Due date: Thursday, March 11, when labs close.

• memo.txt
• SelectionSort.java
• Sort.java
• Bank.java
• Optional: Eratosthenes.java

For more array practice, look at ArrayDemo2.java and ArrayDemo2.java with line numbers.

1. JOI Exercises 4-7 (Selection sort) Practice with nested for loops (but not two dimensional arrays.)

2. JOI Exercises 4-9 (Sort)

3. JOI Exercises 4-20 (Bank)

4. JOI Exercise 4-21 (BigBank). The input file bigbank.in and the corresponding correct output file bigbank.out referred to in the text can be downloaded from this page.

5. JOI Exercise 4-26 (box-and-arrow)

6. JOI Exercise 4-25 (Closing an account). (Just do this for the big bank you have written.)

   When you close an account in a big bank you need to decide what happens with the old account's number. If the report is

   	account   balance   transaction count
   	0	  $0		2
   	1	  $100		3
   	2	  $200		4
   	3	  $300		5
   

   and you close account 2 should you see

   	account   balance   transaction count
   	0	  $0		2
   	1	  $100		3
   	3	  $300		5
   

   or

   	account   balance   transaction count
   	0	  $0		2
   	1	  $100		3
   	2	  $300		5
   

   The first one would be better for a real bank. The owner of account 3 would be very surprised if her account number changed just because someone else closed an account.

   But the second one is easier to program using the ArrayList API, and we are just beginning programmers.

   You can do whichever you like for full credit on the homework - just make sure to discuss your choice in your memo.

   Closing an account should not count as a transaction, and the transaction count of the closed account should be subtracted from the Bank's transaction count (just as the balance is). (The answers might be different for a real bank, but we want to keep ours simple.)

   JOI says that the banker should be the one to close the account. But
   when I thought that through in response to Ricardo's question below I
   decided that it would be better if a customer closed his or her own
   account, after connecting to it in the usual way. So you should add a
   new customer transaction "close" to invoke the method
   
       public void close( BankAccount account )
   
   The customer should see the message
   
        "We will send you a check for [balance in account].
        "Thank you for banking with [name of Bank]. 
   
   Subject: closing an account
   Date: Tue, 9 Mar 2004 21:43:25 -0500 (EST)
   
    > From: a classmate
    > To: eb@cs.umb.edu
    > Subject: the method
    > Date: Tue, 09 Mar 2004 21:36:58 -0500
    > 
    > hello,
    > 
    > if a user closes the account, should the program automaticly
    > getting him out from the user account or after when the user types
    > "quit"?
   
   Good question. The only thing that makes sense is to say that close
   really means close and quit. If not, the user could try to see the
   balance in the account he just closed, or make a deposit there.
   
   
   
   
    
   Optional. 
   JOI Exercise 4-10 (The sieve of Eratosthenes) If you do this problem
   be sure to discuss it in your memo so we grade it.
   
   Put a main method in your Eratosthenes class. main should expect a
   single integer on the command line, so 
          > java Eratosthenes 10
   
   
   
   should produce exactly the output shown in the text as an example. In
   fact, you can use the code in the text in the body of main. Just
   replace the 10 there by the number from the command line. (Remember
   Integer.parseInt(), discussed in class.)