Object-Oriented Software Design Chapter 7 Java Software Solutions Global Edition Lewisloftus Objectoriented Design Multiplechoice Questions During

Java Software Solutions, 8e, Global Edition (Lewis/Loftus)

Chapter 7 Object-Oriented Design

7.1 Multiple-Choice Questions

1) During program development, software requirements specify

A) how the program will accomplish the task

B) what the task is that the program must perform

C) how to divide the task into subtasks

D) how to test the program when it is done

E) all of the above

2) Once we have implemented the solution, we are not done with the problem because

A) the solution may not be the best (most efficient)

B) the solution may have errors and need testing and fixing before we are done

C) the solution may, at a later date, need revising to handle new specifications

D) the solution may, at a later date, need revising because of new programming language

features

E) all of the above

3) Of the various phases in software development, which of the following is usually the

lengthiest?

A) specification

B) design

C) implementation

D) testing

E) maintenance

4) A bad programming habit is to build an initial program and then spend a great deal of time

modifying the code until it is acceptable. This is known as

A) the prototyping approach

B) the waterfall model

C) iterative development

D) the recursive approach

E) the build-and-fix approach

5) The activities of the development cycle are generally thought to

A) be strictly linear

B) be rigidly ordered

C) overlap

D) have optional steps

E) both A and B are true

6) The idea of having programmers and developers meet in order to critique a software design or

implementation is known as

A) an interview

B) a walkthrough

C) prototyping

D) aggregation

E) evolutionary development

7) Modifying a program in order to eliminate deficiencies is done in the ________ phase of the

development cycle.

A) design

B) implementation

C) testing

D) use

E) maintenance

8) It is easier to correct errors found in a program if

A) they are identified early in the development cycle

B) they are identified during testing

C) they are identified during program use

D) they are identified during maintenance

E) all of the above are equally true, errors are easily corrected in any of these stages

9) In general, spending more time in development to ensure better software will

A) shorten testing time

B) slightly reduce maintenance efforts

C) slightly increase maintenance efforts

D) greatly reduce maintenance efforts

E) not alter the time it takes for any other stage whatsoever

10) The idea that an object can exist separate from the executing program that creates it is called

A) transience

B) static

C) persistence

D) serialization

E) finality

11) In order to create a constant, you would use which of the following Java reserved words?

A) private

B) static

C) int

D) final

E) class

12) Which of the following methods is a static method? The class in which the method is

defined is given in parentheses following the method name.

A) equals (String)

B) toUpperCase (String)

C) sqrt (Math)

D) format (DecimalFormat)

E) paint (Applet)

13) Static methods cannot

A) reference instance data

B) reference non-static instance data

C) reference other objects

D) invoke other static methods

E) invoke non-static methods

14) An object that refers to part of itself within its own methods can use which of the following

reserved words to denote this relationship?

A) inner

B) i

C) private

D) this

E) static

15) An example of an aggregation relationship is

A) parent and child

B) animal and dog

C) teacher and computer

D) phone and fax machine

E) all of the above

16) Inheritance through an extended (derived) class supports which of the following concepts?

A) interfaces

B) modulary

C) information hiding

D) code reuse

E) correctness

17) Java does not support multiple inheritance, but some of the abilities of multiple inheritance

are available by

A) importing classes

B) implementing interfaces

C) overriding parent class methods

D) creating aliases

E) using public rather than protected or private modifiers

18) Abstract methods are used when defining

A) interface classes

B) derived classes

C) classes that have no constructor

D) arrays

E) classes that have no methods

19) Which of the following is not a method of the Object class?

A) clone

B) compareTo

C) equals

D) toString

E) all of the above are methods of the Object class

20) Which of the following interfaces would be used to implement a class that represents a group

(or collection) of objects?

A) Iterator

B) Speaker

C) Comparable

D) MouseListener

E) KeyListener

21) In order to implement Comparable in a class, what method(s) must be defined in that class?

A) equals

B) compares

C) both lessThan and greaterThan

D) compareTo

E) both compares and equals

22) Which of the following method headers would properly define the method needed to make

this class Comparable?

A) public boolean comparable(Object cp)

B) public int comparable(Object cp)

C) public int compareTo(Object cp)

D) public int compareTo( )

E) public boolean compareTo(Object cp)

23) Which of the following pieces of logic could be used in the method that implements

Comparable? Assume that the method is passed Object a, which is really a ChessPiece. Also

assume that ChessPiece has a method called returnType which returns the type of the given

piece. Only one of these answers has correct logic.

A) if (this.type < a.returnType( )) return -1;

B) if (this.type = = a.returnType( )) return 0;

C) if (this.type.equals(a.returnType( )) return 0;

D) if (a.returnType( ).equals(“King”)) return -1;

E) if (a.returnType( ).equals(“Pawn”)) return 1;

24) Which of the following would not be considered an algorithm?

A) a recipe

B) a computer program

C) pseudocode

D) a shopping list

E) travel directions

25) It is important to dissect a problem into manageable pieces before trying to solve the problem

because

A) most problems are too complex to be solved as a single, large activity

B) most problems are solved by multiple people and it is easy to assign each piece to a separate

person

C) it is easier to integrate small pieces of a program into one program than it is to integrate one

big chunk of code into one program

D) our first solution may not solve the problem correctly

E) all of the above

26) Having multiple class methods of the same name where each method has a different number

of or type of parameters is known as

A) encapsulation

B) information hiding

C) tokenizing

D) importing

E) method overloading

27) The goal of testing is to

A) ensure that the software has no errors

B) find syntax errors

C) find logical and run-time errors

D) evaluate how well the software meets the original requirements

E) give out-of-work programmers something to do

10

28) Arranging components in a GUI container is accomplished by using which of the following?

A) Layout manager

B) Listener interface

C) String array

D) Event generator

E) JComboBox

29) Which Layout Manager type would you use if you want GUI components to be placed at the

North, South, East, West and Center of the container?

A) FlowLayout

B) BorderLayout

C) BoxLayout

D) GridLayout

E) TabbedPane

30) Which Layout Manager type would you use if you want GUI components to be placed in 2

columns over 5 rows?

A) FlowLayout

B) BorderLayout

C) BoxLayout

D) GridLayout

E) TabbedPane

31) Which Layout Manager is used by default if you do not specify a Layout Manager for your

GUI container?

A) FlowLayout

B) BorderLayout

C) BoxLayout

D) GridLayout

E) TabbedPane

32) Which of the following GUI classes requires that it have a LayoutManager before any GUI

components are added to it?

A) JButton

B) JSlider

C) JPanel

D) JFrame

E) both C and D but not A or B

33) In using the BoxLayout, adding space between components in a container can be

accomplished by

A) including TabbedPanes

B) including JButtons that have no names and thus will appear invisible

C) adding invisible components

D) inserting IconImages of blank images

E) any of the above

34) In order to display three components vertically in a container, you could use all but which of

the following layout managers?

A) FlowLayout

B) BoxLayout

C) GridLayout

D) BorderLayout

E) you could use any of the above

35) What is wrong with the following message to create a BoxLayout for the JPanel jp?

jp.setLayout(new BoxLayout(BoxLayout.X_AXIS));

A) X_AXIS is not a valid constant for BoxLayout, it should instead be HORIZONTAL

B) Aside from X_AXIS, the constructor also requires a Dimension to determine the size of the

Box

C) Aside from X_AXIS, the constructor also needs a command regarding horizontal glue as in

createHorizontalGlue( )

D) The BoxLayout constructor is lacking a reference to the container that the BoxLayout

manager will govern

E) There is nothing wrong with it at all

36) In which phase of program development would you expect the programmer(s) to create the

pseudocode?

A) Software requirements

B) Software design

C) Software implementation

D) Software testing

E) Could occur in any of the above

37) Which of the following is considered a top-level container?

A) Panel

B) Frame

C) Box

D) Layout Manager

E) A, B, and C

38) The JFrame below has a JBorder created using which of the following BorderFactory

formats?

A) TitledBorder

B) MatteBorder

C) EtchedBorder

D) RaisedBevelBorder

E) LoweredBevelBorder

39) To take 2 borders and use one as an outer border and the other as an inner border, you would

create a

A) compound border

B) nested border

C) split border

D) border factory

E) matte border

40) In which phase of program development would you expect the programmer(s) to determine

the classes and objects needed?

A) software requirements

B) software design

C) software implementation

D) software testing

E) could occur in any of the above

41) If a programmer follows the four phases of program development as intended, which of the

four phases should require the least amount of creativity?

A) software requirements

B) software design

C) software implementation

D) software testing

E) none of the above, all four levels would require equal creativity

7.2 True/False Questions

1) The most important decisions regarding the development of a system are made during the

implementation phase while code is actively being written.

2) Unlike the String class where you must pass a message to an object (instance) of the class, as

in x.length( ), in order to use the Math class, you pass messages directly to the class name, as in

Math.abs( ) or Math.sqrt( ).

3) Assume that the class Bird has a static method fly( ). If b is a Bird, then to invoke fly, you

could do Bird.fly( );.

4) Interface classes cannot be extended but classes that implement interfaces can be extended.

5) If classes C1 and C2 both implement an interface Cint, which has a method whichIsIt, and if

C1 c = new C1( ); is performed at one point of the program, then a later instruction c.whichIsIt(

); will invoke the whichIsIt method defined in C1.

6) Any class can implement an interface, but no classes can implement more than a single

interface.

7) All objects implement Comparable.

8) Formal parameters are those that appear in the method call and actual parameters are those

that appear in the method header.

9) Defining formal parameters requires including each parameters type.

10) It is not possible to test out any single method or class of a system until the entire system has

been developed, and so all testing is postponed until after the implementation phase.