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.

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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.

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.

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.

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

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.

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.

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

Best practice for Javadoc comments in both an interface and implementation

For the Spring project I'm writing, I have interfaces with typically 1 implementation class associated with it. This is for various good reasons. So I'm trying to be very thorough with my Javadoc comments, but I realize I'm basically copying them over from interface to implementation class. Shouldn't Javadoc have a setting or be smart enough to grab the comments from my interface if the implementation class doesn't have a comment? Unless of course there is interesting information about the implementation, it's rare the 2 sets of comments would be different.

Thanks Thomas!! Exactly what I was looking for. Here's the JavaSE 6 version of the page you provided:
http://java.sun.com/javase/6/docs/technotes/tools/windows/javadoc.html#inheritingcomments

Interface Method

Hi experts,
I have the following scenario:
Component A opens, in a modal window, the component B.
When I do something in B, it's closed and I return to A.
There, I need read data from B (which is closed at the moment), to do something in A.
Anybody knows how can I do it?
I tried with external context mapping, but It doesn't work...
Could it be done with interface methods?
Thanks in advance!
Lucas

Hi Padmam,
Thank you for your reply too, but I'm having problems with your solution.
I have created an interface Node in Component A, and I have created the mapping in the component usages of the component B.
When I run component A, it gives me an error. I supose that it is rise by this Interface Node.
This error is solved when I check out the property "Input Element (Ext)" of Interface Node, but without this property, I can't do the External Mapping...
Could you correct me if I'm wrong?
Thanks in advance!
Lucas

Accessing Sender parameter attribute in event hander method implementation

Hello knowledgeable friends.
I would like a single event handler to manage two alv grid objects. There is a parameter SENDER that is available in the method implementations to say which object triggered the event. I would like to get at the attribute MT_OUTTAB but this syntax does not work:
local_variable = sender->mt_outtab
Any help would be greatly appreciated

Ok, MT_OUTTAB is a protected Attribute. I would settle for just the name of the Sender. This code checks:
    call method sender->get_name RECEIVING name = l_name.
but l_name is empty. I was hoping for 'GRID1'; when I created the object I used:
    CREATE OBJECT alvgrid
      EXPORTING
        i_parent = container_top
        i_name = 'GRID1'.

Overriding Interface methods via JNI

Hello,
How we can override Interface methods via JNI?
For example:
At HelloWorldSwing example:
http://download.oracle.com/javase/tutorial/uiswing/examples/start/HelloWorldSwingProject/src/start/HelloWorldSwing.java
I've written anonymous Interface as:
import javax.swing.*;
public class HelloWorldSwing1 {
     * Create the GUI and show it. For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    static Runnable runnableObject = new Runnable() {
         public void run() {
              createAndShowGUI();
   public static void main(String[] args) {
         //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(runnableObject);
}via JNI functions(http://download.oracle.com/javase/1.4.2/docs/guide/jni/spec/functions.html) we cannot override Runnable Interface's run method? Can we?
Only:
RunnableClass's value isn't null with given example at below. FindClass finds the Runnable Interface.
jclass RunnableClass;
RunnableClass = (*env)->FindClass(env,"java/lang/Runnable");
if( RunnableClass == NULL ) {
    printf("can't find class Runnable\n");
    exit (-1);
}But How can we override Runnable class's run method?
Thanks in Advance

The only way you can override a method in Java is by defining a class that does so, either statically or as an anonymous inner class. You can't do either of those things in JNI. Ergo you cannot do what you are asking about.

Creating shared library of native method implementation using gcc

Hi
I am using Dev-C++ IDE for writing and compiling C Programs. It supports gcc.
I have to build a shared library of a native method implementation using gcc compiler.
In JNI tutorial build script is given for VC++ which is as follows
cl -Ic:\java\include -Ic:\java\include\win32
-LD HelloWorldImp.c -Fehello.dll
Similarly I wanted build script for gcc compiler.
Thanks
Shailesh

Here is an example of building a library from one module with CygWin's gcc:
# Must set JAVA_HOME and LIBRARY_MODULE before
gcc -mno-cygwin -D__int64="long long" -I $JAVA_HOME/include/win32 -I $JAVA_HOME/include -shared -Wl,--kill-at -o $LIBRARY_MODULE.dll $LIBRARY_MODULE.c

Interface method implementation

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