Regarding Interface methods implementation

Hi,
I have a interface with 3 methods.
public interface test{
public void A();
public void B();
public void C();
public class IntImpl implements test{
public void B(){
//implementation
Can we implement an interface with out implementing all the methods of interface .instead implementing a few methods in the interface?
i came to know that we can do the above one with out any exceptions? So any of you can resolve this issue ..
Thanks in advance
Sri

Can we implement an interface with out implementing
all the methods of interface .instead implementing a
few methods in the interface?In other words: can we implement an interface without implementing it?
The answer should be obvious.
i came to know that we can do the above one with out
any exceptions? Sure, it's quite easy, you already did it. The stuff above won't compile, hence it won't throw an exception when running.
Or you can also avoid compiler errors by declaring IntImpl as abstract. Which means you didn't implement the interface though.

Similar Messages

Interface method implementation

While Implementing a method gety() i am getting follwing error -
gety() in class B cannot implement gety() I ;attempting to assign weaker access privilees; was public
class B extends A implements I {
int i;
public B(int a,int b) {
int q = super.i;
System.out.println(q);
i = b;
void show() {
System.out.println(X);
System.out.println("i in subclass:" +i);
void gety() {
System.out.println("my");
interface I {
public static final int X=3;
abstract void gety();
}

If interface I says gety is public, then code that
uses an I expects it to have a public gety method.
Since B "is-a" I (by virtue of the fact that it
implements I), it has to do everything I promisesto
do.Nice class names... it makes it sound like you just
have really bad grammar :)Just following what the OP had. But yeah, I noticed that as I was typing, but couldn't be bothered to change it.

Interface method not implemented by class :(

I'm getting an error for interface method
Interface method handleLogout in namespace views.interfaces:IWiseMediator not implemented by class views.mediators:RatingViewMediator.    RatingViewMediator.as
package views.interfaces
    import flash.events.Event;
    public interface IWiseMediator
        function handleLogout(event:Event):void;
but I done this in RatingViewMediator
private function handleLogout(event:Event):void
            viewObject.clearFields();

interfaces are used to enforce a public 'interface' to the class. as a private method can only be accessed by the class itself, it doesn't make sense to include private methods in an interface.

Regarding interface in the ABAP-HR

Hi Experts,
 Iam new to ABAP-HR,
 I have 2 custom table which are updated with OT records from one batch program.
 Now i have to generate two files for regular OT data file and Off-Cycle OT data file respectually.
What i have to do?For this i have to pick the data from those two custom tables and create the files by using open dataset statement,Is this right way in HR?
Actually the selection screen is having Payroll area,Current period and Other period fields.
and the table is having BEGDA,ENDDA in one table and OTdate in onother table.How can i compare the dates?

Hi,
Interface Can be declared globally or locally within a program.
Locally declared in the global portion of a program using:-
INTERFACE <intf>.
ENDINTERFACE.
The definition contains the declaration for all components (attributes, methods, events) of the interface.
Interfaces are included in the public section of a class.
Interfaces do not have an implementation part, since their methods are implemented in the class that implements the interface.
Interfaces do not have instances.
A component <icomp> of an interface <intf> can be addressed as though it were a member of the class under the name <intf~icomp>.
Addressing Objects Using the class reference variable <cref>:
To access an attribute <attr>: <cref>-><intf~attr>
To call a method <meth>:
CALL METHOD <cref>-><intf~meth>
Using the interface reference variable <iref>:
To access an attribute <attr>: < iref>-><attr>
To call a method <meth>:
CALL METHOD <iref>-><meth>
Addressing a constant <const>:
<intf>=><const> (Cannot use class name).
Addressing a static attribute <attr>:
< class>=><intf~attr>
Calling a static method <meth>:
CALL METHOD <class>=><intf~meth>
 (Cannot use Interface method ).
casting operator (?= )
<cref> ?= <iref>
 For the casting to be successful, the object to which <iref> points must be an object of the same class as the type of the class variable <cref>.
sample program
report ysubdel .
interface i1.
data : num type i .
methods : meth1.
endinterface.
class c1 definition.
public section.
methods : meth1.
interfaces : i1.
endclass.
class c1 implementation.
method : meth1.
 write:/5 'I am meth1 in c1'.
endmethod.
method i1~meth1.
 write:/5 'I am meth1 from i1'.
endmethod.
endclass.
start-of-selection.
data : oref type ref to c1. create object oref.
write:/5 oref->i1~num.
call method oref->meth1.
call method oref->i1~meth1.
Regards,
Sowjanya.

Query regarding interface

Hi All,
I have one interface with method XYZ... i am implementing that method with the help of classes ZCL and ZCL1 ...suppose when i am implemetig interface with class ZCL then its output is 123 and with class ZCL1 output is 456 ...when i call the instance of that interface in report with the help of class method get_instance of class cl_exithandler and run the report i am getting output as 123456.... i want to know how both the instances of both classes are called when we call one interface?
Thanks..

you are right, i am calling the method of particular class as you described but i am calling interface method as below :
data exit_sub type ref to ZIF_EX_S_BADI_ADV.
call method cl_exithandler=>get_instance
changing instance = exit_sub.
CALL METHOD exit_sub->getpernr
EXPORTING zpernr = itab-pernr.
the method of this interface is implemeted by two classes ...so when i call interface like this i get combined output of both the implementations ...so you mean to say that when i call any interface like this all its implementations get called for BAdI ??...if your answer is yes then its ok ...i have one more question regarding the same
If we are not using BAdI and just implementing interface in our report then in that case also all the implementations of the interfaces will get called ??

Accessing an app.module's client interface methods in other app module

Hi all,
We are developing an application with number of projects (one for each module). We have got a common project with an application module, entity and view objects which are common for the entire application. For reusability, this common project is shared in session scope since most of them are of static nature.
In the shared application module's implementation class, a common method has been included that will be used for data filtering by constructing/appending where clauses in a particular application scoped view object. This method has been exposed as client interface method so that other projects can make use of it. The common project is compiled as an ADF Library jar for accessing it in other projects.
For accessing the exposed client interface method, from the view controller layer, we can include its reference in the page definition file and can execute the method from a managed bean by finding the operation binding from the page definition. But, in case if we wish to access the method in another model project, we could not do so.
Now, my questions are:
1. Is it the correct location(Shared App Mod. Impl) for including the logic to filter the data?
2. Is it possible to access the app. module impl method in another project's impl classes (Let it be entityImpl or viewObjectImpl or viewRowImpl or AppModImpl) ?
3. If it is possible, how it has to be done?
Thanks and regards,

Strange, the same question here {thread:id=2187487}
Timo
Edited by: Timo Hahn on 08.03.2011 12:02
@john You beat me agian

Redefine Interface Method

Hi, I am using a BI Interface "IF_RSCNV_EXIT" and I am adding code to the "Exit" Method.
Do I need to redefine this method? The reason I ask is because the redefine icon is greyed out even though I am in edit mode.
Thanks!

Hello Kenneth
Interface methods are always empty. You can implement them only once within a hierarchy of classes using this interface. Thus, you cannot redefine it.
Regards
Uwe

Regarding interfaces?

Mapping data for interfaces between SAP and Non-SAP systems?
What are the things involved in it
Please explain me and if you have any documents regarding pls let me know
pls forward the doc if any to [email protected]

satishnarayan wrote:
HI
I have doubt regarding interface concept.That is in my interface 7 methods are already available.that interface was implementd by 3 classes.like class a,class b,class c.in future i will add some extra method to that interface but that method will usefull only in class a
but it will not usefull in class b, class c. how can i achieve this type of scenario.plese give the answer.
Thanks and regardsAccording to your example the additional methods should NOT be added to the interface. An interface should only include the methods relevant to all of the classes implementing it. Any method not related to theinterface itself should not be in there.
Add your methods to class a or create a second interface declaring the methods you need.

Calling an interface METHOD of another abap web dynpro application

Hi Experts,
Can u plz tell how we can Call an interface METHOD of another abap web dynpro application in main WD Component.
Thanks
Mahesh

Hi ,,
   Example ALV interface method calling   GET_MODEL interface method
   View attribute   declaration   :    M_WD_ALV type      IWCI_SALV_WD_TABLE
     DATA lo_INTERFACECONTROLLER TYPE REF TO IWCI_SALV_WD_TABLE .
      wd_this->M_WD_ALV =   wd_this->wd_cpifc_alv( ).   "ALV is the usage name
     DATA lv_value TYPE ref to cl_salv_wd_config_table.
      lv_value = wd_this->M_WD_ALV->get_model( ).   " interface method calling in ALV component usage.....
Regards,
Devi

Access specifiers for interface methods

When we implement the interface ,we have to specify the implementing method access specifier to be "PUBLIC" ,but not "PROTECTED" or "PRIVATE".
Compiler is giving an error -- attempting to assign weaker access privileges ,when we specify protected.
what is the internal reason for this?Why we shouldnt make the access weaker in the implementing class.
Can any one help me on this.Your help is highly appreciated.

When we implement the interface ,we have to specify
the implementing method access specifier to be
"PUBLIC" ,but not "PROTECTED" or "PRIVATE".
Compiler is giving an error -- attempting to assign
weaker access privileges ,when we specify protected.
what is the internal reason for this?There is absolutely no point in having a private interface method. The interface represents a visible abstraction and private methods are never visible so it is a contradiction in terms.
An interface is intended to represent an abstraction that a user (software) uses. Protected via child/parent represents a usage that is restricted to a child from a parent. The child can already see the parent so there is no point in having an abstraction for the child. And it would probably be unwise to limit a child by such an abstraction.
Protected via the package and interfaces is more contentious as to why it is not allowed. There are those that argue that this should be allowed so that a package can use interfaces but restrict them to the package. To me this seems like a minor point given that most interfaces will probably represent an abstraction to other packages and not within a single package. This applies specifically to default access as well.

Question when i am in web dynpro interface method trying to find code

Hello guys,
I am in an event handler and i see this logic wd_this->mo_dodm_srchbidder_c->add_selected_bidder(). When i double click on the add selected bidder it takes me to the method inside interface /sapsrm/IF_CLL_DODM_BIDDER. So when i double click on the method it takes me nowhere.
My question is what do i have to do or where do i go to see the code for add_selected_bidder? thank you.

I think, you have visited to the definition of the interface method and not the implementation of the method.
You have instantiated the wd_this->mo_dodm_srchbidder_c some where, may be in the wd domodifyview. Find that out where the implementation happens.
I believe when you double click the method in editor ask for to go to definition or implementation.

Interface method in enhancement mode

Hello Experts,
I need to enhance a standard web dynpro component. I have created a new method in the component controller using enhancement implementation. This method has to be called from another component. Therefore I need to make this as an interface method. But in enhancement mode I do not see an option to make this method as an interface mathod. Kindly let me know if this is poosible.
Thanks,
Pooja

Hi Pooja,
Please check this threads.. Hope you understand.
Add an interface Method/Event via enhancement??
How to make Interface node in an Enhancement Implementation
Cheers,
Kris.

Add an interface Method/Event via enhancement??

Hi expert.
I want to pass additional data between two standard webdynpro components. As for as I know, I can use infterface method/event in custom webdynpro component and click check box 'Interface' of method/event.
However I can add new method/event in standard webdynpro via enhancement, the check box 'Interface' is dispear.
So is it possibe to add an interface method/event via enhancement? or pass additional data between standard webdynpro component?

Hi,
First you need to understood the standard webdynpro component which you are looking for.
If the standard component is providing interface methods/events then you can call from your custom webdynpro component re-using the standard component in your custom component.
If you provide mroe information about which standard component and which event/method you are looking for, so that I will provide more info.
Best of luck..
Regards,
Naresh

Why are interface methods public?

I want to define a package interface that will be implemented only by package classes which will be used only by other package classes. Why do the methods have to be public?

In java you don't have multiple inheritance. To
circumvent that it is said to extend the most
important class and implement the others with
interfaces. No. Java does not support multiple inheritance. Interfaces do not exist to supply that functionality. Interfaces can be used to simulate some of the patterns that multiple inheritence represents.
(You can have skeleton implementations to
help you implement those interfaces in other
classes).
But the interface methods are public. So all the
classes you 'extend' via this trick have all methods
public.
This is a bad thing. All of you who have used RMI (or
J2EE) know that you can serialize objects between two
networked machines. ValueObjects pattern from J2EE
toolbox is a good example of this. Now, if you happen
to have several quite similar objects, you obviously
would like them to inherit those common traits from
some base class. If you would also like them to have
some other common functionality (for example server
side 'maintenance' methods, state monitoring, checking
and clearing, you would have to make those methods
public 'cos you only have interface implementation
left - after spending that single credit to actual
inheritance.No. Convienence ("common functionality") should not be used in most cases when designing hierarchies. Inheritence should only be used to represent 'is a' relationships.

Create interface method in standard component.

Hi Experts,i want to enhance standard component.in that i created one attribute and i used in my component.For that attribute the value is passing from some other component.i try to create interface method in standard component.but it is not possible.so please help me out this issue.
Regards
prasad

Hi,
No, You cannot create Interface Methods/Nodes in Standard Component by Enhancing. I would suggest to create a Singleton class and create your method in that class and can access across components.
Regards,
Kiran

Regarding Interface methods implementation

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