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  1. import java.util.regex.Pattern;
  2.  
  3. public class Main {
  4.     public static void main(String[] args) {
  5.         String str = "aaBBdf8k3AAadnklA";
  6. 		System.out.println(
  7. 		   str
  8. 		   .toLowerCase()          // lowercase input String
  9. 		   .chars()                // get IntStream of all characters
  10. 		   .filter(c -> c == 'a')  // use filter to match only chosen characters
  11. 		   .count()
  12. 		);  
  13.     }
  14. }
Success #stdin #stdout 0.08s 56144KB
comments ()
stdin 
Standard input is empty
stdout 
6
https://ideone.com/7THge7
language:
Java (HotSpot 12)
created:
159 days ago
visibility:
secret

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