Java: How to test if two Strings (words) are anagram using a Character Array?

Question:

How to test if two words are anagram using Arrays.sort()?

Code:

import java.util.Scanner;
 
public class Anagram {
 
  public static void main(String[] args) {
 
    Scanner sc = new Scanner(System.in);
    System.out.print("Enter first word: ");
    String word1 = sc.nextLine();
    System.out.print("Enter second word: ");
    String word2 = sc.nextLine();
 
    System.out.println("Anagram: " + isAnagram(word1,word2));
 
   }
 
 
  // Test if two words are Anagram using Character Array
  public static boolean isAnagram(String word1, String word2) {
 
    word1 = word1.toLowerCase();
    word2 = word2.toLowerCase();
 
    if (word1.length() != word2.length()) {
      return false;
    }
 
    char[] chars = word1.toCharArray();
    for (char c : chars) {
      int index = word2.indexOf(c);
      if (index != -1) {
        word2 = word2.substring(0, index) + word2.substring(index + 1, word2.length());
      } else {
        return false;
      }
    }
    return word2.isEmpty();
  }
}

Output:

$ java Anagram
Enter first word: Star
Enter second word: rats
Anagram: true

$ java Anagram
Enter first word: rate
Enter second word: tree
Anagram: false