Find Repeated Characters, Find unique Characters using Hashmap

package packageName;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Map;

 

public class countDuplicates_FinduniqueUsingHashmap {

 

       public static void main(String[] args) {

            

             String str = "asdfSdfogdFzgjknEswsAawm";

             int l = str.length();

             String s = "";

             Map<String,Integer> map = new HashMap<String,Integer>();

             ArrayList<String> uniqueChars = new ArrayList<String>();

             for(int i=0; i<l;i++) {

                    s = Character.toString(str.charAt(i));

                    if(map.containsKey(s)) {

                           map.put(s, map.get(s)+1);

                    } else {

                           map.put(s, 1);

                           uniqueChars.add(s);// not correct way to get unique chars

                    }

             }

             System.out.println(map); //Output:  {a=2, A=1, d=3, E=1, f=2, F=1, g=2, j=1, k=1, m=1, n=1, o=1, s=3, S=1, w=2, z=1} correct

             String smallchar = str.replaceAll("[^a-z]","");

             System.out.println("small chars are "+smallchar); //Output:  asdfdfogdzgjknswsawm

             int hashMapSize = map.size(); //Output:  13 correct

             System.out.println("Hashmap Size is "+hashMapSize); //Output:  13 correct

 

//Find UNIQUE CHARS

             for(Map.Entry<String,Integer> entry : map.entrySet()) {

                    if(entry.getValue().equals(1)) {

                           System.out.println("the key having the value 1 : "+entry.getKey()); 

                    }

             }

             System.out.println("Unique chars "+uniqueChars); //Output:  [a, s, d, f, o, g, z, j, k, n, e, w, m] not correct

       }

 

}

 

/* Output

the key having the value 1 : A

the key having the value 1 : E

the key having the value 1 : F

the key having the value 1 : j

the key having the value 1 : k

the key having the value 1 : m

the key having the value 1 : n

the key having the value 1 : o

the key having the value 1 : S

the key having the value 1 : z   */