Char Matcher Count In 

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using CharMatcher.countIn() API. It returns the count of matching characters in the given char sequence.

File Name  :   com/bethecoder/tutorials/guava/base_tests/CharMatcherCountTest.java  Author  :   Sudhakar KV Email  :   [email protected]

package com.bethecoder.tutorials.guava.base_tests; import com.google.common.base.CharMatcher; public class CharMatcherCountTest {   /**    * @param args    */   public static void main(String[] args) {     System.out.println("Digit count : " + CharMatcher.DIGIT.countIn("ABC 1234"));     System.out.println("Char count : " + CharMatcher.JAVA_LETTER.countIn("ABC 1234"));     System.out.println("Char and digit count : " +          CharMatcher.JAVA_LETTER_OR_DIGIT.countIn("ABC 1234"));   } }

Digit count : 4
Char count : 3
Char and digit count : 7