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    <p>There are many ways you can do this, let me explain to you a way that is both efficient and easy to understand .. and of course OO.</p> <p>[Step 1] You gotta have two maps one that stores file specific data and the other that stores filename and that files data. Instead of filename you can choose whatever you want.</p> <pre><code>private static HashMap&lt;String, MutableInt&gt; wordMap1 = new HashMap&lt;String, MutableInt&gt;(); private static HashMap&lt;String, MutableInt&gt; wordMap2 = new HashMap&lt;String, MutableInt&gt;(); private static HashMap&lt;String, HashMap&gt; fileMap = new HashMap&lt;String, HashMap&gt;(); </code></pre> <p>[Step 2] Make the MutableInt class (technically you wanna do this first) Now you might ask what is the MutableInt, its a class that you will create so that you can increment the value for a given word as you encounter it.</p> <p>Here is an example of the MutableInt class:</p> <pre><code>class MutableInt { int value = 1; public void increase () { ++value; } public int getValue () { return value; } public String toString(){ return Integer.toString(value); } } </code></pre> <p>[Step 3] Now for each word in the given file do the following:</p> <ol> <li>create a new wordMap for file you are parsing</li> <li>get the word from file</li> <li>check if word is in wordMap using wordmap.get("word");</li> <li>if output is null then you know its a new word.</li> <li>put the word in the map and put a MutableInt in its value using </li> <li>wordmap.put('word", new MutableInt());</li> <li>if output is not null then you know there it is not a new word so increase the counter using wordMap.getValue("word).increase();</li> <li>Once you are done doing this with all the words in the file you want to put the wordMap in the fileMap using fileMap.put("filename",wordMap);</li> </ol>
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    1. USMohamed Shakir
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