ABAP CREATE OBJECT Statement syntax, information and example SAP source code

CREATE OBJECT

Short Reference

ABAP Syntax:
Defining a Class Implicitly

1 CREATE OBJECT oref [
area_handle ] [ parameter_list ].


Defining a Class Explicitly

2 CREATE OBJECT oref [
area_handle ]
TYPE { class [
parameter_list ] }
| { (name) [
parameter_list | parameter_tables
] }.

What does it do? The statement CREATE OBJECT creates an instance of a class or object and assigns the object reference to the oref reference variables. The instance constructor of the class is called directly after the object is created.
By default, the object is created in the internal session (
heap ) of the current program and remains there for as long as it is required. If no heap references point to the object, which means that
no object reference points to the object,
no data reference can no field symbol points to an instance attribute or to a part of an instance attribute,
and if no method of the object is registered as an event handler, it is deleted by Garbage Collector . The addition area_handle can be used to create the object as a
shared object .
The reference variable oref must be declared as an object reference variable. Instance components of an object created using
CREATE OBJECT can only be accessed using object reference variables (see Data Objects in Operand Positions
).
The addition TYPE can be used to specify the class of the created object. The static type of the object reference variables must be more general than or identical to the class of the created object (in accordance with the rules for
Assignments Between Object Reference Variables ).
In the case of the additions
parameter_list and
parameter_tables , the non-optional input parameters must be filled of the first explicitly implemented instance constructor that is located in the path of the inheritance tree from the instantiated class to the root class object . These additions can also be used to assign return values to the non-class-based exceptions of the instance constructor.
If handleable exception is raised in the runtime environment when the object is created, the object is not created and the object reference variable oref is initialized. If a handleable exception is raised when the object is created in the instance constructor of the class, the object is deleted and the object reference variable oref is initialized.

ABAP_SUBRC_GENERAL
If the statement CREATE OBJECT is executed successfully,
sy-subrc is set to 0. Values other than 0 can occur when specifying EXCEPTIONS in parameter_spec when non-class-based exceptions of the instance constructor are handled.

Latest notes: Instances of a class can be created only where permitted by the addition CREATE of the statement CLASS DEFINITION .
If the reference variable oref specified after CREATE OBJECT is simultaneously passed to the instance constructor, then when this variable is executed, it points to the new object. To pass a r
eference to an existing object to the instance constructor, a different reference variable needs to be used.
The statement CREATE OBJECT creates a heap reference . All references that point to the object or its parts are also heap references and keep the object alive. The same applies to field symbols that point to instance attributes or to their parts.
When a class is used, the instance operator NEW acts like the statement CREATE OBJECT oref TYPE class and can be used in general expression positions .
The return code sy-subrc is set to 0 if the statement is successful because the instance constructor is called. sy-subrc is set each time a method is called
.



Runtime Exceptions

Catchable Exceptions
CX_SY_CREATE_OBJECT_ERROR
ABAP_TEXTID ABSTRCT_CLASS

Reason for error: An attempt was made to instantiate an abstract class.

Runtime error: CREATE_OBJECT_CLASS_ABSTRACT

Reason for error: The class specified in the addition TYPE does not exist.

Runtime error: CREATE_OBJECT_CLASS_NOT_FOUND

Reason for error: The class specified dynamically in TYPE does not match the type of the reference variable.

Runtime error: MOVE_OREF_NOT_CONVERTIBLE

Reason for error: An attempt was made to instantiate a private class externally.

Runtime error: CREATE_OBJECT_CREATE_PRIVATE

Reason for error: An attempt was made to instantiate a protected class externally.

Runtime error: CREATE_OBJECT_CREATE_PROTECTED

Non-catchable Exceptions

Reason for error: A reference must be specified as the target variable.

Runtime error: CREATE_OBJECT_NO_REFTYPE :

Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved