1. GC University, Lahore
Department of Computer Science
OOP Lab (Objects and Classes) 10-14/Oct/2011
Use BlueJ-Project Bank01 to work on these exercises. The solution will be dis-
cussed during Labs.
Task 1
Explain the following three programming paradigms: declarative; Imperative
(or procedural); and object-oriented.
Task 2
Describe in your own words the three main concepts of object-oriented pro-
gramming.
Task 3
Create an instance of class Bank with name "Allied Bank GCU" and bank code
1234. Choose "myBank" as an instance name. Examine the new created ob-
ject myBank from the object bench of BlueJ. Which methods are there? Which
methods can be executed successfully? And why some methods cannot be
executed?
Task 4
Create a new customer with name "Ali Khan". Give the instance name as my-
Customer. To examine the state of above create object call object inspector.
Which data fields are held by the object and what are their values? What value
will be returned when the method name( ) is called on myCustomer?
Task 5
Use instance myBank from Task 4 and instance myCustomer from Task 5.
Create a second instance of class Customer. Open an account for both cus-
tomers in the Allied Bank GCU. Now you should have now 5 objects in the
object list.
Deposit 200 in each account and then withdraw 100 from first account and
50 from second account. Which methods you have to call on myBank to print
out the actual status of both accounts. Is there any other method that can be
used to query the status of accounts?
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2. Task 6
What is the purpose of a constructer in a class and how it is different from a
method?
Task 7
Add a data field address of type String in class Customer. Make sure that this
data field is initialized in the constructor of class. The name and address of
customer will be provided as parameter while creating the instance of Cus-
tomer.
Insert a method getAddress in Customer class. The method returns the ad-
dress of customer.
Task 8
Create a class Address. Objects of this class will be used later to record (or
save) the addresses of customers. The class should be constructed as follow:
An address consists of data fields: street, houseno, area, and city.
All data fields will be initialized through constructor. The data fields
(instance variables) should be initialized with values that are passed as
arguments to constructor during the creation of an object of Address
class.
Write a method setStreet to change the street description.
Write a method getStreet that returns the street description.
Test your source code by compiling and creating an instance of Address
class. Verify with the help of object inspector whether all data fields have
been set correctly. Call methods setStreet and getStreet to verify their proper
functioning.
Task 9
Add a method printAddress in the definition of Address class. The method
should print the values of instance variables of an instance of Address class
in the following format:
HouseNo, Street,
Area City.
Have fun!
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