Your company is continuing to work with ABC to implement the new system to proce

Question

Your company is continuing to work with ABC to implement the new system to process orders more quickly. Your current task is to create an object-oriented model of for the system. You will need to make assumptions about the functions of the business. List possible objects in the order entry system. Identify the attributes and the methods that could be included in each object. Create at least three instances of one of the objects you listed for the order entry system. Give an example of a superclass of one of the objects you listed for the order entry system. Identify possible actors and use cases in ABC’s functions. Create a use case description to document at least one of the use cases that you identify. Create an object relationship diagram that shows how the objects will interact in the system.

Explanation / Answer

Suppose that you want to assemble your own PC, you go to a hardware store and pick up a motherboard, a processor, some RAMs, a hard disk, a casing, a power supply, and put them together. You turn on the power, and the PC runs. You need not worry whether the motherboard is a 4-layer or 6-layer board, whether the hard disk has 4 or 6 plates; 3 inches or 5 inches in diameter, whether the RAM is made in Japan or Korea, and so on. You simply put the hardware componentstogether and expect the machine to run. Of course, you have to make sure that you have the correct interfaces, i.e., you pick an IDE hard disk rather than a SCSI hard disk, if your motherboard supports only IDE; you have to select RAMs with the correct speed rating, and so on. Nevertheless, it is not difficult to set up a machine from hardware components.

Similarly, a car is assembled from parts and components, such as chassis, doors, engine, wheels, brake, and transmission. The components are reusable, e.g., a wheel can be used in many cars (of the same specifications).

Hardware, such as computers and cars, are assembled from parts, which are reusable components.

How about software? Can you "assemble" a software application by picking a routine here, a routine there, and expect the program to run? The answer is obviously no! Unlike hardware, it is very difficult to "assemble" an application from software components. Since the advent of computer 60 years ago, we have written tons and tons of programs. However, for each new application, we have to re-invent the wheels and write the program from scratch.

Why re-invent the wheels?

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