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Conta caracteres numa string

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mport java.util.Scanner;

public class CountCharacters {
public static void main(String [] args) {
  Scanner in = new Scanner(System.in);
  String s;
  char c;
  int counter = 0;

  System.out.print("Enter a string: ");
  s = in.nextLine();

  System.out.print("Enter a char: ");
  c  = in.nextLine().charAt(0);
  for(int i = 0; i < s.length(); i++) {
   if(s.charAt(i) == c) {

  System.out.println("Character " + c + " occur(s) in String " + s + " " + counter + " time(s)");


Este programar recebe uma string e pergunta qual o caracter que quero contar, a minha questao e que nao quero contar um caracter mas sim mais do que um. como e que mudo o codigo?

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