How to count Duplicate character in java using HashMap

In this blog we are going to learn how to count duplicate character in java using HashMap in java

Code :

package learningJava;

import java.util.*;

public class Learnig {

public static void main(String[] args) {

HashMap<Character,Integer> map = new HashMap<>();

String s = "##$$aabbcCdeaaF*  ,,,()+-****";

char[] charArray = s.toCharArray();

for(int i =0;i<charArray.length;i++) {

if(!map.containsKey(charArray[i])) {

map.put(charArray[i], 1);

}

else {

map.put(charArray[i], map.get(charArray[i])+1);

}

}

System.out.print(map);

}

}

Output

{ =2, a=4, b=2, #=2, c=1, C=1, $=2, d=1, e=1, F=1, (=1, )=1, *=5, +=1, ,=3, -=1 }