import java.util.Map; import java.util.HashMap; class Main { public static void main(String[] args) { countChar("banana"); } public static void countChar(String s){ Map<Character, Integer> charMap = new HashMap<>(); for(char a : s.toCharArray()){ if(!charMap.containsKey(a)){ charMap.put(a,1); } else{ charMap.put(a, charMap.get(a) + 1); } } System.out.println(charMap.toString()); } }