Creating a method inside a constructor

Can we create a method inside a Constructor??

Encephalopathic wrote:
uj_ wrote:
Pascal doesn't have classes so it has no constructors either.Its latest incarnation, object pascal / Delphi did. I was working with that in the early '90s.Isn't the relation between Pascal and Object Pascal like that of C to C++?
C didn't become C++. It stays C. And Pascal didn't become Object Pascal. It stays Pascal.
So Pascal doesn't have classes or constructors. A company driven Pascal derivate called Object Pascal has.

Similar Messages

Calling abstract method inside constructor

what will happen if you call abstract method inside a constructor ?

AMARSHI wrote:
Then wat is the purpose of that object then.
When u create an object then the control will move to the default constructor,If there is one. Not all classes have default constructors. Some c'tor will be called though.
inside the constructor u r having an abstract method.
But theere are 2 cases now:
1 the top-level class is an abstract class
2 the abstract class is an inner class.
1. for case 1 , u cannot create an object ,so no need of having the constructor.Yes, you can create an object. You can instantiate a concrete subclass. The abstract parent's constructor is still called, and that c'tor may call an abstract method, which will be implemented in the concrete subclass, or some class between it and the parent.
2.for case 2 u cannot have an object like:
outerClass obj = new innerAbstractClass()I have no idea what you're talking about here.

How can I create a method with throws instruction

Hello Everybody!
How can I create this method inside WebDynpro.
I enter "throws CloneNotSupportedException" manually an it removes always.
What is wrong ?
public java.lang.Object clone( ) throws CloneNotSupportedException{
    //@@begin clone()
     __Tdag__Is_Charactconfig that= (__Tdag__Is_Charactconfig)super.clone();
       return that;
    //@@end
Regards
sas

I only checked in my 7.1 IDE and there this section exists.
If it does not exist in your IDE, just create the method manually in the //@@begin others ... //@@end user-coding-area at the end of the controller class. This solves the issue for methods that are called from inside the controller. For public methods to be called from other controllers, this will not help.
Armin

How to create a byte[] as parameter for a Method inside the Controller

Hi Experts,
I want to create a method getCachedWebResource inside the component controller which has a parameter file which is of type byte[].
But in Netweaver Developer Studio I am not able to create this parameter with type byte[] .
When I try creating a parameter of this type (byte[]) . I get only byte from drop down and below Array type checkbox is disabled.
Please help me in this regards.
I am already highly obliged to his forum with lots of useful answers. Hoping the same this time too
Best Regards,
Roby..

Robert-
There are two ways of achieving this:
1. Create a private getCachedWebResource() method inside your component controller's others section. i.e. do not create a method on the Methods tab, but instead code the method directly into the controller.
2. Create a parameter of type java.lang.Byte[ ] instead of byte[ ]. This can be done by clicking on the Browse button next to the Type and then choosing the Java Native Type radio button. In the Java Native Type input field provide java.lang.Byte. Click on Ok and you should see the Array Type option getting enabled. Check it, and in the method you should convert from java.lang.Byte to byte.
I would stick to option (1)
Cheers-
Atul

Hi How do we create Methods inside the Business objects of Z

Hi Abapers,
                    How do we create Methods inside the Business objects (z objects) and how *** an import parameter or export parameter to be defined for the new Methods.
Regards
Bhaskar Rao.M

Hi Bhaskar,
that ´s not difficult.
Open your Bus.Obj. in SWO1 with CHANGE/EDIT
Click on the "Methods" header line and then use the button for "Create".
If you want to add the method on basis of a function module, choose next in the next pop up. Then the system will offer you the ex/import parameter from the function module. So this is a really simple way.
If you don´t have a FM, it is a little bit more difficult.
Choose No on the quetion about a FM, fill in the next pop up methode name (no blanks allowed).
Dialogue is for user related method (call screen...) synchronous for methods which have to give back a result directly in to the workflow.
After completing the screen the method will be displayed as new method at the end of method list. Now add parameters (first click on the method name, then choose parameter button, same functionality to add program to the method).
Programm:
Code snip:
BEGIN_METHOD ZWFCHECKMIRO CHANGING CONTAINER.
DATA:
      ZBELNR TYPE RBKP-BELNR,
      ZGJAHR TYPE RBKP-GJAHR,
      RESULT TYPE HRP1001-ISTAT,
      BELNR TYPE BKPF-BELNR,
      GJAHR TYPE BKPF-GJAHR,
      BUKRS TYPE BKPF-BUKRS.
to import parameter
SWC_GET_ELEMENT CONTAINER 'Zbelnr' ZBELNR.
SWC_GET_ELEMENT CONTAINER 'Zgjahr' ZGJAHR.
*(or SWC_GET_TABLE)
here add the functionality of your method!
to export parameter
SWC_SET_ELEMENT CONTAINER 'Result' RESULT.
SWC_SET_ELEMENT CONTAINER 'Belnr' BELNR.
*(or SWC_SET_TABLE)
!!! Important: naming convention!!! Use same writing of parameter names in
PARAM area (button PARAMETER) and here in code.
To use your method, change it to implemented after adding your code.
-> Edit -> Change release status -> object type component -> into implemented
(Sorry , have a german screen here, possibly terms are a little bit different.
Hope this helps a little bit.!
regards
Dirk

Global create activity with screenflow and constructor

Hi
Question 1) Is it possible to get data from database (Oracle) in constructor
Execute Screen flow in a row (One fer other) if yes how and if
not how can we do that?
Question 2) Explain how data can be displayed in JSP with BPM Object
Please give simple example.
Thanks in advance

Sorry, I'm not following what you're asking. Screenflows do not have constructors. Is it possible that you mean an instance variable BPM Object's constructor? If this is the case, I'd suggest you instead keep the BPM Object's constructor very lean.
You can run SQL from any Automatic task inside a Screenflow, any Automatic activity inside a process or BPM Object's methods that have their "Server Side Method" property set to "Yes". BPM Object constructors have their "Server Side Method" property set to "No" and cannot be changed. While you could invoke another method from the constructor that is server side, I would not recommend doing it. Almost always you'll want fresh data from the database displayed just prior to a presentation being displayed. If you populate information from a database inside your BPM Object's constructor, the information would be populated when the instance gets created in the Begin activity. If an instance takes 3 weeks to reach the 5th activity in the process, this same stale information populated 3 weeks ago when the object was initialized will be displayed in presentations shown in this activity. Presentations can have an initialization method (method run just before the presentation is shown). Consider using presentation initialization methods to retrieve the latest information from the database.
Hope this helps,
Dan

Why does serializable interface has no methods inside it

Aloha
Can anyone please help me with this....Serializable interface has no methods inside it.So how is it useful to the user.Also if I am writing a class which implements Serializable how does JVM know what to do.?

JoachimSauer wrote:
dannyyates wrote:
[The JVM] doesn't know about serialisation [...]Sorry for the nitpick, but that's not completely true. The JVM needs to know about serialisation at least at little bitNo.
since Serialization creates new objects without the code from the constructrs ever being run. ObjectInputStream loads the classes just like any other code would, although it's obviously reading the serialized stream to get that information... and then calls newInstance() on ObjectStreamClass.
And ObjectStreamClass uses reflection to get a constructor (via java.lang.Class getDeclaredConstructor ) and then uses said java.lang.reflect.Constructor to create a new instance via newInstance()
There is no JVM magic. It is all Java code. (With the exception of what java.lang.reflect.Constructor does because at the point it dives into sun packages but you could do the same by calling java.lang.reflect.Constructor)

Error when calling a method inside a form routine...

Hello experts,
I am trying to call a method inside a form but it is giving me an error. The error is:
Access not possible using 'NULL' object reference.
Anyway, below is my code guys:
START-OF-SELECTION.
DATA: main          TYPE REF TO lcl_main,
        old_and_new   TYPE REF TO lcl_old_and_new,
        check_changes TYPE REF TO lcl_check_changes,
        messages      TYPE REF TO lcl_messages.
CREATE OBJECT: main, old_and_new, check_changes, messages.
      FORM get_orig_contents_of_zts0001                             *
FORM get_orig_contents_of_zts0001.
CALL METHOD main->export_old_recs.
ENDFORM.
Help would be greatly appreciated. Thanks a lot and take care!

Before the "START-OF-SELECTION " just add this sentense :
<b>class lcl_main definition deferred.</b>
CLASS Definition.
ENDCLASS.
CLASS Implementation.
ENDCLASS.
START-OF-SELECTION.
*Do your coding here
<b>in this way we are deferring the class definition for later</b>

Syntax error when creating Overwrite method - implicit enhancement

Hi,
I am working at a customer site, and need to implicitly enhance certain methods. I would like to create an Overwrite Method for the following class/method:
CL_CRM_MKTDEF_DEFAULTS_PERSIST -> HEADER_WITH_KEY_EXITS_IN_DBASE( )
I proceeded in the following way:
Open class CL_CRM_MKTDEF_DEFAULTS_PERSIST in class builder (SE24)
Select menu path Class -> Enhance
Create, or select, enhancement implementation ZCRM_MKTDEF_PRD
Select method HEADER_WITH_KEY_EXITS_IN_DBASE, select menu path Edit -> Enhancement Operation -> Add Overwrite Method
Click on u201CNavigation to Overwrite Exitu201D
After navigating to the Overwrite Exit, I click on "Check" to perform a syntax check (notice, I have not yet implemented any code. Everything so far has been done by the wizard).
Now, I get the following error:
Enhancement Implementation ZCRM_MKTDEF_PRD
Unable to interpret "IS_DEFAULTS_ATTR". Possible causes: Incorrect
spelling or grammar.
When I create Overwrite methods for any other method in the same class, the same error does NOT occur. As far as I can tell, there is nothing special about this method that should cause this error.
I would greately appreciate any help that any of you could give me on this one.
thank you and best regards,
- Marius
PS: Here is my code (which was generated after I followed the outlined steps above) for your reference:
CLASS LCL_ZCRM_MKTDEF_PRD DEFINITION.
PUBLIC SECTION.
CLASS-DATA OBJ TYPE REF TO LCL_ZCRM_MKTDEF_PRD.
DATA CORE_OBJECT TYPE REF TO CL_CRM_MKTDEF_DEFAULTS_PERSIST .
INTERFACES IOW_ZCRM_MKTDEF_PRD.
METHODS:
   CONSTRUCTOR IMPORTING CORE_OBJECT
     TYPE REF TO CL_CRM_MKTDEF_DEFAULTS_PERSIST OPTIONAL.
ENDCLASS.
CLASS LCL_ZCRM_MKTDEF_PRD IMPLEMENTATION.
METHOD CONSTRUCTOR.
ME->CORE_OBJECT = CORE_OBJECT.
ENDMETHOD.
METHOD IOW_ZCRM_MKTDEF_PRD~HEADER_WITH_KEY_EXITS_IN_DBASE.
*" Declaration of Overwrite-method, do not insert any comments here please!
*"methods HEADER_WITH_KEY_EXITS_IN_DBASE
*" importing
*"    !IS_DEFAULTS_ATTR type CRMS_MKTDEF_DEFAULTS_DATA
*" returning
*"    value(EV_EXISTS) type CRMT_BOOLEAN
*" exceptions
*"    FAILURE .
ENDMETHOD.
ENDCLASS.

Note 1256889

Static factory methods, instead of constructor

Hi All,
why we use static factory methods, instead of constructor.
Apart from Singleton class , what is use of static factory methods ?
Thanks in Advance,
Rishi

One reason for using factories is that they simplify creating instances of immutable classes that might otherwise have messy constructors with lots of arguments.

Can an actionListener function be called inside a constructor?

Can an actionListener function be called inside a constructor??
class MainBean{
public MainBean(){
Can the linkDescription() function be called here?? Will there be any Parameters.??
public void linkDescription(ActionEvent e )
// actionListener Code
}

vishnuS1984 wrote:
@kevinaworkman : I am still struggling to assess how to :) what will be the syntax to call a function which takes in pameters like 'linkDescription (ActionEvent evt)'. I have not tried out yet...but can i call it by ' linkDescription() ' from inside my constructor.Its a basic java doubt as to how to call a function which accepts object of ActionEvent as parameters.I am still a begginer in Java who is trying to code in Spring:).Well, do you actually use the parameter in the method? This is completely legal:
public class NullTest {
    public NullTest() {
         doMyMethod(null);
    public void doMyMethod(String parameter){
         System.out.println("I don't care about my parameter!");
    public static void main(String[] args) {
        new NullTest();
}

Exposing only certain methods inside the PAPI WS WSDL

When we hit then Launch PAPI Web Services button inside of Studio , it creates a PAPI WS WSDL . This WSDL contains all methods which are then exposed to be used.
Can we customize this WSDL? Can we expose only certain methods inside this WSDL and then create a Web-Service Client?
Can we create our own methods or change names of methods inside this WSDL?
For e.g. I want to expose only the activityExecute method and create a web service client out of that. I want to hide all other methods.. Can I do that?
Can this be done before creating that WSDL?

if you are using 5.7 the url would be:
http://localhost:9595/workspace/webservices/ProcessService?WSDL
and if you change the axis configuration file in the workspace you could enable SOAP/JMS in PAPI-WS, but it is not officially supported, so you are on your own.
MAriano Benitez
AquaLogic BPM 5.7 SP1 is now available!

To call methods inside the same application is possible to use RMI ?

hello,
What I should like to know is if RMI can easily be used to implement comunication (calling methods) inside classes that are part of the one same application... This should be a restrict case to use RMI...
The reason to do it come from the need to use the instance of a class knonwing it only as Object... This can be good to do if some code is used for general pupose in many different contexts.
In this case you can pass to the "server class" a parameter 'o' of type Object (all the classes extend Object) of the "customer class" to get back informations if some elaboration happen inside the "server class"...
This purpose is generally implemented with event listeners, but perhaps it could be done easily using RMI too (I dont know it...).
Using RMI in this simple situation, don't should require anything of complicate (stub, .... mashalling parametres....) to have the reference to method of the "customer class" to call. The "server class" already recives a reference of the "customer class" how parameter of type Object, and the mame of the method too.
I propose a simple thoeric example to explain really what I said before:
Class Server {
    String methodName;
    Object obj;
    pubic Server( Oject o , String metName){ // constructor
        obj = o;
        methodName = metName;
        // some thing is done and, at last, the method callbakMethod() is executed
        callbakMethod();
    }// constructor
    public void callbakMethod(){ // this method have the purpose to call customerMethod()
          Class c = owner.getClass();
          Method m = null;
              try {
                      m = c.getMethod("callBackMethod",null);
                     * // (1)
                      // I think that here we could have the possibility to call
                      // the method customerMethod() belonging to class Customer..
                      // I don't know if it possible and ... (and if it is possible) I am not able to do it*
    }// callbakMethod()
} // class Server
Class Custmer{
    public Customer() { // constructor
          Server s = new Server (this, "customerMethod");
    } // constructor
    customerMethod() {    // I would this method is called from class Server
        // do some thing.....
    } //customerMethod
} // class CustomerMy ask is: it is possible to call customerMethod() from the Server class ?...
If the aswer is yes, I wold know the sintax to use to do it, please.
thank you
regards
tonyMrsangelo

RMI doesn't help you in the slightest here. You can just realize it all using local method invocation. All RMI does is to make that remote. If the objects aren't remote there is no point.

What is the purpose of Static methods inside a class?

Hi,
What is the purpose of Static methods inside a class?
I want the answers apart from "A static method does not require instance of class(to access) and it can directly be accessed by the class name itself"
My question is what is the exact purpose of a static method ?
Unlike attributes, a separate copy of instance attributes will be created for each instance of a class where as only one copy of static attributes will be created for all instances.
Will a separate copy of instance method be created for each instance of a class and only one copy of static methods be create?
Points will be rewarded for all helpful answers.

Hi Sharma,
Static methods is used to access statics attributes of a class. We use static attributes when we want to share the same attribute with all instances of a class, in this case if you chage this attribute through the instance A this change will change will be reflected in instance B, C........etc.
I think that your question is correct -> a separate copy of instance method will be created for each instance of a class and only one copy of static methods be create ?
"A static method does not require instance of class(to access) and it can directly be accessed by the class name itself"
Static Method: call method class=>method.
Instance Method: call method instance->method.
Take a look at this wiki pages.
[https://wiki.sdn.sap.com/wiki/x/o5k]
[https://wiki.sdn.sap.com/wiki/x/ZtM]
Best regards.
Marcelo Ramos

How would I call a method inside a dll?

How would I call a method inside a dll? Is it even possible in Java? Like in VB you would do something like this: XXX.dll --> XXX.Activate()... I have already loaded the dll like this:
String xxx = "C:/WINDOWS/system32/xxx.dll";
System.load(xxx);
Please help?
THX

I've got another question.
I've gone through the link you posted and a couple others that I found.
I am able to create an interface using the windows kernel32.dll and go through an example I found.
But when I try to use a dll that I have from another application, I have problems.
Here is what I have for the interface.
public interface IAiCamDeviceControl extends StdCallLibrary {
     public IAiCamDeviceControl INSTANCE=(IAiCamDeviceControl)Native.loadLibrary("D:\\IAiCamDeviceControl.dll",IAiCamDeviceControl.class);
//        public long GetVersion( String s );
//        public long Close();
}The interface that works looks like this:
public interface Kernel32 extends StdCallLibrary {
     public Kernel32 INSTANCE=(Kernel32)Native.loadLibrary("Kernel32",Kernel32.class);I thought that the problem might be using the path name for the library, so I copied it into the system32 directory.
Still get the same error:
Exception in thread "main" java.lang.UnsatisfiedLinkError: Unable to load library 'D:\IAiCamDeviceControl.dll': The specified module could not be found.
My main looks like
public class Main {
    public static void main(String[] args) {
//          Kernel32 lib=Kernel32.INSTANCE;
//          Kernel32.SYSTEM_POWER_STATUS batteryStatus=new Kernel32.SYSTEM_POWER_STATUS();
//          lib.GetSystemPowerStatus(batteryStatus);
//          System.out.println(batteryStatus);
            IAiCamDeviceControl camDev = IAiCamDeviceControl.INSTANCE;
}The commented part is from the version that worked.
All I attempted to do here was just create an instance of the interface.
Any idea why I can't access the dll?
The dll is the same one that is used successfully in VB, C#, and C++ demo programs, so I suspect it is a good dll.

Creating a method inside a constructor

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