Bank.java.html

  1  import java.io.File;
  2  import java.io.IOException;
  3  import java.util.ArrayList;
  4  import java.util.Scanner;
  5  
  6  /**
  7     A bank contains customers.
  8  */
  9  public class Bank
 10  {  
 11     private ArrayList<Customer> customers;
 12  
 13     /**
 14        Constructs a bank with no customers.
 15     */
 16     public Bank()
 17     {  
 18        customers = new ArrayList<Customer>();
 19     }
 20     
 21     /**
 22        Reads the customer numbers and pins.
 23        @param filename the name of the customer file
 24     */
 25     public void readCustomers(String filename) 
 26           throws IOException
 27     {  
 28        Scanner in = new Scanner(new File(filename));
 29        while (in.hasNext())
 30        {  
 31           int number = in.nextInt();
 32           int pin = in.nextInt();
 33           Customer c = new Customer(number, pin);
 34           addCustomer(c);
 35        }
 36        in.close();
 37     }
 38     
 39     /**
 40        Adds a customer to the bank.
 41        @param c the customer to add
 42     */
 43     public void addCustomer(Customer c)
 44     {  
 45        customers.add(c);
 46     }
 47     
 48     /** 
 49        Finds a customer in the bank.
 50        @param aNumber a customer number
 51        @param aPin a personal identification number
 52        @return the matching customer, or null if no customer 
 53        matches
 54     */
 55     public Customer findCustomer(int aNumber, int aPin)
 56     {  
 57        for (Customer c : customers)
 58        {  
 59           if (c.match(aNumber, aPin))
 60           {
 61              return c;
 62           }
 63        }
 64        return null;
 65     }
 66  }
 67  
 68