just another null pointer exception while working with array of objects

[Vicky Chand]

I am getting a null-pointer exception though i can't understand why can you guys help

this is my main method

 public static void main(String [] args){
     Bank[] b = new Bank[5] ;
     
 
   for(int i=0; i<b.length;i++){
    b[i] = new Bank();
   }
 
     b[0].addCustomer("Jane","Simms" );// nullpointer exception here 
     b[1].addCustomer("Jaya","jj");
     b[2].addCustomer("a","a");
     b[3].addCustomer("b","b");
     b[4].addCustomer("c","c");
     for(int i=0; i<b.length;i++){
     System.out.println("Customer :"+b[i].getCustomer(i) );
     }
 
the 
 

public class Bank {
   private Customer[] customers;
 
   private int numberOfCustomers;
 
    public void bank(){
        customers = new Customer[5];
        System.out.println("Customer Initialized");
        numberOfCustomers = 0;
 
    }
 
    public void addCustomer(String f, String l){
        int i = numberOfCustomers++ ;
        String g = f;
        String k = l;
        customers[i] = new Customer(g, k);//first i get a nullpointer excp here
}
}

[Sunil Kumar]

What's the implementation of the constructor for Bank??
[ December 16, 2008: Message edited by: Sunil Kumar ]

[Ernest Friedman-Hill]

You're clearly intending this as the constructor of the Bank class:

public void bank(){

but it's not, for two reasons. First, the name should be Bank, not bank; letter case matters. Second, constructors have no return types; if you write a method with the same name as the class, but use "void" as the return type, then it's a method, not a constructor.

As a result of these issues, the code in this 'constructor' is actually never called.

So this one line should be

public Bank(){

[Sunil Kumar]

Agreed. Further adding a customer will throw ArrayIndexOutOfBoundsException

[Vicky Chand]

Yeah!! right
I am still new to the programming world so still making silly mistakes.

[Vicky Chand]

one thing everyone missed out was that the bank array declaration was to be shifted in the second for loop
Thank you all