IT210 - Week 8 Object-Oriented Data and Processes

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Driving a vehicle

Open the door

Sit in the driver’s seat

Close the Door

Put on the seatbelt

Put key in ignition

Check area (mirrors)

Put the car in gear

Press down on the gas pedal

Think about this task in an object-oriented way, and identify the objects involved in the task.

Objects:

1. Car has the following objects (door, ignition, seat-belt, mirror, gear, gas pedal}

2. Key

Identify how you can encapsulate the data and processes you identified into an object-oriented

design.

With Car

Set Door.close = true

Set Seat-belt.on = true

Call Ignition

Call Mirror adjust

Call Gearngage

Call GasPedal

End With Car

The fundamental difference between an Object-Oriented design and a structured design is how

control is handled. In a structured approach, control is modeled separately from functions. A

good structured design has a single “smart” controller that performs only control functions and

many worker components that do the work. In an Object-Oriented design, control is partitioned

into each object (i.e., each component is designed to stand alone). This is a service-oriented

approach. To accomplish a given task, you have to go and get the services you need from

different service suppliers (i.e., objects).The structured approach is very efficient. Things get

done quickly and efficiently. While typically, the design is flexible enough to handle requirement

changes within a given system, the design is not well suited for reuse in a different domain. On

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Driving a vehicle Open the door Sit in the driver's seat Close the Door Put on the seatbelt Put key in ignition Check area (mirrors) Put the car in gear Press down on the gas pedal Think about this task in an object-oriented way, and identify the objects involved in the task. Objects: 1. Car has the following objects (door, ignition, seat-belt, mirror, gear, gas pedal} 2. Key Identify how you can encapsulate the data and processes you identified into an object-oriented design. With Car Set Door.close = true Set Seat-belt.on = true Call Ignition Call Mirror adjust Call Gearnga ...
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