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Exam 11: Classes Continued

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Question 1

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One way to enforce preconditions is to ____.

A) use comments
B) declare them
C) use inheritance
D) throw an exception

E) C) and D)
F) A) and B)

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Question 2

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A subclass often has methods that do not appear in its superclass.

A) True
B) False

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Question 3

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Classes that are related by inheritance have a has-a relationship. ____________________

It is easier to maintain a program that uses interface types.

An abstract class is one that will not be instantiated. ____________________

When information needs to be shared among all instances of a class, that information can be represented in terms of ____________________ variables.

Characteristics common to several classes can be collected in a common abstract subclass. ____________________

An interface is a class.

FIGURE 11-1 -Figure 11-1 above shows an example of a ____ hierarchy.

Identify the letter of the choice that best matches the phrase or definition. a.Dependency b.Extension c.Overriding d.Aggregation e.Inheritance -When an object of one class contains objects of another class as structural components.

____ provides a mechanism for reusing code and can reduce the effort required to implement a new class.

A class method is activated when a message is sent to the class rather than the object. ____________________

When you declare a variable, it should have a different interface name from the type name.

A class variable belongs to an object and is allocated storage when the object is created.

In general, a static variable is used in any situation in which all instances share a common data value.

Identify the letter of the choice that best matches the phrase or definition. a.Dependency b.Extension c.Overriding d.Aggregation e.Inheritance -When an object's class is a subclass of a more general class.

In Java, all classes are part of an immense hierarchy, with the class ____________________ at the root.

To compare objects for equality, use the ____.

The most general type of array is one whose element type is ____.

Identify the letter of the choice that best matches the phrase or definition. a.Dependency b.Extension c.Overriding d.Aggregation e.Inheritance -When the subclass method is intended as a replacement of the superclass method.