(SPOJ) 2280 - Encontre o telefone - Solução 2

Solução menos eficiente, pois usa o Map.

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

class Main {
    public static void main(String[] args) throws NumberFormatException, IOException {
        Main processando = new Main();
        processando.processa();
       
        System.exit(0);
    }
   
    void processa() throws NumberFormatException, IOException {
        Map<Character, Character> alfabeto = new TreeMap<Character, Character>();
       
        alfabeto.put('A', '2');
        alfabeto.put('B', '2');
        alfabeto.put('C', '2');
        alfabeto.put('D', '3');
        alfabeto.put('E', '3');
        alfabeto.put('F', '3');
        alfabeto.put('G', '4');
        alfabeto.put('H', '4');
        alfabeto.put('I', '4');
        alfabeto.put('J', '5');
        alfabeto.put('K', '5');
        alfabeto.put('L', '5');
        alfabeto.put('M', '6');
        alfabeto.put('N', '6');
        alfabeto.put('O', '6');
        alfabeto.put('P', '7');
        alfabeto.put('Q', '7');
        alfabeto.put('R', '7');
        alfabeto.put('S', '7');
        alfabeto.put('T', '8');
        alfabeto.put('U', '8');
        alfabeto.put('V', '8');
        alfabeto.put('X', '9');
        alfabeto.put('Z', '9');
        alfabeto.put('W', '9');
        alfabeto.put('Y', '9');
       
        String line = "";
       
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
             
        while((line = br.readLine()) != null) {
            for (int i = 0; i < line.length(); i++) {
                if (line.charAt(i) == '0' || line.charAt(i) == '1' || line.charAt(i) == '-') {
                    bw.write(line.charAt(i));
                }
                else {
                    bw.write(alfabeto.get(line.charAt(i)));
                }
            }

            bw.write("\n");
        }

       
        bw.flush();
        bw.close();                   
        return;
    }
}

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