TAW10 -Week 2

1. The concept of restricting direct access to data via hidden internal processes is best represented by which term?

Instantiation

Encapsulation

Inheritance

Polymorphism

2. Select the term used for Classes that can implement the same method differently

Polymorphism

Inheritance

Encapsulation

Casting

Instantiation

3. Where are the methods of a class implemented

Object instantiation part of a program

Implementation part of a class

Definition part of Class

Call method of the Class

4. What statement will request memory to be allocated to an object

Call Constructor

Create Object

Call Method

Create Constructor

5. Refer to the following code and indicate which statements are true:

Data: cl_container type ref to cl_gui_custom_container,
cl_grid type ref to cl_gui_alv_grid.

Cl_grid points to the object that communicates with the ALV grid control

Cl_grid points to the object that communicates with the container control

Cl_container points to the object that communicates with the ALV grid control

Cl_container points to the object that communicates with the container control

Submit

6. Where is the visibility of class components defined

Object Instance

Class Methods

Class Implementation

Class Definition

7. Initializing an object in a subclass requires that the constructor of the superclass is first called. Identify the correct syntax.

Call Method Super Constructor

Call Method Super->Constructor

Call Method Constructor

Call Method Constructor->Super

8. What is true about classes and objects in Object oriented ABAP

Classes are an instance of an object

Objects can change their class

Class is a template for an object

Objects are an instance of a class

Submit

9. The syntax for static method specification

Call method class name->method

Call method class name=>method

Call class-method

Call Method->class name

10. A MOVE_CAST_ERROR runtime error just occurred. Identify the cause

Super class and subclass both point to an instance of the same class type

Casting a super class to a subclass when superclass does not point to an instance of the subclass type

Subclass reference variable corresponds to the superclass reference variable

Super class method is called from the subclass

11. Identify the one addition that is not part of the interface of a method

Result

Exception

Importing

Returning

12. What can be said about the visibility of attributes in the following code:

CLASS lcl_course DEFINITION. PUBLIC SECTION.
Data: name type string. PRIVATE SECTION.
Data: price type course-price. ENDCLASS.

Price is protected from outside access

Price is available to methods inside the class

Name is available to methods only inside the class

Name is protected from outside access

Submit

13. Identify the statements that best describe the visibility of classes

Local Classes are available only to the program where the class is defined

Global classes are centrally available to all ABAP programs

Local Classes are available only to programs in the same development class

Global Classes are available only from programs belonging to the same development class

Submit

14. What is contained in a class that does not exist in an interface

Implementation

Attributes

Method

Definition

15. How can a program access private attributes of an object

By methods of a different object within the same program

Only by methods of the specific object itself

By methods of a different instance of the same object

From outside the class

16. What mechanism is used to define common components of different classes in one place

Create Object

Class Definition

Interface

Raise Event

17. What happens when the Set handler command is executed

An instance of the event is created

The Event Handler Method is registered

The Event is triggered

The Event is handled

18. What can be said about the lifetime of an object

All answers are correct

An object exists for as long as it is being used in the program

An object exists for as long as at least one reference points to it

An object exists as long as at least one method of the object is registered as an event handler.

19. What is the only component that is implemented in the implementation part of a class

Method

Attribute

Object

Interface

Event

20. Class A provides friendship to Class B. Class B provides friendship to Class C. Identify the valid friend relationship.

C is a friend of A

C is friend of B

A is friend of B and C

B and C are friends of A

B is friend of A

Submit

21. Mark the operator used to widen cast of a class

=>

=?

->

?=

=

22. In the following method, what other parameters are allowed

CLASS lcl_course DEFINITION.
PUBLIC SECTION.
    METHODS: get_course_name
               IMPORTING im_name type string
               Returning value(student_count) type I .
ENDCLASS.

Exceptions

Exporting

Changing

Receiving

23. How do you call the method in a superclass that has the same name as a redefined method in the subclass ?

Call Method Superclass->mymethod.

Call Method Super->mymethod

Call Method mymethod

You can't. Only the redefined method can be recalled

24. In object orientation, the term USER includes

Events

Methods

Attributes

All of the answers are correct

None of the answers are correct

25. Changing the view of an instance of a class with more details is referred to as

Narrowing cast

Up cast

Widening cast

Dynamic referencing

26. Using example code below, choose the correct syntax for the redefined method:

Class lcl_car definition. Public Section.
method calc_speed importing im_distance type ty_dist. End Class.

Method calc_speed importing im_distance.

Method calc_speed Redefinition.

Method calc_speed importing im_distance Redefinition

Method calc_speed Redefinition importing im_distance type ty_dist.

27. What syntax provides access to individual components of a class within the class

CALL METHOD object instance->ME->

ME->

CALL METHOD ME->

Object instance->ME

Submit

28. Select the answers that apply to static methods and instance methods

Instance methods MUST be addressed by object ref after instantiation

Static methods MUST be addressed by object reference after instantiation

Instance methods MUST be addressed class name

Static methods MUST be addressed by class_name even when object in instantiated

Submit

29. What implications exists when private components of a class are changed

Users of the private components must change their interface

Any programs accessing the class must also change

Programs are insulated from change

None of the answers are correct

30. A program needs to gain access to the public attributes of calss lcl_course. Identify the statements that are valid.
class lcl_course definition. public section.
    data: name(15) type c value 'ABAPObjects101'.
    class-data price type p value 100. private section.
    data: category(10) type C value 'Objects'. endclass. data: course1 type ref to lcl_course,
      course_name type string,
      course_price type p,
      course_category type string. Create Object course1.

Course_price = lcl_course=>price

Course_name = course1->name

Course_name = course1=>name.

Course_name = name

Course_price = lcl_course->price

Submit

31. Pick the syntax for a funtional method with only 1 parameter

Refvar->method returning()

Refvar->method(p1)

Refvar->method(im = p1)

Refvar->method receiving()

Submit

32. Refer to the following code and select the VALID method call:

Class lcl_course definition. Public section.
    data: course_name(12) type c.
    methods: display_price
             importing im_course_name type string. Private section.
    Data: price type P value 100.
    constants: c_objects101(10) type c value 'OBJECTS101'. endclass. class lcl_course implementation. method display_price.
    course_name = im_course_name.
    If course_name = c_objects101.
      Write: price.
    Endif.
endmethod. endclass. Data obj_course type ref to lcl_course. start-of-selection. create object obj_course.

Call method obj_course->display_price exportingim_course_name = 'OBJECTS101'.

Call method obj_course->display_price importingim_course_name = 'OBJECTS101'.

Call method obj_course->display_price exportingcourse_name = 'OBJECTS101'.

Call method obj_course->display_price exportingim_course_name = c_objects101.

33. What is possible with a subclass in an inheritance relationship to the superclass

The subclass can remove components of the superclass

Can add new components to the subclass

Can provide inherited methods with new implementations (redefinition)

Inherits all the characteristics of the superclass

Submit

34. Identify the line that contains the valid use of the READ-ONLY addition.

class lcl_course definition. 10 public section.
20   Data: Price(3) type p decimals 2
                    value 100 READ-ONLY. 30   Types: type_category(15) type C READ-ONLY.
40   Constants: write_position type I value 10 READONLY. 50 private section.
60   data: category(15) type C READ-ONLY,
70   class-data: course_count type I READ-ONLY. endclass.

30

60

50

20

40

35. An inherited class:

Can remove superclass components

Can add components over and above the superclass

Can access the inherited private components

Can redefine the public methods of the superclass

Cannot access the protected components

Submit

36. Identify the valid statements that will write out the Static Attributes in the following code:

class lcl_course definition. public section.
   data: name(15) type c value 'ABAPObjects101'.
    class-data price type p value 100. private section.
    data: category(10) type C value 'Objects'. endclass. data: course1 type ref to lcl_course,
      course_name type string,
      course_price type p,
      course_category type string.

Course_price = lcl_course=>price. Write course_price.

Write: price.

Write lcl_course=>price.

Write lcl_course->price

37. Identify the Characteristics of a Final Class

No answers are correct

All answers are correct

Methods cannot be explicitly designated as FINAL

Contains final methods implicitly

Cannot have subclasses

38. A program needs to gain access to the public attributes of class lcl_course. Identify the statements that are valid.

class lcl_course definition.
public section.
    data: name(15) type c value 'ABAPObjects101'.
    class-data price type p value 100. private section.
    data: category(10) type C value 'Objects'. endclass. data: course1 type ref to lcl_course,
      course_name type string,
      course_price type p,
      course_category type string. INSTANTIATION OMITTED

Course_name = name

Name can not be accessed unless course1 is instantiated

Course_name = course1=>name

Course_name = course1->name

Course_price = lcl_course=>price

Submit

39. Identify the ABAP OO Event signature protocols

Events can only have exporting Parameters

Exporting paramets can only be passed by reference

Exporting parameters can only be passed by value

Events can only have importing Parameters

Submit

40. Your program has registered several handler methods. How does the program know what methods are available for execution when an event is triggered.

The system looks for registered handler methods In the registry table and processes those that are registered for the event

The methods defined in the Class Definition listen for raised events and respond when an event is triggered

It is determined by the RAISE Event command

41. Using the UML modeling language for ABAP OO design, refer to the following and indicate the visibility of the components

-------------------
| cl_myclass      |
-------------------
| +city           |
| #address        |
|-----------------|
| + get_city()    |
| - display_addr()|
|                |
|-----------------|

Get_city is a public attribute

Address is protected attribute

Display_address is a public method

Display_address is a static public method

Display_address is a private method

Submit

42. Local Class lcl_course has been defined in program belonging to development class ZCL. What is the key entry in the repository table TADIR

R3TR CLASS

R3TR LOCAL CLASS

None of the answers are correct

R3TR ZCL CLASS

R3TR lcl_class

43. A syntax for instance method specification is

Call method Objref=>method

Call Method->Objref

Call Method (from within another instance method)

Call method Objref->method

Submit

44. In the context of Triggering and Handling of Events, mark those which apply

Events can be triggered with the "Trigger Event" command

Methods must be registered to an event in order to be called when the event is triggered

An event is defined in the Implementation of a Class

Event Triggering using "Raise Event" can be issued in a method

Submit

45. When redefining methods in a subclass, what is allowed ?

Code can be changed

Only Instance methods

Signature can be changed

Private Static methods

Submit

46. Mark the item that is NOT true about the handler table

Event handler methods are called in the sequence that they were registered in the handler table

There is a separate handler table for every object that has defined events

Registered Methods in the handler table can only be triggered by RAISE EVENT i.e. not by CALL METHOD

A single SET Handler command can be used to register multiple handler methods in the handler table

47. In the context of polymorphism and interfaces, mark the item that is NOT true

The user is protected from the actual implementations

Interfaces describe the point of contact of a class

Interfaces contain their own implementation part

A class can implement any number of interfaces

48. Mark the invalid attribute definitions.

class lcl_course definition. 10   public section.
20    Data: school(20) type c,
30           Supervisor type string value ‘ADAMS’,
40           Price(3) type p decimals 2 value 100 READ-ONLY. 50    types: type_category(15) type c,
60            type_name(10) type c. 70     constants: write_position type i value 10.
80     class-data: course_count type i. 90 private section.
100   data: category(15) type c,
110         name(10) type c.
120         courseid like mara-matnr. endclass.

30, 120

30, 80

40, 70

70, 80

40, 120

49. What triggers an event

Raise Event inside the Method

Call Method

None of the answers are correct

Raise Event

All answers are correct

50. Global Class cl_course has been defined using the class builder. The development class is ZCL. What is the key entry in the repository table TADIR.

R3TR ZCL CLASS

None of the answers are correct

R3TR CLAS cl_course

R3TR cl_course

R3TR GLOB CLASS

51. A public attribute 'color' is added to a superclass. A subclass already has the same attribute 'color' What is the outcome?

The sublass is invalidated.

A syntax message will occur

The superclass is invalidated

A runtime error will occur

Submit

52. Finish the following sentence so that it is TRUE.

Static Components in an inheritance relationship....

Does not allow for methods to be redefined in subclasses

Cannot be shared

Exist once per roll area

Receive their own copy of the static attribute for each subclass

Submit

53. Identify the statement about Global Classes that is NOT true

Class Builder can be used to test global classes

A method to be transported is identified in transport organiser as LIMU METH

Programs that are available to Global Classes must be associated in Class Builder

Global classes are stored in TADIR with key R3TR CLAS

Access to a global class is done as a reference variable using TYPE REF TO

54. Mark the items that characterize the Methods of a Class

Can change the state of an object

Can access only public attributres in their class

Can access all atributes in their class

Can be defined with a parameter interface

Only pass return codes to the calling program

Submit

55. Identify the valid rule when calling public methods from within the class

When calling a static method, the class name is required

When calling an instance method, the => operator is required

When calling a static method, the class name can be omitted

Private methods can not call public methods

56. Refer to the following code and identify the statements that are TRUE.

CLASS lcl_course DEFINITION.
PUBLIC SECTION.
    METHODS: get_course_name IMPORTING im_name type string.
    CLASS-METHODS: list_prices_and_discounts.
ENDCLASS. CLASS lcl_course IMPLEMENTATION.
METHOD get_course_name.
ENDMETHOD. METHOD list_prices_and_discounts.
ENDMETHOD.
ENDCLASS. Data: course1 type ref to lcl_course,
      course2 type ref to lcl_course. Start-of-selection. Create object course1.
Course2 = course1.

Method list_prices_and_discounts is a static method

Method list_prices_and_discounts can only be called once

List_prices_and_discounts is a instance method

Only one instance of method get_course_name exists

Only one instance of method list_prices_and_discountsexists

Submit

57. Indentify the requirements that determine when an object gets deleted by garbage collection

When all active objects are marked

When none of its methods are registered as event handlers

When objects can no longer be addressed from main memory

When there are no more references pointing to an object

Submit

58. Define Polymorphism

It’s a characteristic when methods of the same class react differently to the same method call

It’s one of the main strengths of inheritance

It’s a characteristic when methods from different classes react differently to the same interface

The same method is implemented in different ways by redefining the method in subclasses

It’s a characteristic when objects from different classes react differently to the same method call

Submit

59. What are the rules for Event parameters

EXPORTING Parameters for events can only be passed by value

EXPORTING Parameters for events can only be passed by reference

Events can only have EXPORTING parameters

Events also allow RETURNING parameters

Submit

Taw10 -week 2

1. The concept of restricting direct access to data via hidden internal processes is best represented by which term?

2.

What first name or nickname would you like us to use?

2. Select the term used for Classes that can implement the same method differently

3. Where are the methods of a class implemented

4. What statement will request memory to be allocated to an object

5. Refer to the following code and indicate which statements are true: Data: cl_container type ref to cl_gui_custom_container, cl_grid type ref to cl_gui_alv_grid.

6. Where is the visibility of class components defined

7. Initializing an object in a subclass requires that the constructor of the superclass is first called. Identify the correct syntax.

8. What is true about classes and objects in Object oriented ABAP

9. The syntax for static method specification

10. A MOVE_CAST_ERROR runtime error just occurred. Identify the cause

11. Identify the one addition that is not part of the interface of a method

12. What can be said about the visibility of attributes in the following code: CLASS lcl_course DEFINITION. PUBLIC SECTION. Data: name type string. PRIVATE SECTION. Data: price type course-price. ENDCLASS.

13. Identify the statements that best describe the visibility of classes

14. What is contained in a class that does not exist in an interface

15. How can a program access private attributes of an object

16. What mechanism is used to define common components of different classes in one place

17. What happens when the Set handler command is executed

18. What can be said about the lifetime of an object

19. What is the only component that is implemented in the implementation part of a class

20. Class A provides friendship to Class B. Class B provides friendship to Class C. Identify the valid friend relationship.

21. Mark the operator used to widen cast of a class

22. In the following method, what other parameters are allowed CLASS lcl_course DEFINITION. PUBLIC SECTION. METHODS: get_course_name IMPORTING im_name type string Returning value(student_count) type I .ENDCLASS.

23. How do you call the method in a superclass that has the same name as a redefined method in the subclass ?

24. In object orientation, the term USER includes

25. Changing the view of an instance of a class with more details is referred to as

26. Using example code below, choose the correct syntax for the redefined method: Class lcl_car definition. Public Section. method calc_speed importing im_distance type ty_dist. End Class.

27. What syntax provides access to individual components of a class within the class

28. Select the answers that apply to static methods and instance methods

29. What implications exists when private components of a class are changed

31. Pick the syntax for a funtional method with only 1 parameter

33. What is possible with a subclass in an inheritance relationship to the superclass

35. An inherited class:

37. Identify the Characteristics of a Final Class

39. Identify the ABAP OO Event signature protocols

40. Your program has registered several handler methods. How does the program know what methods are available for execution when an event is triggered.

41. Using the UML modeling language for ABAP OO design, refer to the following and indicate the visibility of the components -------------------| cl_myclass |-------------------| +city || #address ||-----------------|| + get_city() || - display_addr()|| ||-----------------|

42. Local Class lcl_course has been defined in program belonging to development class ZCL. What is the key entry in the repository table TADIR

43. A syntax for instance method specification is

44. In the context of Triggering and Handling of Events, mark those which apply

45. When redefining methods in a subclass, what is allowed ?

46. Mark the item that is NOT true about the handler table

47. In the context of polymorphism and interfaces, mark the item that is NOT true

49. What triggers an event

50. Global Class cl_course has been defined using the class builder. The development class is ZCL. What is the key entry in the repository table TADIR.

51. A public attribute 'color' is added to a superclass. A subclass already has the same attribute 'color' What is the outcome?

52. Finish the following sentence so that it is TRUE.Static Components in an inheritance relationship....

53. Identify the statement about Global Classes that is NOT true

54. Mark the items that characterize the Methods of a Class

55. Identify the valid rule when calling public methods from within the class

57. Indentify the requirements that determine when an object gets deleted by garbage collection

58. Define Polymorphism

59. What are the rules for Event parameters

5. Refer to the following code and indicate which statements are true:

Data: cl_container type ref to cl_gui_custom_container,
cl_grid type ref to cl_gui_alv_grid.

12. What can be said about the visibility of attributes in the following code:

CLASS lcl_course DEFINITION. PUBLIC SECTION.
Data: name type string. PRIVATE SECTION.
Data: price type course-price. ENDCLASS.

22. In the following method, what other parameters are allowed

CLASS lcl_course DEFINITION.
PUBLIC SECTION.
METHODS: get_course_name
IMPORTING im_name type string
Returning value(student_count) type I .
ENDCLASS.

26. Using example code below, choose the correct syntax for the redefined method:

Class lcl_car definition. Public Section.
method calc_speed importing im_distance type ty_dist. End Class.

41. Using the UML modeling language for ABAP OO design, refer to the following and indicate the visibility of the components

-------------------
| cl_myclass |
-------------------
| +city |
| #address |
|-----------------|
| + get_city() |
| - display_addr()|
| |
|-----------------|

52. Finish the following sentence so that it is TRUE.

Static Components in an inheritance relationship....