When Identifying the Proper Instance Variables to Use in the Design

question 93

Multiple Choice

When identifying the proper instance variables to use in the design of an inheritance hierarchy, how do you decide where in the hierarchy a variable should be placed?

• A)Instance variables should only be declared in the superclass and then accessed using the super keyword.
• B)Instance variables should only be declared in subclasses.
• C)Instance variables that are common to all classes should be placed at the base of the hierarchy.
• D)Instance variables that are relevant to only one class should be placed at the base of the hierarchy.

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Definitions:

Cytoskeleton

A complex network of interlinking filaments and tubules that extend throughout the cytoplasm in cells, providing structure and facilitating movement.

Structural Components

The physical parts or elements that make up an object, system, or organism, providing it with stability and form.

Microfilaments

Small, rod-like structures present in the cytoplasm of all eukaryotic cells, composed mainly of the protein actin, and involved in various forms of cell movement and in the maintenance of the cell's shape.

Rodlike Structures

Any elongated, cylindrical shapes or components found in biological organisms or cells, often referring to the physical structure of certain proteins or cellular organelles.