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Constructors are methods that are generally called implicitly when a class is instantiated or defined.
This video will teach you about instance and static constructors in ABAP.
Constructors
- Constructors are methods that are not generally called explicitly (CALL METHOD or its short form), but are called implicitly.
- The constructor is a special instance method in a class and is always named CONSTRUCTOR. This abbreviated term actually means the instance constructor.
- The constructor is automatically called at runtime with the CREATE OBJECT statement.
A constructor is necessary when, after the instantiation of a class:
- You need to allocate resources
- You need to initialize attributes
- You need to modify static attributes
- You need to send messages containing the information that a new object was created
Instance Constructors
- Each class can have no more than one (instance) constructor
- The constructor must be defined in the public area
- The constructor’s signature can only have importing parameters and exceptions
- When exceptions are raised in the constructor, instances are not created, so no main memory space is occupied
- Except for one exceptional case, you cannot normally call the constructor explicitly
- There is no destructor in ABAP Objects.
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