Write a WordCount class to Open a text file containing a variable number of word

Question

Write a WordCount class to

Open a text file containing a variable number of words.

Please note:

Hash table operations should be done through method calls to the HashTable class.

Create an instance of your Hashtable class.

Read in words from the text file until the end of the file is reached

Look up the word in your hash table.

If word is found

Increment its count in the hash table

otherwise

Add the word to the hash table and set its count to 1.

Print out the words and their counts

Please note:

Hash table operations should be done through method calls to the HashTable class.

Explanation / Answer

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;

public class WordCount {
   static final Integer Integer(1);

   /**
   * @param args
   * @throws IOException
   */
   public static void main(String args[]) throws IOException {
       Hashtable<String, Integer> map = new Hashtable<String, Integer>();
       FileReader fr = new FileReader("test.txt");
       BufferedReader br = new BufferedReader(fr);
       String line;
       while ((line = br.readLine()) != null) {
           processLine(line, map);
       }
       br.close();
       Enumeration<String> e = map.keys();
       while (e.hasMoreElements()) {
           String key = (String) e.nextElement();
           System.out.println(key + " : " + map.get(key));
       }

   }

   /**
   * method to process the line
   *
   * @param line
   * @param map
   */
   private static void processLine(String line, Hashtable<String, Integer> map) {
       StringTokenizer st = new StringTokenizer(line);
       while (st.hasMoreTokens()) {
           addWord(map, st.nextToken());
       }
   }

   /**
   * method to add and count the words in the map
   *
   * @param map
   * @param word
   */
   private static void addWord(Hashtable<String, Integer> map, String word) {
       Object obj = map.get(word);
       if (obj == null) {
           map.put(word, ONE);
       } else {
           int i = ((Integer) obj).intValue() + 1;
           map.put(word, new Integer(i));
       }
   }
}
test.txt
The worsst drought in the United States in neearly a century is expected to drive up the price of milk, beef and pork next yeer, the government said Wednesdaay, as consumers bear some of the bruntt of the sweltering heat that is drivng up the cost of feed corrn.
OUTPUT:
cost : 1
Wednesdaay, : 1
next : 1
consumers : 1
heat : 1
as : 1
feed : 1
The : 1
States : 1
milk, : 1
United : 1
beef : 1
is : 2
the : 6
expected : 1
in : 2
bruntt : 1
price : 1
drought : 1
sweltering : 1
up : 2
said : 1
bear : 1
drive : 1
of : 4
that : 1
some : 1
worsst : 1
pork : 1
and : 1
government : 1
neearly : 1
drivng : 1
century : 1
corrn. : 1
a : 1
to : 1
yeer, : 1

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