// CSE 143, winter 2012
// This program counts the occurrences of words in a large file and lets the
// user ask how many times a given word occurred in the file.
// It demonstrates the use of a Map collection.

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

public class WordCount2 {
    public static void main(String[] args) throws FileNotFoundException {
    	// store a mapping from each word (key) to a count of the number of
        // occurrences of that word seen so far (value)
    	Map<String, Integer> words = new HashMap<String, Integer>();
    	
        System.out.println("Reading file...");
        Scanner input = new Scanner(new File("mobydick.txt"));
        while (input.hasNext()) {
            String word = input.next();
            if(words.containsKey(word)) {
            	words.put(word, words.get(word) + 1);
            } else {
            	words.put(word, 1);
            }
            
        }
        
        // prompt user for a word, and show the count of occurrences of it
        while (true) {
            Scanner console = new Scanner(System.in);
            System.out.print("Word to search for (blank to quit)? ");
            String word = console.nextLine();
            if (word.equals("")) {
                break;
            }
            
            // show occurrences of word using the map
            System.out.println(word + " occurs " + words.get(word) + " times.");
        }
    }
}