PS7Q3

import java.io.File;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Q3 {

    private static Scanner kb;
    private static Scanner fs;

    private static HashMap<String, Integer> mappings;

    public static File openFile(String input)
    {
        System.out.println("Opening " + input);
        File f = new File(input);
        return f;
    }

    public static void countUnique(File input, HashMap<String, Integer> map)
    {
        try
        {
            fs = new Scanner(input);
            while(fs.hasNext())
            {
                String temp = fs.next();
                // If this map already contains the word
                if(map.containsKey(temp))
                    {
                        // Increment the integer value associated with the key
                        // and add it back in their (an already existing key
                        // is over ridden with the new value of the key
                        int newValue = map.get(temp) + 1;
                        map.put(temp, newValue);
                    }
                else
                {
                    map.put(temp, 1);
                }

            }

        } catch (FileNotFoundException e) {
            System.out.println("Error - file not found");
            e.printStackTrace();
        }
    }

    public static String mostUsedWord(HashMap<String, Integer> map)
    {
        String mostUsed = null;
        int maxValue = 0;
        for(String key: map.keySet())
        {
            if(key.length() > 5 && map.get(key) >= maxValue)
            {
                mostUsed = key;
                maxValue = map.get(key);
            }
        }
        return mostUsed;
    }

    public static void main(String[] args)
    {
        kb = new Scanner(System.in);

        System.out.println("Enter a file name");
        File inputFile = openFile(kb.next());

        mappings = new HashMap<String, Integer>();
        countUnique(inputFile, mappings);

        System.out.println("Most common word");
        System.out.println(mostUsedWord(mappings) + " -> " +
                mappings.get(mostUsedWord(mappings)));

    }

}