Counting word frequency in a string

This recipe is quite different than the other recipes in this chapter as it deals with strings and counting word frequencies in a string. We will use both Apache Commons Math and Java 8 for this task. This recipe will use the external library while the next recipe will achieve the same with Java 8.

How to do it...

1. Create a method that takes a String array. The array contains all the words in a string:

           public void getFreqStats(String[] words){ 
   

2. Create a Frequency class object:

           Frequency freq = new Frequency(); 
   

3. Add all the words to the Frequency object:

           for( int i = 0; i < words.length; i++) { 
             freq.addValue(words[i].trim()); 
           } 
   

4. For each word, count the frequency using the Frequency class's getCount() method. Finally, after processing the frequencies, close the method:

        for( int i = 0; i < words.length; i++) { 
           System.out.println(words[i] + "=" + 
          ...