import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class WordCount implements WordCountInterface
{
    private boolean useScanner;
    
    public static void main(String[] args) {
	WordCount wc = new WordCount();
	wc.words("WordCount.java", 10, 10);
    }

    public void setUseScanner(boolean uS)
    {
	this.useScanner = uS;
    }

    public void words(String fileName)
    {
	words(fileName, 0, -1);
    }

    public void words(String fileName, int startingWord)
    {
	words(fileName, startingWord, -1);
    }

    public void words(String fileName, int startingWord, int numWords)
    {
	int wordCount=0;
	try (Scanner input=new Scanner(new File(fileName))){            
	    while (input.hasNextLine()) { // test if there is a line to read
		if (useScanner)
		{
		    Scanner s2 = new Scanner(input.nextLine()); 
		    while (s2.hasNext()) {
			String s = s2.next();
			if (wordCount>=startingWord && (wordCount<(startingWord+numWords) || numWords<0))
			    System.out.println(String.format("%4d %s", wordCount, s));
			wordCount++;
		    }
		    s2.close();
		}
		else
		{
		    String line = input.nextLine();
		    String[] ss = line.split(" ");
		    for (String s : ss)
		    {
			if (wordCount>=startingWord && (wordCount<(startingWord+numWords) || numWords<0))
			    System.out.println(String.format("%4d %s", wordCount, s));
			wordCount++;
		    }
		}
	    }
	}
	catch (FileNotFoundException e) {
		System.err.println("Error in opening the file:" + fileName);
		System.exit(1);
	}
    }
}