Interface and Inheritence Differences

Hi, I'm new to java and have only a little experience with programming languages.
I can't seem to figure out what the differences and uses are for Inherited classes and interfaces.
I understand Interfaces set a list of methods and variables that must exist in implemented classes and that Super classes can define a default method.
What i want to understand is why I would use an interface rather than just extending a Super class.
Thanks.

oneplatformtorulethemall wrote:
What i want to understand is why I would use an interface rather than just extending a Super class.Two important reasons:
* completely unrelated classes (from different class hierarchies) can implement the same interface and need not have the same super class
* a class can implement more than one interface at once, while it can have only one super class
I might suggest that you don't care too much about that right now. Real understanding of the "why" can only come after you've used it for a while. Trying to understand the exact reasoning of this decision while you haven't used it a lot is probably pretty hard.

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The difference between IEEE802.1Q Native VLAN sub-interface and Physical interface?

Hello
I think the following topologies are supported for Cisco Routers
And the Physical interface also can be using as Native VLAN interface right?
Topology 1.
R1 Gi0.1 ------ IEEE802.1Q Tunneling L2SW ------ Gi0 R2
R1 - configuration
interface GigabitEthernet0.1
encapsulation dot1Q 1 native
ip address 10.0.0.1 255.255.255.0
Topology 2.
R1 Gi0 ------ IEEE802.1Q Tunneling L2SW ------ Gi0 R2
interface GigabitEthernet0
ip address 10.0.0.1 255.255.255.0
And is it ok to use the physical interface and sub-interface with dynamic routing such as EIGRP or OSPF etc?
R1 Gi 0 ---- Point to Multipoint EIGRP or OSPF ---- Gi0 R2 / R3
Gi 0.20--- Point to Point EIGRP or OSPF --- Gi0.10 R4 (same VLAN-ID)
R1 - configuration
interface GigabitEthernet0
ip address 10.0.0.1 255.255.255.0
interface GigabitEthernet8.20
encapsulation dot1Q 20
ip address 20.0.0.1 255.255.255.0
Any information is very appreciated. but if there is any CCO document please let me know.
Thank you very much and regards,
Masanobu Hiyoshi

Hello,
The diagram is helpful.
If I am getting you correctly, you have three routers interconnected by a switch, and you want them to operate in a hub-and-spoke fashion even though the switch is capable of allowing direct communication between any of these routers.
Your first scenario is concerned with all three routers being in the same VLAN, and by using neighbor commands, you force these routers to establish targeted EIGRP adjacencies R1-R2 and R1-R3, with R1 being the hub.
Your second scenario is concerned with creating one VLAN per spoke, having subinterfaces for each spoke VLAN created on R1 as the router, and putting each spoke just in its own VLAN.
Your scenarios are not really concerned with the concept of native VLAN or the way it is configured, to be honest. Whether you use a native VLAN in either of your scenarios, or whether you configure the native VLAN on a subinterface or on the physical interface makes no difference. There is simply no difference to using or not using a native VLAN in any of your scenarios, and there is no difference to the native VLAN configuration being placed on a physical interface or a subinterface. It's as plain as that. Both your scenarios will work.
My personal opinion, though, is that forcing routers on a broadcast multi-access segment such as Ethernet to operate in a hub-and-spoke fashion is somewhat artificial. Why would you want to do this? Both scenarios have drawbacks: in the first scenario, you need to add a neighbor statement for each spoke to the hub, limiting the scalability. In the second scenario, you waste VLANs and IP subnets if there are many spokes. The primary question is, though: why would you want an Ethernet segment to operate as a hub-and-spoke network? Sure, these things are done but they are motivated by specific needs so I would like to know if you have any.
Even if you needed your network to operate in a hub-and-spoke mode, there are more efficient means of achieving that: Cisco switches support so-called protected ports that are prevented from talking to each other. By configuring the switch ports to spokes as protected, you will prevent the spokes from seeing each other. You would not need, then, to configure static neighbors in EIGRP, or to waste VLANs for individual spokes. What you would need to do would be deactivating the split horizon on R1's interface, and using the ip next-hop-self eigrp command on R1 to tweak the next hop information to point to R1 so that the spokes do not attempt to route packets to each other directly but rather route them over R1.
I do not believe I have seen any special CCO documents regarding the use of physical interfaces or subinterfaces for native VLAN or for your scenarios.
Best regards,
Peter

Whats the difference between an INTERFACE and a CLASS?

Whats the difference between an INTERFACE and a CLASS?
Please help.
Thanx.

http://search.java.sun.com/search/java/index.jsp?col=javaforums&qp=%2Bforum%3A31&qt=Difference+between+interface+and+class

Difference between abstract interface and normal interface

Hello Friends,
What is the Difference between abstract interface and normal interface?....

What is the Difference between abstract interface and
normal interface?....The difference is that you didn't follow convention in the first case. All interfaces are implicitly abstract so you don't have to declare them as such.

Differences between Convensional interfaces and XI interfaces

Differences between Convensional interfaces and XI interfaces

hi,
wat do u mean my "Convensional interfaces"?
let me know.
kvr

Difference between interface and conversion

could you give me the difference between interface and conversion

hi
Conversion, converting legacy system data into SAP data. Meaning that it is mainly a one shot deal, for example bringing your customer master to SAP from the legacy system, converting the fields used in legacy to the fields and values used in SAP.
Interface, a program or group of programs that handle the passing of data from one system to another. These programs work together to export the data from one system and import into a target system, maybe these programs run once a day, maybe twice, may every hour throughout the day. It is a good way to keep the data in two or more systems in sync with each other.
Interface programs are also data extract program. Data is extracted from SAP into a flat file and transferred to other external systems like UNIX, mainframe.
In data extracts, the file layout is designed and this layout should be in synch with other external systems.
reward poins for useful ans
Regards
Aarti

What is the difference between Interface and Conversion?

Hi friends,
   Can any one teel me What is the difference between Interface and Conversion in detail.
Rewarded with points
Thanks & Regards,
Naren.

Hi,
   interface can be outbound i.e writing data to
   application server using open dataset,transfer
or downloading data (gui_download)
   inbound -> reading data from application server using
              open dataset,read dataset,uploading data
              using gui_upload.
   conversion:BAtch data communication method
              where legavy data is uploaded in SAp.
Regards
Amole

Interface and Abstract class difference

An interface can be used in such a way that we don't know the class of object assigned to a reference of that interface type until runtime. Can we use the abstract class in a similar way too?
The difference between an abstract class and interface can be listed as
1. Interface can not have implementation of any method
2. The usage of interface and class is one other difference
3. What other differences we have?

Yes an abstract class can be used in a similar way. The main issue with an abstract class is that you extend it and you can only extend one class so that can be a huge limitation that an interface does not give you.
Here's another one that is often overlooked: use both.
public abstract class SomeBaseClass implements Runnable {
public abstract void someAbstractMethod();
public void someMethodWithADefaultImplementation(){
System.out.println("Hello!");
}Any class that extends SomeBaseClass (and is not abstract) will need to implement the run() method of the Runnable interface.

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We are in the process of identifying interfaces for our current client. I am looking for some documentation or any specific information that will help me to differentiate between SAP PI interface and ABAP Interface. Basically I want to know what are the advantages of PI interface over ABAP interface. What is better? and why?
Any information would be of great help. Thanks.

PI (versus point to point ABAP) advantages are:
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2)     More effective (centralized) interface failure monitoring and resolution
3)     Elimination of redundant development and maintenance costs

Difference between interface and bdc

Hi All,
Can anybody please explain interface and BDC.
Thanks in advance

Hi
Interface is the one which is used to transfer data from SAP to Non SAP system or NON SAP to SAP system.
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Reward points if useful
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We have a weblogic time service that utilize a lot of
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ScheduledTriggerDef, TimeServicesDef etc. Although the time
service runs in the WLS 7, it is a big concern to me
that it uses so many deprecated interfaces or methods.
I am just wondering how I can replace them with non-deprecated ones

Mark,
I have a question about the API.
From the documentation and the API docs it is not clear how to schedule
a callback to be called just once ASAP.
We use the deprecated Timer service to execute long running operations
on the Weblogic thread pool and want the operation to execute only once
and start as soon as there is a thread available.
It is not clear what will happen in case a task is scheduled to be
executed only once and the time for that execution has passed ( 5 ms ago).
I'd appreciate the clarification.
Thanks,
Dejan
Mark Griffith wrote:
It will run because it is only deprecated. You should at some point
"rewrite", but the rewrite is not that big of a deal. There maybe some
slight differences in timers, since we moved to jmx interfacs, but the
scemantics should be very very close.
Attached is an example that will run in the 8.1 sample environment.
cd to $WLS_HOME
(On my box it is /bea/wls81/weblogic81/)
cd samples/domains/examples/
setExamplesEnv.sh
cd ../../server/examples/src/examples
../examples/src/examples 201$ pwd
C:/bea/wls81/weblogic81/samples/server/examples/src/examples
cp jmxTimerEar.zip .
jar xvf jmxTimerEar.zip
cd jmxTimerEar
ant
And it should build for you.
Cheers
mbg
"Eric Sundberg" <[email protected]> wrote in message
news:[email protected]..
We have a weblogic time service that utilize a lot of
deprecated interfaces and methods such as
ScheduledTriggerDef, TimeServicesDef etc. Although the time
service runs in the WLS 7, it is a big concern to me
that it uses so many deprecated interfaces or methods.
I am just wondering how I can replace them with non-deprecated ones

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Rahul

No one is better. Just write threadsafe code. E.g. do not declare instance variables which are to be used per request. Just keep in mind that only one instance of the Servlet will be created which lives as long as the webapplication runs and that it will be reused among all requests. Keep request scoped variables inside the method block and you're safe.

Abstract class Vs Interface and importance of using

Hi All,
I want to know what is the difference between Abstract class and Interface.
and what is the importance of using them.
Moderator message: please search for available information/documentation.
Edited by: Thomas Zloch on Sep 27, 2011 1:55 PM

Please refer to this thread, already this is discussed in forums
[ABAP Objects.. Abastract & Interface Class;
Thanks
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Thanks for your help.

There is a difference in the way the Web Interface that reads data and the Way Bex reads the Master data in the F4.
For Web reads the data directly from the Master Data tables...but in Bex especially the system generated Infoobjects get data from other system tables.

BADI and userexit differences

hi,
what is the difference between userexit and Badi.
how both are used?
kindly give me a solution.
with regards
thiru

Hi Thirunavukarasu Sundaramoorthy ,
USER-EXITS:
User Exit and Enhancement explained in detail .
http://sap.niraj.tripod.com/id21.html
Excellent web-site for user-exits
http://www.abaptalk.com/forum_posts.asp?TID=31&SID=3b18fa1dc8b7b9a1dbdedf36fe3bc2az&PID=56#56
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/208811b0-00b2-2910-c5ac-dd2c7c50c8e8
http://abap4.tripod.com/Other_Useful_Tips.html
User exits :
1. Introduction:
User exits (Function module exits) are exits developed by SAP. The exit is implementerd as a call to a functionmodule. The code for the function module is writeen by the developer. You are not writing the code directly in the function module, but in the include that is implemented in the function module.
The naming standard of function modules for functionmodule exits is:
EXIT_SAP Enhancements. Enter the exit name and press enter.
You will now come to a screen that shows the function module exits for the exit.
3. Using Project management of SAP Enhancements, we want to create a project to enahance trasnaction VA01 .
- Go to transaction CMOD
- Create a project called ZVA01
- Choose the Enhancement assign radio button and press the Change button
In the first column enter V45A0002 Predefine sold-to party in sales document.
Note that an enhancement can only be used in 1 project. If the enhancement is already in use, and error message will be displayed
Press Save
Press Components. You can now see that enhancement uses user exit EXIT_SAPMV45A_002. Double click on the exit.
Now the function module is displayed. Double click on include ZXVVAU04 in the function module
Insert the following code into the include: E_KUNNR = '2155'.
Activate the include program. Go back to CMOD and activate the project.
Goto transaction VA01 and craete a salesorder.
Note that Sold-to-party now automatically is "2155"
User exit - A user exit is a three character code that instructs the system to access a program during system processing.
SXX: S is for standard exits that are delivered by SAP.   XX represents the 2-digit exit number.
UXX: U is for user exits that are defined by the user. XX represents the 2-digit exit number
An example of a user exits :-
MODULE user_exit_0001 INPUT
    CASE okcode.
        WHEN 'BACK OR EXIT'.
            CASE sy-dynnr.
                    WHEN '100'.
                         SET SCREEN 0.
                         LEAVE SCREEN.
                    WHEN '200'.
Note that you can write any code that satisfy your needs.                                                     ****
But in this case, this was wrote as a sample code for reference sake.                                    ****
And you can test it.                                                                                ****
                         SET SCREEN 100.
                         LEAVE SCREEN.
             ENDCASE.
      ENDCASE.
Finding User Exits
Procdedure 1:
Valid up to at least SAP release 4.0B
One way to find user exits applicable for a given SAP screen. From the SE38 screen, enter the desired screen main program, and click Utilities > Find In Source Code, and "CUSTOMER-FUNCTION" as the text to search for. This will give you a list of the user exits and where they are called from for all screens in the module pool.
Note: format of ABAP statement is CALL CUSTOMER-FUNCTION '009', for example. This is the statement called by a submodule attached to the main program.
Actual related function is EXIT_SAPLCOIH_009, for example. This example refers to customer function 9 in main program SAPLCOIH. Not all user exit functions are names as such, but this is the usual format.
If you are doing data validation and want to set an error message with a field open, you must be sure that the user exit you are using is linked to a calling module in the PAI section of the screen and the field you wish to be open was in the CHAIN statement which caused the PAI module to be invoked.
If you use a customer function which was invoked by a PBO module to validate data, the "MESSAGE" statement will cause the screen to return with the desired message at the bottom, but with all screen fields closed for input.
When you make changes to the include module for a given customer function, you must regenerate the related function group before you will see the changes included in the screen behaviour.
Procdedure 2:
Need to find user exits module-wise? Suppose we want to see the available sales module user exits. Go to transaction SE81. Click on SD, then click "edit" on the menu bar and choose select subtree. Click on "information system," Open Environment node, customer exits, and enhancements. Press F8 to get all the user exits for that module. In brief: SE81->SD->Select subtree->Information System->Envir->Exit Techniques->Customers exits->enhancements->Execute(F8)
USER EXIT (SAP Enhancement)
http://www.planetsap.com/userexit_det_1.htm
List of all USER EXIT's (4.6c version)
http://www.planetsap.com/Userexit_List.htm
User Exits in FI/CO
http://www.ficoexpertonline.com/downloads/User%20ExitsWPedit.doc
Excellent web-site for user-exits
http://www.abaptalk.com/forum_posts.asp?TID=31&SID=3b18fa1dc8b7b9a1dbdedf36fe3bc2az&PID=56#56
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/208811b0-00b2-2910-c5ac-dd2c7c50c8e8
Enhancements,Creating a project,Assigning SAP enhancements to a project,Editing enhancement components,Activating a project
http://www.planetsap.com/userexit_main_page.htm
Find user exits with a TCode
http://www.erpgenie.com/abap/code/abap26.htm
SAP User Exits Routine
http://www.sap-basis-abap.com/sapab013.htm
ABAP Enhancement and Modifications(Enhancement Framework , Business Add-Ins ,Business Transaction Events)
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/109f5161-ee76-2910-cb99-db10b559ef4b
What is the difference between SMOD and CMOD?
http://www.sap-img.com/abap/what-is-the-difference-between-smod-and-cmod.htm
A Short Tutorial on User Exits
http://www.sap-img.com/abap/a-short-tutorial-on-user-exits.htm
BAdi:
Procedure 1:
1) Go to the transaction SE37 to find your function module.
2) Locate the function SXV_GET_CLIF_BY_NAME.
3) Put a breakpoint there.
4) Now open a new session.
5) Go to your transaction. 6) At that time, it will stop this function.
7) Double click on the function field EXIT_NAME.
8) That will give you name of the BADI that is provided in your transaction.
Business Add-Ins
Procedure 2:
1) Goto se24 (Display class cl_exithandler)
2) Double click on the method GET_INSTANCE.
3) Put a break point at Line no.25 (CASE sy-subrc).
4) Now Execute SAP standard transaction
5) Press the required button for which you need to write an exit logic, the execution will stop at the break point.
6) Check the values of variable 'exit_name', it will give you the BADI name called at that time.
7) This way you will find all the BADIs called on click of any button in any transaction
SAP Business Add-Ins (BAdIs) are one of the most important technologies used to adapt SAP software to specific requirements. BAdIs were introduced with Release 4.6 and replace function module exits. This technology is not limited to SAP applications. BAdI calls can be integrated in customer applications. These can then be enhanced by other customer applications. In the various SAP applications, BAdI calls are implemented at places where enhancements are appropriate.Business add-ins are enhancements to the standard version of the system. They can be inserted into the SAP System to accommodate user requirements too specific to be included in the standard delivery. Since specific industries often require special functions, SAP allows you to predefine these points in your software.
As with customer exits, two different views are available:
· In the definition view, an application programmer defines exit points in a source that allow specific industry sectors, partners, and customers to attach additional coding to standard SAP source code, without having to modify the original object.
· In the implementation view, the users of Business Add-Ins can customize the logic they need or use a standard solution, if one is available.
In contrast to customer exits, Business Add-Ins no longer assume a two-level infrastructure (SAP and customer solutions), but instead allow for a multi-level system landscape (SAP, country-specific versions, industry solutions, partner, customer, and so on). You can create definitions and implementations of Business Add-Ins at any level of the system landscape.SAP guarantees the upward compatibility of all Business Add-In interfaces. Release upgrades do not affect enhancement calls from within the standard software nor do they affect the validity of call interfaces. You do not have to register Business Add-Ins in SSCR.
The Business Add-In enhancement technique differentiates between enhancements that can only be implemented once and enhancements that can be used actively by any number of customers at the same time. In addition, Business Add-Ins can be defined according to filter values. This allows you to differentiate between Add-In implementations using the filter Country or other criteria.
The enhancement technique is set up in such a way that it is possible to define interfaces for ABAP soure code, screens, GUI interfaces, and tables. These allow customers to include their own enhancements in the standard. A single Business Add-In contains all of the interfaces necessary to implement a specific task.
BADI is just an object-oriented version of user-exit. Instead of entering program code into some function module (as in customer-exit), you define some class which has to implement predefined methods and those methods are fired at predefined points just like an old user-exit. Some BADI can have multiple independent implementations which is much better for software deployment as several developers can implement the same BADI independently. BADI/UserExists are used to enhance R/3 For customer Needs.
Actually there is no transaction to find when and where the BADI
is called.
1. You can see the BADI description to find why it is called.
2. Once you implemented and activated the BADI, put some break points
in the BADI and see "where else used" option to check in what all
programs this BADI is called. In the ITS debug, when you are doing
the operation what exactly the BADI description tells, it will take
to the break points and you have to do manually debug the whole thing.
I know its bit difficult to do manual debug the whole thing, it
takes lot of time, but you have to be very patience when you are
dealing with BADI's.
Transaction SE18 is the BADI equivalent of transaction SMOD
Transaction SE19 is the BADI equivalent of transaction CMOD .
To find the BADI to be implemented and then implement this via SE19.
Check this blogs 2 find a BADI:
How To Define a New BAdI Within the Enhancement Framework (Some Basics About the BAdI,BAdI Commands in ABAP,
When to Use a BAdI?)
/people/thomas.weiss/blog/2006/04/03/how-to-define-a-new-badi-within-the-enhancement-framework--part-3-of-the-series
How to implement a BAdI And How to Use a Filter
/people/thomas.weiss/blog/2006/04/18/how-to-implement-a-badi-and-how-to-use-a-filter--part-4-of-the-series-on-the-new-enhancement-framework
Introducing Business Add-Ins
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f3202186-0601-0010-6591-b832b1a0d0de
How to implement BAdi in Enhancement Framework
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/d0456c54-0901-0010-f0b3-cd765fb99702
Business Add-Ins
http://help.sap.com/saphelp_47x200/helpdata/en/ee/a1d548892b11d295d60000e82de14a/frameset.htm
BAdI: Customer-Defined Functions in the Formula Builder
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
Difference Between BADI and User Exits
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
To Use BADI - Business Add In you need to Understand ABAP OO Interface Concept
http://www.sap-img.com/abap/business-add-in-you-need-to-understand-abap-oo-interface-concept.htm
cheers!
gyanaraj
****Pls reward points if u find this helpful

Interface and Inheritence Differences

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