Problem with array [JAVA]

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0<br />
	at generale.Vettori.Caricamento(Vettori.java:39)<br />
	at generale.Generale.main(Generale.java:43)<br />
C:\Users\Peppe7\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1<br />
BUILD FAILED (total time: 4 seconds)

package generale;
import java.io.*;

/**
 *
 * @author DE_VITA1700
 */
  public class Vettori {
        //*******************************************
        //Input
        InputStreamReader input = new InputStreamReader(System.in);
        BufferedReader tastiera = new BufferedReader(input);
        //******************************************* 
     private int N;
     
     public void setN(int x){
        N=x;
     }
     private int V[] = new int[N];
     public void Caricamento() {
         int dato=0;
         String numero;
       
         for(int i=0;i<N;i++) {
            try {
             System.out.print("Valore da inserire alla posizione n°" + i + ": ");
             numero = tastiera.readLine();
             dato = Integer.valueOf(numero).intValue();
            }
            catch(Exception e){
            System.out.println("Inserisci un numero!");
            }
            V[i]=dato;
         }
     }
         public void Stampa(){
         for(int i=0;i<V.length;i++){
             System.out.println(V[i]);
         }
     }
  
  
  
  }