topic Re: constructor in Application Development and Automation Discussions

constructor

Former Member — Wed, 16 Apr 2008 12:35:19 GMT

dear exparts

what is constructor?

Re: constructor

Former Member — Wed, 16 Apr 2008 12:37:12 GMT

Hi,

a constructor in a class is a special block of statements called when an object is created

Implicitly, each class has an instance constructor method with the reserved name constructor and a static constructor method with the reserved name class_constructor.

The instance constructor is executed each time you create an object (instance) with the CREATE OBJECT statement, while the class constructor is executed exactly once before you first access a class.

The constructors are always present. However, to implement a constructor you must declare it explicitly with the METHODS or CLASS-METHODS statements. An instance constructor can have IMPORTING parameters and exceptions. You must pass all non-optional parameters when creating an object. Static constructors have no parameters.

rgds,

bharat.

Re: constructor

Former Member — Wed, 16 Apr 2008 12:38:12 GMT

Hi Frd

Constructor:The constructor method is called automatically when you instantiate the class ( create object statement). You generally pass the parameters of the method in the create object statement.

The constructor creates, initializes, and positions the control.

Example:create object docking_container

exporting

parent = parent

dynnr = dynnr

repid = repid

side = side

extension = extension

style = style

lifetime = lifetime

metric = metric

caption = caption

no_autodef_progid_dynnr = no_autodef_progid_dynnr

exceptions

cntl_error = 1

cntl_system_error = 2

create_error = 3

lifetime_error = 4

lifetime_dynpro_dynpro_link = 5.

Reward Me Points

Pari

Re: constructor

Former Member — Wed, 16 Apr 2008 12:39:48 GMT

Hi,

Constructor method

Implicitly, each class has an instance constructor method with the reserved name constructor and a static constructor method with the reserved name class_constructor.

The instance constructor is executed each time you create an object (instance) with the CREATE OBJECT statement, while the class constructor is executed exactly once before you first access a class.

Static constructor

The static constructor is always called CLASS_CONSTRUCTER, and is called autmatically before the clas is first accessed, that is before any of the following actions are executed:

1) Creating an instance using CREATE_OBJECT

2) Adressing a static attribute using <classname>-><attrbute>

3) Calling a ststic attribute using CALL METHOD

4) Registering a static event handler

5) Registering an evetm handler method for a static event

The static constructor cannot be called explicitly.

Thanks.

Re: constructor

Former Member — Wed, 16 Apr 2008 12:49:26 GMT

HI,

In simple words, Constructor will allocate memory to the instance of the class. Its an method in Object Orientation.

Thanks,

Sriram Ponna.