I did like this Found it more simly to transform it into a char array sort it and compare:

import java.io.; import java.util.;

public class Solution {

public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    String a = in.nextLine().toLowerCase();
    String b = in.nextLine().toLowerCase();
    in.close();

    char[] arrayA = a.toCharArray();
    char[] arrayB = b.toCharArray();

    Arrays.sort(arrayA); 
    Arrays.sort(arrayB); 

    if(Arrays.equals(arrayA, arrayB)){
        System.out.println("Anagrams");
    } else {System.out.println("Not Anagrams");}



}

}