Italian La prossima settimana, VACANZE... ma per ora vado avanti

import java.io.*;
import java.util.*;
import javax.swing.JOptionPane;

class Base{
  
    short[]letters=new short[26];
  
    public Base(String word){
        for(int i=0;i<word.length();i++){
            letters[word.charAt(i)-97]++;
        }
    }
  
    public boolean equals(Object x){
        if(x!=null && x.getClass().equals(this.getClass())){
            Base a=(Base)x;
            for(int i=0;i<this.letters.length;i++)
                if(this.letters[i]!=a.letters[i])return false;
          
            return true;
        }
        return false;
    }
  
}

public class anagrams {
      
    public static void main(String[] args) throws IOException, FileNotFoundException{
        BufferedReader input = new BufferedReader(new FileReader("words.txt"));
        List <String> dict=new ArrayList<String>();
      
        String word=input.readLine();
        while(word!=null){
            dict.add(word);
            word=input.readLine();
        }
      
        String key=JOptionPane.showInputDialog("Inserisci la parola di cui cercare gli anagrammi: ");
      
        Base x=new Base(key);
        Iterator <String> i=dict.iterator();
        List <String> anag=new ArrayList<String>();
      
        while(i.hasNext()){
            String temp=i.next();
            if((new Base(temp)).equals(x))
                anag.add(temp);
        }
      
        System.out.println("Gli anagrammi della parola " + key + " presenti del dizionario sono:");
        Iterator <String> i2=anag.iterator();
      
        while(i2.hasNext()){
            System.out.println(i2.next());
        }
      
    }
}