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最新的 SAP Certified Associate C_ABAPD_2309 免費考試真題 (Q83-Q88):

問題 #83
Refer to the Exhibit.

with which predicate condition can you ensure that the CAST will work?

A. IS INSTANCE OF
B. IS BOUND
C. IS SUPPLIED
D. IS NOT INITIAL

答案：A

解題說明：
The predicate condition that can be used to ensure that the CAST will work is IS INSTANCE OF. The IS INSTANCE OF predicate condition checks whether the operand is an instance of the specified class or interface. This is useful when you want to perform a downcast, which is a conversion from a more general type to a more specific type. A downcast can fail if the operand is not an instance of the target type, and this can cause a runtime error. Therefore, you can use the IS INSTANCE OF predicate condition to check whether the downcast is possible before using the CAST operator12. For example:
The following code snippet uses the IS INSTANCE OF predicate condition to check whether the variable g_super is an instance of the class lcl_super. If it is, the CAST will work and the variable g_sub1 will be assigned the value of g_super.
DATA: g_super TYPE REF TO lcl_super, g_sub1 TYPE REF TO lcl_sub1. IF g_super IS INSTANCE OF lcl_super. g_sub1 = CAST #( g_super ). g_sub1->method( ... ). ENDIF.
You cannot do any of the following:
IS SUPPLIED: The IS SUPPLIED predicate condition checks whether an optional parameter of a method or a function module has been supplied by the caller. This is useful when you want to handle different cases depending on whether the parameter has a value or not. However, this predicate condition has nothing to do with the CAST operator or the type of the operand12.
IS NOT INITIAL: The IS NOT INITIAL predicate condition checks whether the operand has a non-initial value. This is useful when you want to check whether the operand has been assigned a value or not. However, this predicate condition does not guarantee that the CAST will work, because the operand may have a value but not be an instance of the target type12.
IS BOUND: The IS BOUND predicate condition checks whether the operand is a bound reference variable. This is useful when you want to check whether the operand points to an existing object or not. However, this predicate condition does not guarantee that the CAST will work, because the operand may point to an object but not be an instance of the target type12.

問題 #84
You have a superclass superl and a subclass subl of superl. Each class has an instance constructor and a static constructor. The first statement of your program creates an instance of subl. In which sequence will the constructors be executed?

答案：

解題說明：

Explanation:
The sequence in which the constructors will be executed is as follows:
* Class constructor of superl. This is because the class constructor is a static method that is executed automatically before the class is accessed for the first time. The class constructor is used to initialize the static attributes and components of the class. The class constructor of the superclass is executed before the class constructor of the subclass, as the subclass inherits the static components of the superclass12
* Class constructor of subl. This is because the class constructor is a static method that is executed automatically before the class is accessed for the first time. The class constructor is used to initialize the static attributes and components of the class. The class constructor of the subclass is executed after the class constructor of the superclass, as the subclass inherits the static components of the superclass12
* Instance constructor of superl. This is because the instance constructor is an instance method that is executed automatically when an instance of the class is created using the statement CREATE OBJECT.
The instance constructor is used to initialize the instance attributes and components of the class. The instance constructor of the superclass is executed before the instance constructor of the subclass, as the subclass inherits the instance components of the superclass. The instance constructor of the subclass must call the instance constructor of the superclass explicitly using super->constructor, unless the superclass is the root node object12
* Instance constructor of subl. This is because the instance constructor is an instance method that is executed automatically when an instance of the class is created using the statement CREATE OBJECT.
The instance constructor is used to initialize the instance attributes and components of the class. The instance constructor of the subclass is executed after the instance constructor of the superclass, as the subclass inherits the instance components of the superclass. The instance constructor of the subclass must call the instance constructor of the superclass explicitly using super->constructor, unless the superclass is the root node object12 References: Constructors of Classes - ABAP Keyword Documentation, METHODS - constructor - ABAP Keyword Documentation

問題 #85
Given the following Core Data Services View Entity Data Definition:?demo_cds_assoc_spfli? data source referenced in line #4 contains a field ?connid? which you would like to expose in the element list. Which of the following statements would do this if inserted on line #8?

A. _spfli.connid,
B. demo_cds_assoc_spfli-connid,
C. spfli-connid,
D. demo_cds_assoc_spfli.connid,

答案：A

問題 #86
Given the Code:
INTERFACE if1.
METHODS m1.
ENDINTERFACE.
CLASS cl1 DEFINITION.
...
INTERFACES if1.
ENDCLASS.
CLASS cl2 DEFINITION.
...
DATA mo_if1 TYPE REF TO if1.
ENDCLASS.
What are valid statements? (Note: There are 3 correct answers to this question.)

A. Class cl1 implements the interface.
B. Class cl1 uses the interface.
C. In class cl2, the interface method is named if1~m1.
D. Class cl2 uses the interface.
E. In class cl1, the interface method is named if1~m1.

答案：A,B,C

解題說明：
Comprehensive and Detailed Step-by-Step Explanation:
* Interface Implementation in cl1
* The INTERFACES if1 statement in the cl1 definition explicitly declares that cl1 implements the interface if1.
* Therefore, option E is correct.
* Interface Method Naming in cl1
* When an interface is implemented in a class, its methods are accessed using the syntax if1~m1 to distinguish them from other methods in the class.
* This makes option C correct.
* Usage of if1 in cl2
* The DATA mo_if1 TYPE REF TO if1 in cl2 creates a reference variable of type if1. However, it does not mean that cl2 implements or uses the interface if1.
* This makes option B incorrect.
* Interface Method Naming in cl2
* Since cl2 does not implement the interface, it does not inherit its methods. Hence, the method if1~m1 is not available in cl2.
* This makes option A incorrect.
* Class cl1 and Interface Usage
* Class cl1 explicitly states INTERFACES if1, which means it not only implements the interface but also uses it.
* This makes option D correct.
References:
* SAP ABAP Documentation: Interfaces
* SAP Training for Back-End Developer - ABAP Cloud

問題 #87

with which predicate condition can you ensure that the CAST will work?

A. IS INSTANCE OF
B. IS BOUND
C. IS SUPPLIED
D. IS NOT INITIAL

答案：A

解題說明：
The predicate condition that can be used to ensure that the CAST will work is IS INSTANCE OF. The IS INSTANCE OF predicate condition checks whether the operand is an instance of the specified class or interface. This is useful when you want to perform a downcast, which is a conversion from a more general type to a more specific type. A downcast can fail if the operand is not an instance of the target type, and this can cause a runtime error. Therefore, you can use the IS INSTANCE OF predicate condition to check whether the downcast is possible before using the CAST operator12. For example:
* The following code snippet uses the IS INSTANCE OF predicate condition to check whether the variable g_super is an instance of the class lcl_super. If it is, the CAST will work and the variable g_sub1 will be assigned the value of g_super.
DATA: g_super TYPE REF TO lcl_super, g_sub1 TYPE REF TO lcl_sub1. IF g_super IS INSTANCE OF lcl_super. g_sub1 = CAST #( g_super ). g_sub1->method( ... ). ENDIF.
You cannot do any of the following:
* IS SUPPLIED: The IS SUPPLIED predicate condition checks whether an optional parameter of a method or a function module has been supplied by the caller. This is useful when you want to handle different cases depending on whether the parameter has a value or not. However, this predicate condition has nothing to do with the CAST operator or the type of the operand12.
* IS NOT INITIAL: The IS NOT INITIAL predicate condition checks whether the operand has a non- initial value. This is useful when you want to check whether the operand has been assigned a value or not. However, this predicate condition does not guarantee that the CAST will work, because the operand may have a value but not be an instance of the target type12.
* IS BOUND: The IS BOUND predicate condition checks whether the operand is a bound reference variable. This is useful when you want to check whether the operand points to an existing object or not. However, this predicate condition does not guarantee that the CAST will work, because the operand may point to an object but not be an instance of the target type12.
References: 1: Predicate Expressions - ABAP Keyword Documentation - SAP Online Help 2: ABAP - Predicates | SAP Community

問題 #88
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