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Exam 6: A First Look at Classes

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Question 31

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What is stored by a reference variable?

A) A binary encoded decimal
B) A memory address
C) An object
D) A string

E) A) and B)
F) All of the above

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Question 32

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The term "default constructor" is applied to the first constructor written by the author of a class.

A) True
B) False

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Question 33

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In the cookie cutter metaphor, think of the ________ as a cookie cutter and ________ as the cookies.

Instance methods should be declared static.

It is common practice in object-oriented programming to make all of a class's:

Given the following code, what will be the value of finalAmount when it is displayed? Public class Order { Private int orderNum; Private double orderAmount; Private double orderDiscount; Public Order(int orderNumber, double orderAmt, Double orderDisc) { OrderNum = orderNumber; OrderAmount = orderAmt; OrderDiscount = orderDisc; } Public double finalOrderTotal() { Return orderAmount - orderAmount * OrderDiscount; } } Public class CustomerOrder { Public static void main(String[] args) { Order order; Int orderNumber = 1234; Double orderAmt = 580.00; Double orderDisc = .1; Order = new Order(orderNumber, orderAmt, orderDisc) ; Double finalAmount = order.finalOrderTotal() ; System.out.printf("Final order amount = $%,.2f\n", FinalAmount) ; } }

Most programming languages that are in use today are:

When you are working with a ________, you are using a storage location that holds a piece of data.

A constructor:

An access specifier indicates how the class may be accessed.

When an object is passed as an argument to a method, what is passed into the method's parameter variable?

A method that gets a value from a class's field but does not change it is known as a mutator method.

When an object is created, the attributes associated with the object are called:

A method that stores a value in a class's field or in some other way changes the value of a field is known as a mutator method.

Data hiding, which means that critical data stored inside the object is protected from code outside the object, is accomplished in Java by:

The public access specifier for a field indicates that the attribute may not be accessed by statements outside the class.

In UML diagrams, this symbol indicates that a member is public.

The following package is automatically imported into all Java programs.