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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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