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.");
}
}
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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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