Create an array of object

Hi I am MCM Student

I want to create an array of object which will accepts the more than one record I tried following code but its giving nullpointer Exception. Please tell me how should i solve this problem

import java.io.*;


class Account
{
private String name;
private int ano;
private int atype;
private double abal;

public void getdata(String n, int no, int type, double bal)
{
name = n;
ano = no;
atype = type;
abal = bal;
}

public void display()
{


System.out.println("Account No: " + ano);
System.out.println("Customer Name: " + name);
if (atype == 1)
{
System.out.println("Account type: Saving A/C");
System.out.println("Facilty: Withdrawal");
}
else
{
System.out.println("Account type : Current A/C");
System.out.println("Facility : Cheque Book");
}

System.out.println("Account balance : " + abal);
}

}

class Acc_demo
{
private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

public static void main(String arg[]) throws IOException
{
Account a[] = new Account[2];

System.out.println("Enter records: ");

for (int i = 0; i < 2; i++)
{
System.out.println("Enter Customer Name: ");
String nm = br.readLine();

System.out.println("Enter A/C No: ");
int no = Integer.parseInt(br.readLine());

System.out.println("Enter Account type:");
System.out.println("1 - Saving Account");
System.out.println("2- current Account");
int at = Integer.parseInt(br.readLine());

System.out.println("Enter your last balance: ");
int bal = Integer.parseInt(br.readLine());

a[i].getdata(nm,no,at,bal);
a[i].display();
}
}