OO Fundamentals Assessment

Resources > OO Fundamentals Assessment

This is not a quiz, but an assessment. The purpose is to help you determine if your basic Object-Oriented knowledge is sufficient for you to gain the most from our Design Patterns Explained course, or if you should use some of our online materials and suggested readings to get up to speed beforehand.
Don't guess! The assessment is really for you, so be honest and answer those questions that you feel confident about.
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1. Which of these is the best description of an object:

a. data with functionality

b. functionality with data

c. an entity in the problem domain, with well-defined responsibilities

d. a way of "packaging" a function or subroutine with its own namespace

e. I don't know

2. The most useful definition of encapsulation is:

a. keeping data and functions together

b. hiding the details of the implementing code

c. hiding the variables the object uses

d. hiding in general, hiding anything

e. I don't know

3. Which of the following statements is true:

a. objects communicate with each other using side-effects

b. each object can communicate with one other object only

c. objects send messages to each other

d. objects are designed to stand alone

e. I don't know

4. What is meant when we say class X inherits from class Y:

a. class X gets all data and functionality from class Y

b. class X gets all public and protected data and functionality from class Y

c. class X gets only data from class Y

d. class X gets only functionality from class Y

e. I don't know

5. Polymorphism is:

a. specialization through inheritance

b. casting an object to its superclass

c. treating all subclasses of a given superclass as the superclass

d. a given class can be cast to a variety of types

e. I don't know

6. Static members are:

a. members of the class, but available to instances

b. members of the class, not available to instances

c. state members that can vary per instance

d. state members that cannot vary at all

e. I don't know

7. Which of the following statements is not true:

a. object orientation improves the clarity of a design

b. object orientation makes maintenance easier

c. object orientation improves performance

d. object orientation increases the lifespan of a system

e. I don't know

8. In inheritance:

a. a class inherits members from its immediate parent only

b. a class inherits members from its immediate parent only, unless it overrides them

c. a class inherits all members from its ancestry, unless they are over-ridden

d. a class inherits all members from its ancestry, unless it overrides them

e. I don't know

9. The process of instantiation consists of:

a. a new object is created, then its constructor is called immediately

b. the class constructor is called, which creates the object

c. a new object is created, then its constructor is called when it is first referenced

d. memory is allocated, but the object is not created until it is first referenced

e. I don't know

10. Redundancy in a system is a problem if:

a. There is redundancy of function, but not of state

b. The code will ever have to be maintained (ie, always)

c. The redundant code appears in 3 or more places

d. Redundancy is not a problem in OO

e. I don't know

11. If an instance method alters a static member:

a. all instances will see the new value if they access the member

b. only the given instance will see the new value if it accesses the member

c. instance methods may not alter static members

d. static members may not be altered

e. I don't know

12. If a static method directly alters an instance member:

a. all instances will see the new value if they access the member

b. only the given instance will see the new value if it accesses the member

c. static methods may not alter instance members directly

d. instance members may not be altered

e. I don't know

13. In good OO design, it is advisable to:

a. make class members private only when necessary

b. make class members public only if they are static

c. make class members protected only if they are part of the interface

d. make class members private whenever possible

e. I don't know

14. The switch statement is acceptable in OO:

a. never – always use polymorphism to vary behavior

b. when only two cases are indicated

c. when the switch variable is not used in another switch

d. when the class is final only

e. I don't know

15. Is it valid for a class to hold a reference to an instance of its own type?:

a. yes, a static member may hold a reference to any instance type

b. no, a class may not hold a reference to its own type

c. no, unless it's instantiated in the static constructor

d. no, only an instance may hold a reference to an instance

e. I don't know

16. The state of an object refers to:

a. whether or not it is fully-constructed

b. the number of instances created of a given class

c. whether a reference is held to the object by another object

d. the value of its variable members at a given point in time

e. I don't know

17. When a reference to an instance is upcast to its parent type:

a. the instance is converted to the parent type

b. the instance remains the same, but only public methods defined in the parent type may be called on it

c. a new instance is created of the parent type

d. this is not allowed

e. I don't know

18. When a reference is down-cast to its derived type:

a. the instance is converted to the derived type

b. the instance remains the derived type, but all public methods may be called

c. an “invalid cast” exception will always be thrown

d. this is not allowed

e. I don't know

19. In object-oriented languages, global variables:

a. can only be accessed by static methods

b. can only be accessed by instance methods

c. can only be accessed by other global entities

d. are discouraged, and usually not supported directly by the language

e. I don't know

20. Performance issues:

a. are universally critical, and should be addressed early in design

b. are universally critical, and should be addressed late in design

c. are sometimes critical, and should be addressed when they occur, through tuning

d. are not critical, can be addressed through better technology, and should therefore be ignored in design

e. I don't know

Reveal Answers

|1. c. |2. d.|3. c.|4. a.|5. c.|6. a.|7. c.|8. c.|9. a.|10. b.|11. a.|12. c.|13. d.|14. c.|15. a.|16. d.|17. b.|18. b.|19. d.|20. c.|

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