Codificacion de un Arbol mediante Listas

import java.io.*;

public class Leer{

                public static String dato(){

                               String sdato = "";

                               try{

                                               InputStreamReader isr =

                                                               new InputStreamReader(System.in);

                                               BufferedReader flujoE=

                                                               new BufferedReader(isr);

                                               sdato = flujoE.readLine();

                               }

                               catch(IOException e){

                                               System.err.println("Error: " + e.getMessage());

                               }

                               return sdato;

                }

 

                public static short datoShort(){

                               try{

                                               return Short.parseShort(dato());

                               }

                               catch(NumberFormatException e){

                                              

                                               return Short.MIN_VALUE;

                               }

                }

 

                public static int datoInt(){

                               try{

                                               return Integer.parseInt(dato());

                               }

                               catch(NumberFormatException e){

                                               return Integer.MIN_VALUE;

                               }

                }

 

                public static long datoLong(){

                               try{

                                               return Long.parseLong(dato());

                               }

                               catch(NumberFormatException e){

                                               return Long.MIN_VALUE;

                               }

                }

 

                public static float datoFloat(){

                               try{

                                               Float f = new Float(dato());

                                               return f.floatValue();

                               }

                               catch(NumberFormatException e){

                                               return Float.NaN;

                }

                }

 

                public static double datoDouble(){

                               try{

                                               Double d = new Double(dato());

                                               return d.doubleValue();

                               }

                               catch(NumberFormatException e){

                                               return Double.NaN;

                               }

                }

 

                public static String datoString(){

                               return dato();

                }

               

                public static char datoChar(){

                               int c=0;

                               try{

                                               InputStreamReader isr =

                                                               new InputStreamReader(System.in);

                                               BufferedReader flujoE=

                                                               new BufferedReader(isr);

                                               c=flujoE.read();

                                               char car;

                                               car=(char) c;

                                               return car;

                               }

                               catch(IOException e){

                                               return '\0';

                               }

                }

}