Check whether a string is a permutation of another string

IsPermutation.java

import java.util.Arrays;

public class IsPermutation {
  public static boolean isPermutation(String str1, String str2){

        if(str1.length() != str2.length()) return false;
          char[] c1 = str1.toCharArray();
          char[] c2 = str2.toCharArray();
          Arrays.sort(c1);
          Arrays.sort(c2);
        
        return Arrays.equals(c1,c2);
    }
    
    
    public static void main(String[] args) {
        System.out.println("reverse string");
        String word = "Hello world";
        String word2 = "Hello wordl";
        System.out.println(isPermutation(word,word2));
    }
}