Whats the use of interface

I know interface is use for multiple inheritence but is there anyohter reason instead of this?

Hi,
The power that interface gives you is not in the implementation but in the design. One should always have a blueprint specially when you are trying to make code reusable. If the blueprint is right then you can keep the signatures clean and separate from the implementation. The interfaces publish how a class or a set of classes would behave and hence declares the functionality rather than stressing on the implementation.
So you can treat interfaces as a contract that the classes that implement teh interface are bound to provide. So you get hold of interfaces you know what all you can do when you call methods which implement them. Interfaces are mostly shared when you would like to integrate components and for that matter even putting together some bigger functionality from small set of classes.
Interfaces also define some common set of behaviour that the classes that implement the interface are bound to provide. It captures the similarities across unrelated classes without forcing a class relationship
Hope this helps
Aviroop

Similar Messages

What is the use of interface in the adobe forms

Hi friends,
can any one tell,
what is the use of interface in the adobe forms for desigining the form.

The main purpose of the form interface is to send the application data to the form.
The form interface is created separately from the form, which consists of the form context and layout. When you create a form, you must assign it to a form interface.
please have a look at the link below for more info:
http://help.sap.com/saphelp_nw70/helpdata/EN/96/6ee0d5b39640d68fc0078fc575114a/frameset.htm
http://help.sap.com/saphelp_nw70/helpdata/EN/f2/21021b911f4c0cae11459a4ce0bc62/frameset.htm
hope this helps,
harman

Why interface property be default final whats the use of that

can anybody explain me
when i declared a variable inside the interface its always public static final.
why its static and final what the use of theat. its set of rule or it has any reason.

Sir,
You do not have much choice:
From the JLS (9.3):
"Every field declaration in the body of an interface is implicitly public, static, and final. It is permitted to redundantly specify any or all of these modifiers for such fields."
Note from this though that you do not have to explicitly declare a field in an interface as public / static / final if you dont want to - if you leave it out the field is implicitly declared with these attributes.
So you could wite:
public interface SirInterface {
public int HeIsActuallyPublicStaticFinal = 1;
}

Whats the best audio interface to use w/new Imac?

Hey now! I;ve just bought a brand new Imac 20"
and I'm wondering whats the best Audio interface to use w/ garageband? Also firewire or USB. I want record guitar,bass, vocals, etc.. thanks!

You may want to ask this question in the GarageBand forums.
USB is cheaper but Firewire is generally better.
PreSonus is a good brand and I think they are class compliant, so no driver needed - plug and play.
M-Audio is another popular brand. Sometimes may have driver issues, though.
But a lot depends on your budget and what your needs are. How many input will you need, etc?
If just for solo recording then the PreSonus Inspire would be good. For a full band their FP10 (Firebox) is great.
Check out this site to get you started (lots of great GB info too):
http://www.bulletsandbones.com/GB/Interfaces.html
Also check Sweetwater, MusiciansFriend for interfaces.

The use of interface in abap object

hi,
what is the use of interface in class? can have a simple example with explanation? i have read from help but not quite understand its purpose.
thanks

Hi El,
Interfaces are pure abstract classes. The interface methods will have only definitions but no implementations.
The classes which will implement interfaces has to provide the implementation to the methods.
Interfaces will provide the common definition and the classes which implements these interfaces will provide them different implementation to the methods as per their requirements. This achieves Polymorphism of Object Orientation.
REPORT zbc404_hf_events_3 .
INTERFACE lif_employee.
METHODS:
    add_employee
       IMPORTING im_no   TYPE i
                 im_name TYPE string
                 im_wage TYPE i.
ENDINTERFACE.
CLASS lcl_company_employees DEFINITION.
PUBLIC SECTION.
    INTERFACES lif_employee.
    TYPES:
      BEGIN OF t_employee,
        no TYPE i,
        name TYPE string,
        wage TYPE i,
     END OF t_employee.
    METHODS:
      constructor,
     add_employee      "Removed
        IMPORTING im_no   TYPE i
                  im_name TYPE string
                  im_wage TYPE i,
      display_employee_list,
      display_no_of_employees.
PRIVATE SECTION.
    CLASS-DATA: i_employee_list TYPE TABLE OF t_employee,
                no_of_employees TYPE i.
ENDCLASS.
CLASS lcl_company_employees IMPLEMENTATION.
METHOD constructor.
    no_of_employees = no_of_employees + 1.
ENDMETHOD.
METHOD lif_employee~add_employee.
Adds a new employee to the list of employees
    DATA: l_employee TYPE t_employee.
    l_employee-no = im_no.
    l_employee-name = im_name.
    l_employee-wage = im_wage.
    APPEND l_employee TO i_employee_list.
ENDMETHOD.
METHOD display_employee_list.
Displays all employees and there wage
    DATA: l_employee TYPE t_employee.
    WRITE: / 'List of Employees'.
    LOOP AT i_employee_list INTO l_employee.
      WRITE: / l_employee-no, l_employee-name, l_employee-wage.
    ENDLOOP.
ENDMETHOD.
METHOD display_no_of_employees.
Displays total number of employees
    SKIP 3.
    WRITE: / 'Total number of employees:', no_of_employees.
ENDMETHOD.
ENDCLASS.
Check this link for some more examples on OO ABAP
http://www.erpgenie.com/sap/abap/OO/eg1.htm
Thanks,
Vinay

HOw to create a Batch file for java application and whats the use of this ?

HI,
How to create a Batch file for java application ?
And whats the use of creating batch file ?
Thanks in advance

First of all, you're OT.
Second, you can find this everywhere in the net.
If you got a manifest declaring main class (an classpath if needed), just create a file named whatever.bat, within same directory of jar file, containing:
javaw -jar ./WhateverTheNameOfYourJarIs.jar %*By the way, assuming a Windows OS, you can just double click the jar file (no batch is needed).
Otherwise use:
javaw -cp listOfJarsAndDirectoriesSeparedBySemiColon country/company/application/package/className %*Where 'country/company/application/package/' just stands for a package path using '/' as separator instead of '.'
Don't specify the .class extension.
Javaw only works on Windows (you asked for batch, I assumed .BAT, no .sh), in Linux please use java.exe (path may be needed, Windows doesn't need it 'cause java's executables are copied to system32 folder in order to be always available, see PATH environment variable if you don't know what I'm talking about) and use ':' as classpath (cp) separator.
The '%***' tail is there in order to pass all parameters, it only works on Windows, refer to your shell docs for other OSs (something like $* may work).
This way you have a command you can call to launch your code (instead of opening NetBeans just to see your app working). You could schedule tasks on it or just call it in any command prompt (hope you know what it is 'cause there have been people in this very same forum with no clue about it, if not just hold the 'Windows button' and press 'R', then type 'cmd' and run it).
Finally add dukes and give 'hem away.
Bye.

Whats the use of 'Maximum Councurrency' in File Receiver adapter?

Hi All,
Whats the use of 'Maximum Councurrency' in File Receiver adapter?
Xier

Hello,
Refer the below thread and check it out my reply . I gave for JDBC adapter, but the concept is same for File/JDBC.
Re: JDBC Adapter - One Connection prior to SP20
Best regards,
raj.

Whats is table type ? whats the use of it in abap?

hi,
i am ahmed abap fresher,
i want to know what is table type and whats the use of it. at what point/situation we utilize this table type.

Hi Ahmed ,
Table is apart of data dictionary.
Table is a sort of container where we store data.
For eg. you want to store customer record in the database.Now you will store that customer record against specific fields of the applicable table.
You can create or see table by means of transaction code se11.
There are 3 typesof tables available in SAP ABAP:
1. Transparent table
2. Pool table
3. Cluster table.
Transparent Table:
A physical table definition in the database for the table definition which is stored in the ABAP Dictionary for transparent tables when the
table is activated. The table definition is translated from the ABAP
Dictionary to a definition of the particular database.
Pooled table:
Pooled tables can be used to store control data (e.g. screen sequences,
program parameters or temporary data). Several pooled tables can be
combined to form a table pool. The table pool corresponds to a physical
table on the database in which all the records of the allocated pooled
tables are stored.
Cluster table:
Cluster tables contain continuous text, for example, documentation.
Several cluster tables can be combined to form a table cluster. Several
logical lines of different tables are combined to form a physical record
in this table type. This permits object-by-object storage or
object-by-object access. In order to combine tables in clusters, at
least parts of the keys must agree. Several cluster tables are stored in
one corresponding table on the database.
See the documetation at:
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21f083446011d189700000e8322d00/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/81/415d363640933fe10000009b38f839/frameset.htm
Reward if useful ...
Regards ,
Shankar GJ

How java support multiple inheritance by the use of interface.

As per my understanding, Interface is just having the signatures of the methods not the implementation.
So How java support multiple inheritance by the use of interface?
Answer 1: we can institate interface reference by its implemented
class.
          �� interface inf...
          �� class aa implements inf..
          �� class bb implements inf....
           Now, inf i = new aa();
           inf i = new bb();
Answer 2: We can extends as many interface as we want in the
single
           interface.
           i.e. interface infFirst....
           interface infSecond....
           interface infThird....
           Now ,
           interface ingMulti extends infFrist, infThird...
By above two answers its not prity clear as per the multiple inheritance in C or C++.
           i.e.
           class first{
           method abc();....}
           class second{
           method bbc()......}
           class multi::first::second{
           we can call to abc();.....as well as bbc();
-Please give your important suggstion on the same.(Hope I explain it well.)
-Jeff

The keyword implement is used only for interfaces not
for abstract class. If i am wrong correct me.I believe your right, but I will double check.
As for the multiple inheritence think about the following code:
class Animal {
    // Animal generic stuff in this class
interface Eat {
    // Generic stuff that models eating behavior
interface Runs {
    // generic methods that model running behavior
public class Horse extends Animal implements Eat, Runs {
    // Stuff specific to a horse
}The Animal class is generic but has stuff in it common to all animals.
The Eat interface models behavior that is generic to eating, all living things have to eat something to survive. Herbavore are different from carnivores.
The Runs interface models generic behavior to running, such as speed. A cheeta definately runs faster than a human.
This brings us to the Horse class. It extends the Animal class because it "is-a" animal, and it implements the eat and runs interface because they are behaviors a horse has.
I hope that helps.
Extending an abstract class is the same as extending a regular class with the exception you MUST override all abstract methods in the abstract class. Thats not too difficult but I believe when designing classes, designing an abstract can be more diffecult than modeling the base class, and generic behaviors in interfaces. JMO.
JJ

WHATS THE USE OF TABLE STRIP CONTROL AND TABLE VIEW CONTROL

WHATS THE USE OF TABLE STRIP CONTROL AND TABLE VIEW CONTROL

Subhash,
You create and distribute a model in BD64. The details of that are stored in this tables.
A model gives you the details of the sender / receiving systems and what are the message types that are getting transferred between these systems.
Regarding the IDOC segments issue, can you explaing how are you triggering the IDOC and which message / idoc type you are dealing with.
Regards,
Ravi
Note :Please mark the helpful answers
Message was edited by: Ravikumar Allampallam

Whats the use of sap queries

whats the use of sap queries

Hi,
http://www.sap-img.com/abap/what-is-sap-queries.htm
http://www.informit.com/articles/article.asp?p=664660&rl=1
def sap query
http://help.sap.com/saphelp_bw21c/helpdata/en/f1/0a5625e09411d2acb90000e829fbfe/content.htm
In HR
You can use SAP Query in HR to report on HR data.
how to create sap query
http://help.sap.com/saphelp_46c/helpdata/EN/d2/cb4145455611d189710000e8322d00/content.htm
for maintain SAP query in HR
http://help.sap.com/saphelp_46c/helpdata/EN/d2/cb42cb455611d189710000e8322d00/content.htm
http://help.sap.com/saphelp_46c/helpdata/EN/d2/cb455f455611d189710000e8322d00/content.htm
If you want to create InfoSets for HR, you can use logical databases PNP, PAP, and PCH . The database you must use to create your InfoSet depends on the component in which the data you want to report on is stored.
Creating InfoSets
The maintenance procedure for HR InfoSets differs from the procedure described so far in this section inasmuch as HR data fields are grouped together in infotypes. To set up an InfoSet for the HR application, proceed as follows:
   1. On the initial screen for maintaining InfoSets, enter a name for the InfoSet and choose Create.
   2. On the next screen, enter a name for the InfoSet and select one of the HR logical databases in accordance with your reporting requirements.
Customer infotypes can be created on all HR logical databases. In each individual case, therefore, you must decide which database to select so that you can report on customer infotypes.
This screen enables you to enter an authorization group. All of the queries that are subsequently created using this InfoSet can only be executed by persons who have this authorization group.
   3. Choose .
This takes you to the Infotype Selection for InfoSet screen. You now have the option of creating field groups and assigning fields as required for non-HR InfoSets. Field groups that correspond to infotypes and already contain fields, however, are always created for HR InfoSets. The field groups are displayed in an overview tree in the top right section of the screen.
The infotypes that you included in the InfoSet are displayed in an overview tree on the left of the screen. The infotype fields that are already included in field groups are displayed in a different color, and the field group ID is displayed.
In the standard system, a field group is created automatically for each infotype that you included in the InfoSet (a field group corresponds to an infotype).
In the standard system, each field group contains the infotype-specific fields. To ensure that working with the InfoSet is as easy as possible, you are advised to restrict your use of fields in each field group to those you really require. This means you should remove fields that are not required.
An infotype's fields must only be assigned to the pertinent field group. Make sure this assignment is correct. If the assignment is incorrect, the InfoSet could be rendered unusable.
When an InfoSet is created, the following fields are transferred automatically to the first field group:
Logical database PNP Personnel number
Logical database PAP Applicant number
Logical database PCH Object ID, plan version, and object type
   6. Determine the fields that must be included in the field groups of your InfoSet. If you require further information, see
      Assigning Fields to a Field Group.
If you want, you can change the default sequence of field groups and fields as required using drag & drop.
   7. To save the InfoSet, choose .
   8. To generate the InfoSet, choose .
      On the Change InfoSet (InfoSet name) screen, you can choose Edit ® Change infotype selection to add more infotypes to the InfoSet, or to remove infotypes from the InfoSet. Remember to regenerate the InfoSet afterwards.
      This screen also enables you to update InfoSets if, for example, the system contains new additional fields for specific key values. To do so, choose InfoSet ® Additional functions ® Update additional HR fields.
   9. Go back to the initial screen for InfoSet maintenance.
10. Choose User group assignment.
11. Select a user group, and save your entry.
Please reward points.

Whats the use of assigning price list to site

hi ,
Why we assign price list in site (wb01) merchandise category?is that price list the same which i assign in "assign pricing type/reference site to organisational levels" in sales price calculation.explain me whats the use of assigniing the price list in siter(wb01) merchandise category which we will find on the top screen inside the site master
regards
krish

Hi Krish
Price list are assigned to article through MC at site master, no where else we define price list with article. When you run WPMA to transfer article price to stores, system will look at assigned price list with MC at site master then transfer the price.
Price list assign at organisational level will help system to find which pricing procedure to be used and which store Net purchase price to be taken for calculation.
Best Regards
Swami

Whats the use of TC we16

Hi all
whats the use of TC we16 ?
K S GREWAL

Grewal,
This is the inbound testing tool for IDoc files. Enter the path and file name for the IDoc file and the File Port set up to bring it in. Make sure it matches the File Port used in the Partner Profile for your Partner and IDoc Message Type.
So I would recommend to run only in DEV.
---Satish

Whats the use of doget and dopost

hi
whats the use of doget and dopoast when same work can be done by sevice alone?
Message was edited by:
pooja_k_online

Try looking at the Tomcat implementation of HttpServlet.service() method. I have pasted it below, if you look at the service() method all it does is to check for the method and call the appropriate method. It is not recommended to override the service method. It is a good practice to only override the getXXX() methods.
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
String method = req.getMethod();
if(method.equals("GET"))
long lastModified = getLastModified(req);
if(lastModified == -1L)
doGet(req, resp);
} else
long ifModifiedSince = req.getDateHeader("If-Modified-Since");
if(ifModifiedSince < (lastModified / 1000L) * 1000L)
maybeSetLastModified(resp, lastModified);
doGet(req, resp);
} else
resp.setStatus(304);
} else
if(method.equals("HEAD"))
long lastModified = getLastModified(req);
maybeSetLastModified(resp, lastModified);
doHead(req, resp);
} else
if(method.equals("POST"))
doPost(req, resp);
else
if(method.equals("PUT"))
doPut(req, resp);
else
if(method.equals("DELETE"))
doDelete(req, resp);
else
if(method.equals("OPTIONS"))
doOptions(req, resp);
else
if(method.equals("TRACE"))
doTrace(req, resp);
} else
String errMsg = lStrings.getString("http.method_not_implemented");
Object errArgs[] = new Object[1];
errArgs[0] = method;
errMsg = MessageFormat.format(errMsg, errArgs);
resp.sendError(501, errMsg);
}

What the "use JSP presentation" check box does?

Can someone tell me what the "use JSP presentation" check box does? (can't find any documentation)
When I set "Implementation type" to "BPM Object Interactive Call' if a check "use JSP presentation" instead of "Use BPM Object Presentation" and I enter a JSP name can I cause the process to start a JSP ?

Hello,
The option is intended to use a JSP instead of a form for a BPM Object interactive call. This means that you have to prepare your custom JSP, add a special tag library provided by Fuego and "mark" your html tags deciding which of them will become the attributes for the instance of your BPM Object.
Whitin the page you can also call some methods of your objects.
Finally you can post back the data and automatically update your object in the process. There is no much documentation and it's even quite old. Take a look here: [http://download.oracle.com/docs/cd/E13154_01/bpm/docs65/taglib/index.html]
The JSP will be shown as a normal interactive activity popup window. You can customize it as you like, even adding some client side script.
HTH
G

Whats the use of interface

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