TAW12 PART-I

Question 1

Pooled table

Answer 1

logical tables that must be assigned to a table pool when they are defined.
Pooled tables are used to store control data.
Several pooled tables are combined in a table pool.
Indexes for non-key fields cannot be created

Question 2

Clustered table

Answer 2

Cluster tables are logical tables that must be assigned to a table cluster when they are defined.
Cluster tables can be used to store control data.
They can also be used to store temporary data or texts, such as documentation. Basically used to hold application data.

Advantage - data is stored in a compressed format, reducing memory space and the landscape network load for retrieving information from these tables.

Native SQL cannot be used on these tables
Database views, join statements or append statements cannot be used on these tables
indexes for non-key fields cannot be created

Question 3

Table Pool

Answer 3

A table pool is a database table on the database made up of many pooled tables.
It contains all rows of the pooled tables assigned to it.
Many to one relationship.

Question 4

Table Cluster

Answer 4

A table cluster is a database table on the database made up of many clustered tables.
Many to one relationship.

Question 5

PAI

Answer 5

Process After Input

Question 6

PBO

Answer 6

Process Before Output

Question 7

Input Checks

Answer 7

In the PAI event, the screen makes a series of automatic input checks. These are carried out before any data is transferred to the ABAP program, and before the screen flow logic is processed.

Question 8

ABAP Dictionary views

Answer 8

A view in ABAP Dictionary is a grouping of columns in one or more database tables in accordance with an application-specific view.
Can be used to restrict database access to specific fields (known as projection) or to specific rows (known as selection).
Views for multiple database tables use joins or subqueries to join these tables and to read the required fields and rows
Usually platform-independent.

Question 9

Four different view types

Answer 9

Database View (Uses inner Join)
Projection Views (outer join)
Maintenance Views (outer join)
Help views (outer join)

Question 10

Search help

Answer 10

objects that you can use to assign input help (F4 Help) to screen fields. You can do this by creating a search help in the ABAP Dictionary and attaching it to the corresponding screen field.

Question 11

Two types of search helps

Answer 11

Elementary search helps, They describe a search path

Collective search helps, combine several elementary search helps

Question 12

Factory method

Answer 12

a static method that creates and then returns (as a parameter) a reference to the object of the class it belongs to

Question 13

RTTI

Answer 13

Runtime Type Identification

A technique for obtaining all information about a data type at runtime.
implemented in ABAP Objects using description objects

Question 14

ABAP Runtime Type Services (RTTS) consists of two components

Answer 14

RTTI

RTTC

Question 15

RTTC

Answer 15

Runtime Type Creation

Provides the methods to create the data objects at runtime with any type definition

Question 16

ABAP RTTS

Answer 16

allows to get the definition of variables or to create them during program execution

Question 17

Field Symbol

Answer 17

A placeholder for data object, which points to the value present at the memory address of a data object. It does not reserve any physical memory space when we declare them. It only points to a data object at run time.

Question 18

Field symbols are of two types

Answer 18

Typed Field Symbol

Generic Field Symbol

Question 19

Typed Field Symbol

Answer 19

Specific field symbol declaration

FIELD-SYMBOLS: TYPE i.

Question 20

Generic Field Symbol

Answer 20

Generic field symbol declaration

FIELD-SYMBOLS: TYPE ANY.

Question 21

Data references

Answer 21

Point to any data objects or to their parts (components, rows of internal tables, or sections specified by offsets and lengths).

Nothing but pointers. It stores the memory address of any data object. But to access the actual data object which data reference is pointing to, we first need to deference it using dereferencing operator ->*.

Question 22

Field Symbol vs Data references

Answer 22

Field symbol is a placeholder for data object which it is assigned and points to the content of data object, so it can be used at any operand position (no need to dereference it) and works with the content of the referenced memory area (value semantics).

Data references are pointers to data objects and it contains the memory address of data object (reference semantics). Data reference cannot be used at operand position directly; it should be dereferenced first.

Question 23

two types of data references

Answer 23

Typed Data Reference,

Generic Data Reference

Question 24

Typed Data Reference

Answer 24

DATA lr_num TYPE REF TO i.

CREATE DATA lr_num.

Question 25

Generic Data Reference

Answer 25

DATA: lr_num TYPE REF TO data. CREATE DATA lr_num TYPE i lr_num->* cannot be directly used at operand position So you have to use a field symbol to dereference it

Question 26

What is unique about a functional method?

Answer 26

``` It can contain an exporting parameter It must contain a returning parameter It can contain an importing parameter It can contain a changing parameter It can be used in logical expressions ```

Question 27

What does the Refactoring Assistant allow you to do?

Answer 27

Move between classes and interfaces | Move components between superclasses and subclasses

Question 28

In a subclass, you want to redefine a method of the super class. Which of the following conditions must be fulfilled?

Answer 28

``` The super class method is an instance The subclass method has same visibility as the super class method ```

Question 29

You implemented a subclass that inherits the instance constructor from it superclass What can you do with the inherited constructor?

Answer 29

Change the signature | Redefine the implementation

Question 30

``` You add the CREATE PROTECTED addition to a class definition. From where you can instantiate the class? ```

Answer 30

``` From a child class From a friend class From the class itself ```

Question 31

You have the following class definition CLASS CL_AIRPLANE DEFINITION PUBLIC SECTION. METHOD : set_passengers. PROTECTED SECTION. CONSTANTS c_pos type i. METHODS get_passengers. PRIVATE SECTION. DATA mv_passengers TYPE i, METHODS set_attribures. ENDCLASS. Which components can be addressed directly from a subclass of class CL_AIRPLANE?

Answer 31

C_POS SET_PASSENGERS GET_PASSENGERS

Question 32

What can you use to achieve polymorphism?

Answer 32

Inheritence

Question 33

When you define local classes in ABAP, which syntactical sequence must you follow?

Answer 33

PUBLIC, PROTECTED, PRIVATE

Question 34

A static element... Static attributes...

Answer 34

...is the same across all instances of the class. There is only one static attribute across all instances of the class ...are declared with the CLASS-DATA statement

Question 35

You are writing a program that uses ABAP class. Which components of the class can you create directly from the program?

Answer 35

Only public components

Question 36

What can be part of the signature of an instance constructor?

Answer 36

Import parameters | Exceptions

Question 37

Which steps are needed when implementing the singleton concept for class instantiation with minimum coding?

Answer 37

``` Define the instantiation of the class as private Save the instance of the class in a static attribute Create an instance of the class in a static constructor ```

Question 38

Which of the following steps are required to set up a shared memory area?

Answer 38

``` Set the root object Call the attach_for_write method of area root class Generate an area root class ```

Question 39

For which of the following requirements can you implement a functional method?

Answer 39

A private static helper method that returns a single value as the result of an alogrithm A factory method that returns an object reference

Question 40

What must you do to create a singleton class?

Answer 40

``` Set the class instantiation to the private Create object in static method of class itself ```

Question 41

Which of the following are valid combinations of event visibility and handler method visibility?

Answer 41

Public event and protected handler | Private event and private handler

Question 42

Which components of the class can be accessed in the implementation of a static method in that class?

Answer 42

Constants | Types

Question 43

You created a class by inheriting from superclass. The superclass contains a public instance method do_something. You want to redefine method do_something .

Answer 43

Leave the signature of method unchanged

Question 44

Which method of passing parameters is preferred for its performance?

Answer 44

Pass by reference

Question 45

What statement dynamically changes the data type of field z1?

Answer 45

Assign z1 to casting

Question 46

You change a SAP standard global class by defining a post-method for the SAP method. The original SAP method has an exporting parameter named PAR1. What type of parameter is PAR1 in post-method?

Answer 46

Changing

Question 47

How would you define a method of an ABAP class to prevent this method from being available in a subclass?

Answer 47

Private

Question 48

What happens when an authorization check fails?

Answer 48

The system field SY-SUBRC is set to a value other than zero

Question 49

Which of the following features do you have to consider when you use shared objects?

Answer 49

Data is saved as attributes of objects Memory bottlenecks result in runtime errors and have to be caught Concurrent read accesses are supported

Question 50

You call a lock module. Which exceptions could the lock module raise when a logical lock cannot be set?

Answer 50

SYSTEM_FAILURE | FOREIGN_LOCK

Question 51

You want to loop over an internal table without copying each table row to a work area. How can you achieve this using a field symbol?

Answer 51

LOOP AT ASSIGNING .ENDLOOP

Question 52

You have created the following: A class with an event definition A handler class with method ON_EVT that handles this event. A report that instantiate the handler class. A message statement that raises an exception However the report doesn't react to the event. How do you analyze this issue?

Answer 52

Check if the implementation of the handler method ON_EVT contains the desired logic Check if the event is triggered by setting a breakpoint at the RAISE_EVENT statement Check if the handler method is registered to the correct event

Question 53

You defined data reference z1 generically. | Which statement would you use to access the content of the referenced variable?

Answer 53

Assign z1->* to

Question 54

``` You have 2 objects: O1 of type class C1 and O2 of type class C2. Class C2 is a subclass of class C1. Which of the following statements implements a widening cast? ```

Answer 54

O1=O2

Question 55

What character is used as a symbol for the operand type in an expression?

Answer 55

#

Question 56

Which statements are considered obsolete and cannot be used in ABAP Objects? Please select all the correct answers that apply.

Answer 56

Data...type..occurs loop at dbtab tables

Question 57

You use Unified Modelling language (UML) to design your classes. You want to describe the message exchange between objects. Which diagram can you use?

Answer 57

sequence diagram

Question 58

You enhance an SAP standard global class by defining a post-method for an SAP method. The original SAP method has an EXPORT parameter named PARM1.Which parameters does the post-method have?

Answer 58

A CHANGING parameter named PARM1

Question 59

A class is defined as follows CLASS my_class DEFINITION PUBLIC SECTION METHODS do_something EVENTS state_changed CLASS-Methods static1 PRIVATE SECTION TYPES t_table Type Standard table OF1001 CONSTANTS gc_canst TYPE I VALUE 1 ENDCLASS. Which components of the class can static method static1 address directly?

Answer 59

gc_const constant t_table type