Uncommon characters Java

PROGRAM TO FIND UNCOMMON CHARACTERS OF THE TWO STRINGS

class GFG 

{

  

    // size of the hash table

    static int MAX_CHAR = 26;

  

    // function to find the uncommon 

    // characters of the two strings

    static void findAndPrintUncommonChars(String str1,

                                       String str2) 

    {

        // mark presence of each character as 0

        // in the hash table 'present[]'

        int present[] = new int[MAX_CHAR];

        for (int i = 0; i < MAX_CHAR; i++) 

        {

            present[i] = 0;

        }

  

        int l1 = str1.length();

        int l2 = str2.length();

  

        // for each character of str1, mark its

        // presence as 1 in 'present[]'

        for (int i = 0; i < l1; i++)

        {

            present[str1.charAt(i) - 'a'] = 1;

        }

  

        // for each character of str2

        for (int i = 0; i < l2; i++)

        {

              

            // if a character of str2 is also present

            // in str1, then mark its presence as -1

            if (present[str2.charAt(i) - 'a'] == 1

                || present[str2.charAt(i) - 'a'] == -1) 

            {

                present[str2.charAt(i) - 'a'] = -1;

            } 

              

            // else mark its presence as 2

            else

            {

                present[str2.charAt(i) - 'a'] = 2;

            }

        }

  

        // print all the uncommon characters

        for (int i = 0; i < MAX_CHAR; i++)

        {

            if (present[i] == 1 || present[i] == 2) 

            {

                System.out.print((char) (i + 'a') + " ");

            }

        }

    }

  

    // Driver code

    public static void main(String[] args) 

    {

        String str1 = "characters";

        String str2 = "alphabets";

        findAndPrintUncommonChars(str1, str2);

    }

}

OUTPUT

b c l p r

CREDITS: https://www.geeksforgeeks.org/find-uncommon-characters-two-strings/