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

// Determines word counts in a file.
public class WordCount2 {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner console = new Scanner(System.in);
        System.out.print("What is the name of the text file? ");
        String fileName = console.nextLine();
        Scanner input = new Scanner(new File(fileName));

		long start = System.currentTimeMillis();

        Map<String, Integer> counts = new HashMap<String, Integer>();
        while (input.hasNext()) {
            String word = input.next().toLowerCase();
            if (counts.containsKey(word)) {
                counts.put(word, counts.get(word) + 1);
            } else {
                counts.put(word, 1);
            }
        }
        
        long end = System.currentTimeMillis();
		long elapsed = end - start;

        // Print out words with over 1000 occurrences
        for (String word : counts.keySet()) {
            int count = counts.get(word);
            if (count > 1000) {
                System.out.println(count + "\t" + word);
            }
        }
        

		System.out.println("The file has " + counts.size() + " words.");
		System.out.println("Took " + elapsed + " ms.");
    }
}