IT 210 Week 8 Checkpoint #1: interfaces & communication messages

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IT 210 Week 8 Checkpoint #1: interfaces
& communication messages


Understanding object-oriented methodologies is often difficult. You already
understand that object-oriented analysis and design emulates the way human
beings tend to think and conceptualize problems.

As an example, consider a typical house in which there are several
bedrooms, a kitchen, and a laundry room, each with a distinct function. You
sleep in the bedroom, you wash clothes in the laundry room, and you cook in the
kitchen. Each room encapsulates all the items needed to complete necessary

You do not have an oven in the laundry room or a washing machine
in the kitchen. However, when you do the laundry, you do not just add clothes
to the washer and wait in the laundry room; once the machine has started, you
may go into the kitchen and start cooking dinner. How do you know when to go
back to check the laundry? When the washer buzzer sounds, a message is sent to
alert you to go back into the laundry room to put in a new load. While you are
folding clothes in the laundry room, the oven timer may ring to inform you that
your dinner is done cooking.

you have is a set of well-defined components: Each provides a single service to
communicate with the other components using simple messages when something
needs to be done. If you consider a kitchen, you see it is composed of several,
smaller components, including the oven, refrigerator, and microwave. Top-level
objects are composed of smaller components that do the actual work. This
perspective is a very natural way of looking at the world, and one with which
everyone is familiar. The same thing is done in object-oriented programming

- Identify components that perform a distinct service.

- Encapsulate all items in the component necessary to get the job done.

- Identify the messages that need to be provided to the other components.


Please consider the microwave oven in your kitchen, using the
object-oriented thinking described above.

Checkpoint has two parts:

Create a table with the following four column headings:

-  Top-Level Objects

     -  Communicates With

     -  Incoming Messages

     -  Outgoing Messages

the first column, identity the top-level objects of the microwave.  In the
next three columns, explain the graphical user interfaces and communication
messages that occur during the operation of a microwave.

Describe some of the advantages of having a componentized system. 
 For example, what happens if the microwave breaks?

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