Konversi Nilai Huruf ke Angka ( if )

import java.io.*;
public class Angka {
 public static void main(String[] args) throws IOException {
    BufferedReader x=new BufferedReader(new InputStreamReader(System.in));
   
    String nh = "";
    System.out.print("Nilai huruf = ");
    nh = x.readLine();    
    int na=0;
    if (nh.equals("A"))
      na=4;
    else if (nh.equals("B"))
      na=3;
    else if (nh.equals("C"))
      na=2;
    else if (nh.equals("D"))
      na=1;
    else if (nh.equals("E"))
      na=0;
    System.out.println("Nilai angka = "+na);   
 }
}