Java示例计数单词组

import java.util.regex.Matcher;

import java.util.regex.Pattern;



public class MatcherGroupCountExample {

   public static void main(String args[]) {

      Pattern p = Pattern.compile("J(ava)");

      String candidateString = "This is Java. This is a Java example.";

      Matcher matcher = p.matcher(candidateString);

      int numberOfGroups = matcher.groupCount();

      System.out.println("numberOfGroups =" + numberOfGroups);

   }

}