Exam 11: Multiple Classes and Inheritance

Data access tier is another name for the presentation tier._________________________

When designing a program using the three-tier approach,a primary rule is that classes in the presentation tier can communicate only with classes in the ____ tier.

In a three-tier architecture,user interface classes should not be concerned with how the data is manipulated by the business classes.

CASE Critical Thinking Questions Case 11-1 Your colleague Jason is trying to clarify the three-tier program structure to you and he thinks that providing some practical examples will make it easier to explain it to you. -In the same fundraising database,which tier does Jason tell you contains the code that allows you to save donations to permanent storage,or to open a record for a donor listing all of her gifts to the institution?

In a three-tier architecture,only the persistence classes will actually ____ data.

The ____ property should be tested to ensure that a masked textbox contains characters for the entire mask area.

A subclass is always in a "has-a" relationship with the base class._________________________

The ____ prepares an object for use in the program.

MATCHING Identify the letter of the choice that best matches the phrase or definition. -Variables declared in a base class are available for use in a subclass through this

The presentation tier of the three-tier structure consists of one or more forms and the objects placed on the forms.

When a subclass is instantiated,only the subclass's constructor is executed.

Variables in a base class that are declared with ____________________ access can be referenced only by subclasses but not by outside classes.

A(n)____________________ object can be used to write a stream of text to a file.

MATCHING Identify the letter of the choice that best matches the phrase or definition. -A benefit of using these is that the variables defined in one can be hidden from processing in others

The persistence tier,sometimes called the _________________ tier,contains the classes required to read and write data from permanent storage.

If the developer writes no code for a class ____,Visual Basic automatically generates any processing that must be accomplished to prepare the object for use.

When a class is instantiated into an object,a special procedure in the instantiated class called a(n)____________________ is executed.

____ is the concept of separating processing and hiding data within specific classes.

To determine if a selection was made in a combo box,the value of the ____________________ property should be tested.

When an object requires data when it is instantiated,the data can be passed as part of the ____ code.