how to find the frequency of characters in given string in java

Code: import java.util.*; import java.lang.*; class Demo{ public static void essential(String[] args){ String title = “fool”; Map<Character,Integer> map = new HashMap<Character,Integer>(); for(int i=0;i<title.size();i++){ Character ch = title.charAt(i); map.put(ch,map.getOrDefault(ch,0)+1); } System.out.println(map); for(Map.Entry<Character,Integer> e : map.entrySet()){ System.out.println(e.getKey()+” “+e.getValue()); } } } Enter fullscreen mode Exit fullscreen mode o/p: