Object-Oriented Programming in Action
Let's re-examine the shapes example discussed at the beginning of the chapter. How would I implement it in an object-oriented manner? Remember that it has to do the following:
1. |
Locate the list of shapes in the database.
|
2. |
Open up the list of shapes.
|
3. |
Sort the list according to some rules.
|
4. |
Display the individual shapes on the monitor.
|
To solve this in an object-oriented manner, I need to define the objects and the responsibilities they would have.
The objects I would need are:
| Class | Responsibilities (Methods) |
|---|---|
| ShapeDataBase | getCollection —get a specified collection of shapes |
| Shape (an abstract class) | display —defines interface for Shapes getX —return X location of Shape (used for sorting) getY ... |
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