Home Java Beginners Word Count

Word Count
Posted on: July 6, 2007 at 12:00 AM

Here providing you an example that counts the number of occurrences of a specific word in a string.

Word Count

This example counts the number of occurrences of a specific word in a string. Here we are counting the occurrences of word "you" in a string. To count it we are using countMatches() method.

The org.apache.commons.lang.StringUtils class extends the Object class and defines certain words related to String handling such as null for null,"" for a zero-length string, ' ' for space characters, Charecter.isWhitespace(char) for whitespace and String.trim() for trim. The StringUtils class handles null input strings.

The method used:

countMatches(String str,String sub): This method counts how many times the string sub appears in the String str. This method returns zero if StringUtils.countMatches(null, *), StringUtils.countMatches("", *) ,StringUtils.countMatches("abba", null),StringUtils.countMatches("abba", "") , and StringUtils.countMatches("abba", "x"). The parameters used as "str" is String to be checked and "sub" is substring to be count.

The code of the program is given below:


import org.apache.commons.lang.StringUtils;

 

public class WordCountExample 

{  

  public static void main(String[] args)

  {

  String string = "How r you?R you fine?Where are you going?";  

  System.out.println(StringUtils.countMatches(string,"you")

    + " occurrences of the word 'you' in '" + string +

  "' is found.");

  }

}

The output of the program is given below:

C:\rajesh\kodejava>javac WordCountExample.java

C:\rajesh\kodejava>java WordCountExample
3 occurrences of the word 'you' in 'How r you?R you fine?
Where are you going?' is found.

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