Java - Count how many types of elements in an array.

package programs;

import java.util.HashMap;

public class CountNumberInArray {

public static void main(String[] args) {
int[] a = {11001101};

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

for(int i =0; i<a.length; i++){
char[] charr = String.valueOf(a[i]).toCharArray();
for(int j =0; j<charr.length; j++){
if(map.containsKey(charr[j])){
map.put(charr[j], map.get(charr[j])+1);
}
else{
map.put(charr[j], 1);
}
}
}
System.out.println(map);

}

}