Java Reference
In-Depth Information
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Chapter 12 Object-Oriented Design
C
HAPTER
G
OALS
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To learn about the software life cycle
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To learn how to discover new classes and methods
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To understand the use of CRC cards for class discovery
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To be able to identify inheritance, aggregation, and dependency relationships
between classes
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To master the use of UML class diagrams to describe class relationships
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To learn how to use object-oriented design to build complex programs
To implement a software system successfully, be it as simple as your next
homework project or as complex as the next air traffic monitoring system, some
amount of planning, design, and testing is required. In fact, for larger projects, the
amount of time spent on planning is much higher than the amount of time spent on
programming and testing.
If you find that most of your homework time is spent in front of the computer,
keying in code and fixing bugs, you are probably spending more time on your
homework than you should. You could cut down your total time by spending more
on the planning and design phase. This chapter tells you how to approach these tasks
in a systematic manner, using the object-oriented design methodology.
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12.1 The Software Life Cycle
In this section we will discuss the software life cycle: the activities that take place
between the time a software program is first conceived and the time it is finally
retired.
The life cycle of software encompasses all activities from initial analysis until
obsolescence.
