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

public class WordFreq {
	private ArrayList<String> words;
	private ArrayList<Integer> counts;

	public WordFreq() {
		this.words = new ArrayList<String>();
		this.counts = new ArrayList<Integer>();
	}

	public WordFreq(String fileName) throws java.io.FileNotFoundException {
	    this.words = new ArrayList<String>();
		this.counts = new ArrayList<Integer>();
		
	    Scanner infile = new Scanner(new File(fileName));
	    while (infile.hasNext()) {
	        String nextWord = infile.next();
	        this.addWord(nextWord);
	    }
	}
	   
	public void addWord(String newWord) {
		int index = words.indexOf(newWord);
		if (index == -1) {
		    this.words.add(newWord);
		    this.counts.add(1);
		}
		else {
		    this.counts.set(index, this.counts.get(index)+1);
		}
	}
	 
	public int wordCount(String desiredWord) {
	    int index = this.words.indexOf(desiredWord);
	    if (index == -1) {
	        return 0;
	    }
	    else {
	        return this.counts.get(index);
	    }
	}
	
	public int numWords() {
	    return this.words.size();
	}
	
	public void showAll() {
	    for (int i = 0; i < this.words.size(); i++) {
	        System.out.println(this.words.get(i) + ": " +
	                           this.counts.get(i));
	    }
	}
}