Count the number of occurrences of a character in a String?

package javaprgms;

public class StringCount {

public static void main(String[] args)

{

String str = "abcdcabcdacbdadbca";

     String findStr = "a";

     int lastIndex = 0;

     int count = 0;

     while (lastIndex != -1) {

      lastIndex = str.indexOf(findStr, lastIndex);

      if (lastIndex != -1) {

       count++;

       lastIndex += findStr.length();

      }

     }

     System.out.println(count);

}

}

Output:

5