Class and it methods

Hello Experts my name is latha I am new to abap objects can any one help me in detail how to implement a class and its methods

Welcome to SDN Forum latha.
Please read [Rules for Asking & Answering in the Forums|https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/rulesofEngagement].
The first thing to do is try to find through the search tool for "ABAP Objects", you'll find various interesting materials.
Also take a look at [ABAP Objects Wiki|https://wiki.sdn.sap.com/wiki/x/o5k] section where you can see information, links and several examples from [beginner to advanced|https://wiki.sdn.sap.com/wiki/x/Aq].
Don't forget to close this thread once your question be answered
Greetings,
Marcelo Ramos

Similar Messages

Nested Classes and Static Methods

I was perusing the Java Tutorials on Nested Classes and I came across this...
[http://java.sun.com/docs/books/tutorial/java/javaOO/nested.html|http://java.sun.com/docs/books/tutorial/java/javaOO/nested.html]
I was reading the documentation and I read a slightly confusing statement. I was hoping some further discussion could clarify the matter. The documentation on "Nested Classes" says (I highlighted the two statements, in bold, I am having trouble piecing together.)
Static Nested Classes
As with class methods and variables, a static nested class is associated with its outer class. And like static class methods, a static nested class cannot refer directly to instance variables or methods defined in its enclosing class ? it can use them only through an object reference.
Note: A static nested class interacts with the instance members of its outer class (and other classes) just like any other top-level class. In effect, a static nested class is behaviorally a top-level class that has been nested in another top-level class for packaging convenience.
So this means a nested static inner class CANNOT refer to its own instanced variables, like a normal static method, but CAN refer to its outer class instanced variables?

So this means a nested static inner class CANNOT refer to its own instanced variables, like a normal static method, but CAN refer to its outer class instanced variables?No, it means that a static nested class cannot refer to instance variables of its enclosing class. Example:public class Foo {
    int i;
    static class Bar {
        int j = i; // WRONG! Bar class is static context
}~

Extending classes and overriding methods

If I have a class which extends another, and overrides some methods, if I from a third class casts the extending class as the super class and calls one of the methods which gets overrided, is it the overrided method or the method of the superclass which get executed?
Stig.

Explicit cast can't enable the object to invoke super-class's method. Because dynamic binding is decided by the instance. The cast can just prevent you from using methods only defined in sub-class, but it does not let the object to use super-class's method, if the method's been overrided. Otherwise, the polymophism, which is one of the most beautiful feature of Object-Oriented thing, can't be achieved. As far as I know, the only way to use super-class's method is the super keyword in the sub-class, and seems no way for an object to do the same thing (I may wrong, since I haven't read the language spec).
here's a small test:
public class Test {
public static void main(String[] args){
A a = new B();
a.method();
((A)a).method();
class A{
public void method(){
System.out.println("A's method");
class B extends A{
public void method(){
System.out.println("B's method");
The output is:
B's method
B's method

ParameterFieldController class and getDataDefController() method missing from com.crystaldecisions.reports.sdk.*

I am trying to use the desktop samples for the JRC. The parameter setting sample will not compile because the ParameterFieldController class and the ReportClientDocument's getDataDefController() method are missing from com.crystaldecisions.reports.sdk.* .
I have release 2 of Crystal Reports XI Developer and should have the most up to date jrcerom.jar file for that product. What is it going to take to get this working? This is a critical aspect of using Crystal Reports for our java application reporting needs.
Prompt attention to this is appreciated.

 That class is not in that package, but another package imported in the sample, and in a different jar file. The readme file should reference a deployment guide listing the required jar files, which I've copied here: <a href="http://support.businessobjects.com/communityCS/TechnicalPapers/cr_xi_r2_jrc_deployment.pdf" target="_blank">http://support.businessobjects.com/communityCS/TechnicalPapers/cr_xi_r2_jrc_deployment.pdf</a>Sincerely,Ted Ueda

Dynamic creation of class and calling methods

I've got and interface called Transformation and then two implementations called TxA and TxB, where TxA and TxB have their own attribtues and setter and getters for these attributes.
The question is, I need to create instances of TxA and TxB and called the setter and getters where I at runtime I only know the attribute to set, how can I create and instance and call the right getters and setters methods?
Thanks in advance

Smart money says your design sucks and needs to be rethought entirely. Can we get specifics?
Drake

How to get class and use method on it

Hi,
class State {
        String name
        Enum expectedValue
        public State(String name,Enum expectedValue){
            this.name = name;
            this.expectedValue = expectedValue;
In the same class I need to have a method that takes a String and it should return matching
Enum value. Since class already have the expectedValue my idea is to get the Enum class ( using that if possible) and
the call get() on it see my example below;
Example:
expectedValue is HwState.UPGRADED;
    public HwState convertActualToStateType( String actual){
        return HwState.get(Integer.valueOf(actual));
How can I get the Enum class (HwState) ? And then use it e.g. HwState.get() ?
//mike

Oracle is not allowing to Pesonlize the Buttons.

Abstract classes and static methods

I have an abstract report class AbstractReportClass which I am extending in multiple report classes (one for each report, say ReportA, ReportB, ...). Each report class has its own static column definitions, title, etc., which I have to access through a static method getDataMeta() in a web application. Each report has the same exact code in getDataMeta, and no report may exist without these fields. My intuition tells me that AbstractReportClass should contain the code for getDataMeta, but I know that you can't mix abstract and static keywords.
Am I missing a simple solution to unify the getDataMeta code in the abstract base class? or do I really need to have a static function getDataMeta with the same code in each of the base classes?
My apologies if this has been discussed many times before.
Thanks,
-Andrew

I'm not trying to be "right"; rather I just asked a question about whether I can do something that seems intuitive. Perhaps you might write code in a different way than I would or perhaps I wasn't clear about every little detail about my code? Do you regularly belittle people who ask questions here?
I have a loadFromDB() member function in AbstractReport for which all sub classes have an overloaded version. All reports I'm displaying have 4 common fields (a database id and a name and a monetary value, for example), but then each other report has additional fields it loads from the database. Inside ReportX classes' loadFromDB(), I call the superclass loadFromDB() function and augment values to get a completely loaded object. In fact, the loadedData member object resides in AbstractReport.
I can't use a report unless it has these common features. Every report is an AbstractReport. There is common functionality built on top of common objects. Isn't this the point of inheritance? I'm essentially saying that abstract class Shape has a getArea function and then I'm defining multiple types of Shapes (e.g. Rectangle and Circle) to work with...

Abstract class with set and get methods

hi
how to write set and get methods(plain methods) in an abstartc class
ex: setUsername(String)
String getUsername()
and one class is extending this abstract class and same methods existing in that sub class also..... how to write......plz provide some ideas
am new to programming....
asap
thnx in advance

yes... as i told u.... i am new to coding......
and my problem is ..... i have 2 classes one is abstract class without abstract methods.. and another class is extending abstract class.....
in abstract class i have 2 methods...one is setusername(string) and getusername() ..... how to write these two methods.... in abstract class i have private variables username...... when user logins ..... i need to catch the user name and i need to validate with my oracle database and i need to identify the role of that user and based on role of that user i need to direct him to appropriate jsp page.......
for that now i am writing business process classes..... the above mentioned two classes are from business process.....
could u help me now
thnx in advance

Why does this abstract class and method work without implement it?

hi,
I have seen many times that in some examples that there are objects made from abstract classes directly. However, in all books, manual and tutorials that I've read explain that we MUST implement those methods in a subclass.
An example of what I'm saying is the example code here . In a few words that example makes Channels (java.nio.channel) and does operations with them. My problem is in the class to make this channels, because they used the ServerSockeChannel class and socket() method directly despite they are abstracts.
 // Create a new channel: if port == 0, FileChannel on /dev/tty, else
 // a SocketChannel from the first accept on the given port number
private static ByteChannel newChannel (int netPort)
 throws Exception
 if (netPort == 0) {
 FileInputStream fis = new FileInputStream ("/dev/tty");
 return (fis.getChannel());
 } else {
//CONFLICT LINES
 ServerSocketChannel ssc = ServerSocketChannel.open(); //<--I have never thought do that!! Anyway, how it is static method may work.
 ssc.socket().bind (new InetSocketAddress (netPort)); //<--but here, this method (socket) is abstract. WHY RETURN A SOCKET???????? this mehod should be empty by default.
 System.out.print ("Waiting for connection on port "
 + netPort + "...");
 System.out.flush();
 ByteChannel channel = ssc.accept();
 ssc.close();
 System.out.println ("Got it");
 return (channel);
 } I test this code and works fine. So why can it be??
Also, I read that the abstract classes can't have static methods. Is it true???
Please Help!!
PS: i have seen this kind of code many times. So i feel that I don't understand how its really the abstract methods are made.
PS2: I understand that obviously you don't do something like this: *"obj = new AbstractClass(); "*. I dont understand how it could be: ServerSocketChannel ssc = ServerSocketChannel.open(); and the compiler didn't warn.

molavec wrote:
ServerSocketChannel ssc = ServerSocketChannel.open(); //<--I have never thought do that!! Anyway, how it is static method may work.
The static method creates an instance of a class which extends ServerSocketChannel, but is actually another non-abstract class.I thought that, but reading the documentation I saw that about open() method:
Opens a server-socket channel.
The new channel is created by invoking the openServerSocketChannel method of the system-wide default SelectorProvider object.
The new channel's socket is initially unbound; it must be bound to a specific address via one of its socket's bind methods before connections can be accepted.
...and the problem is the same openServerSocketChannel is abstract, so i don't understand how it could return a ServerSocketChannel.There is a concrete implementation class that has implemented that method.
I guess that really the open() method use a SelectorProvider's subclase but it doesn't appear in the doc.It doesn't need to. First, you don't care about those implementation details, and second, you know that if the class is abstract, it must use some concrete subclass.
Ok, I speak Spanish by default (<-- this sounds like "I am a machine", ^_^' ). So, I didn't know how to say that the method would be {}. Is there a way to say that?? I recommendable for me to know, for the future questions o answers.Not sure what you're saying here. But the other respondent was trying to explain to you the difference between an abstract method and an empty method.
// abstract method
public abstract void foo();
// empty method
public void bar() {
Which class does extend ServerSocketChannel? I can not see it.It may be a package-private class or a private nested class. There's no need to document that specific implementation, since you never need to use it directly.

Using Classes and Methods

Hi Experts,
I am studying ABAP Objects, before that I need to know How to use the exsiting classes and Methods in our program and how to search for particular class and methods?
If it explanied with example well and good.
Thanks
sai

Hi Saikar,
Here i am sending you very useful content for the usage of classes and its methods.
It helped me a lot.
If you find it useful then do not forget to award points.
Table of Contents
Applies to:......................................................................................................................................1
Summary........................................................................................................................................1
Author Bio......................................................................................................................................1
Main Class CL_SALV_TABLE......................................................................................................3
Functions CL_SALV_FUNCTIONS..............................................................................................4
Display Settings CL_SALV_DISPLAY_SETTINGS......................................................................4
Columns CL_SALV_COLUMNS_TABLE and CL_SALV_COLUMN_TABLE..............................5
Sorts CL_SALV_SORTS..............................................................................................................8
Aggregations CL_SALV_AGGREGATIONS..............................................................................10
Filters CL_SALV_FILTERS........................................................................................................12
Layouts CL_SALV_LAYOUT......................................................................................................14
Related Content...........................................................................................................................15
Disclaimer and Liability Notice.......................................................................................................16
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 3
Main Class CL_SALV_TABLE
The main class used to create the simple 2D table is the class CL_SALV_TABLE. Create a reference variable for this class. Create an internal table and fill this internal table with data as show below.
REPORT ZALVOM_DEMO1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. start-of-selection. select * into table ispfli from spfli.
Next we need to create the ALV object for the 2D table. The FACTORY method allows you to create the ALV object in 3 ways. You can create the ALV Grid, as a classical list display, as a full screen grid, and finally embedded into a screen container. For this example, we will be working with the full screen grid. Create the call to the FACTORY method. We are importing the object reference into GR_TABLE and passing the internal table ISPFLI.
cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ).
Next we need to display the grid, for this we use the DISPLAY method . Simply call it.
gr_table->display( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 4
Functions CL_SALV_FUNCTIONS
Next, add functions to the application toolbar. For this, use the CL_SALV_FUNCTIONS class. Create the object reference variable and receive the object using the GET_FUNCTIONS method of the GR_TABLE object. Call the method SET_ALL to force the ALV grid to show all standard functions.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_table->display( ).
The result is now you have the standard buttons on the application toolbar.
Display Settings CL_SALV_DISPLAY_SETTINGS
Next, we can change some display settings using the class CL_SALV_DISPLAY_SETTINGS. Create the object reference variable and receive the object using the GET_DISPLAY_SETTINGS method of the GR_TABLE object. In this example, we are setting the Striped Pattern for the ALV Grid rows, and setting the heading in the title bar.
report zalvom_demo1.
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 5
). data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. data: gr_display type ref to cl_salv_display_settings. start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' gr_table->display( ).
Columns CL_SALV_COLUMNS_TABLE and CL_SALV_COLUMN_TABLE
Next, we can change some of the attributes of a specific column in the ALV grid. In this example we will change the Heading Text of a column as well as the color of a column. Create the object reference variable and receive the object using the GET_COLUMNS method of the GR_TABLE object. This will pass you the object for all columns of the ALV grid. To access just one column, call the method GET_COLUMN from the GR_COLUMNS object. In this example, we are accessing the CITYTO column and the CITYFROM column.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions.
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 6
data: gr_display type ref to cl_salv_display_settings. data: gr_columns type ref to cl_salv_columns_table. data: gr_column type ref to cl_salv_column_table.
data: color type lvc_s_colo.
start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' ). gr_columns = gr_table->get_columns( ). gr_column ?= gr_columns->get_column( 'CITYTO' ). gr_column->set_long_text( 'This is long text' ). gr_column->set_medium_text( 'This is med text' ).
gr_column->set_short_text( 'This is sh' ).
gr_column ?= gr_columns->get_column( 'CITYFROM' ). color-col = '6'. color-int = '1'. color-inv = '0'. gr_column->set_color( color ).
gr_table->display( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 7 ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 8
Sorts CL_SALV_SORTS
Next, we can add some sorting to the ALV grid. Create the object reference variable and receive the object using the GET_SORTS method of the GR_TABLE object. Next, add the sort by calling the ADD_SORT method of the GR_SORTS object.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. data: gr_display type ref to cl_salv_display_settings. data: gr_columns type ref to cl_salv_columns_table. data: gr_column type ref to cl_salv_column_table. data: gr_sorts type ref to cl_salv_sorts.
data: color type lvc_s_colo.
start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' ). gr_columns = gr_table->get_columns( ). gr_column ?= gr_columns->get_column( 'CITYTO' ). gr_column->set_long_text( 'This is long text' ). gr_column->set_medium_text( 'This is med text' ). gr_column->set_short_text( 'This is sh' ). gr_column ?= gr_columns->get_column( 'CITYFROM' ). color-col = '6'. color-int = '1'. color-inv = '0'. gr_column->set_color( color ). gr_sorts = gr_table->get_sorts( ). gr_sorts->add_sort 'CITYTO' ). gr_table->display( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 9 ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 10
Aggregations CL_SALV_AGGREGATIONS
Since we sorted by CITYTO, we can add an aggregation to subtotal the DISTANCE by CITYTO. Create the object reference variable and receive the object using the GET_AGGREGATIONS method of the GR_TABLE object. Next, add the aggregation by calling the ADD_AGGREGATION method of the GR_SORTS object. We also need to modify the call to ADD_SORT to set the SUBTOTAL = ABAP_TRUE.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. data: gr_display type ref to cl_salv_display_settings. data: gr_columns type ref to cl_salv_columns_table. data: gr_column type ref to cl_salv_column_table. data: gr_sorts type ref to cl_salv_sorts. data: gr_agg type ref to cl_salv_aggregations.
data: color type lvc_s_colo.
start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' ). gr_columns = gr_table->get_columns( ). gr_column ?= gr_columns->get_column( 'CITYTO' ). gr_column->set_long_text( 'This is long text' ). gr_column->set_medium_text( 'This is med text' ). gr_column->set_short_text( 'This is sh' ). gr_column ?= gr_columns->get_column( 'CITYFROM' ). color-col = '6'. color-int = '1'. color-inv = '0'. gr_column->set_color( color ). gr_sorts = gr_table->get_sorts( ). gr_sorts->add_sort( columnname = 'CITYTO' subtotal = abap_true ). gr_agg = gr_table->get_aggregations( ). gr_agg->add_aggregation( 'DISTANCE' ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 11
gr_table->display( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 12
Filters CL_SALV_FILTERS
Using the CL_SALV_FILTERS class we can setup some filters for the data in our ALV GRID. Create the object reference variable and receive the object using the GET_FILTERS method of the GR_TABLE object, and then simply called the method ADD_FILTER with the parameters.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. data: gr_display type ref to cl_salv_display_settings. data: gr_columns type ref to cl_salv_columns_table. data: gr_column type ref to cl_salv_column_table. data: gr_sorts type ref to cl_salv_sorts. data: gr_agg type ref to cl_salv_aggregations. data: gr_filter type ref to cl_salv_filters.
data: color type lvc_s_colo.
start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' ). gr_columns = gr_table->get_columns( ). gr_column ?= gr_columns->get_column( 'CITYTO' ). gr_column->set_long_text( 'This is long text' ). gr_column->set_medium_text( 'This is med text' ). gr_column->set_short_text( 'This is sh' ). gr_column ?= gr_columns->get_column( 'CITYFROM' ). color-col = '6'. color-int = '1'. color-inv = '0'. gr_column->set_color( color ). gr_sorts = gr_table->get_sorts( ). gr_sorts->add_sort( columnname = 'CITYTO' subtotal = abap_true ). gr_agg = gr_table->get_aggregations( ). gr_agg->add_aggregation( 'DISTANCE' ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 13
gr_filter = gr_table->get_filters( ). gr_filter->add_filter( columnname = 'CARRID' low = 'LH' ). gr_table->display( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 14
Layouts CL_SALV_LAYOUT
If you want to allow the user to manage layouts of the ALV grid, you must use the class CL_SALV_LAYOUT. Create the object reference variable and receive the object using the GET_LAYOUT method of the GR_TABLE object. Then simply call the method SET_KEY with the parameters and set the save restriction using the SET_SAVE_RESTRICTION method.
report zalvom_demo1. data: ispfli type table of spfli. data: gr_table type ref to cl_salv_table. data: gr_functions type ref to cl_salv_functions. data: gr_display type ref to cl_salv_display_settings. data: gr_columns type ref to cl_salv_columns_table. data: gr_column type ref to cl_salv_column_table. data: gr_sorts type ref to cl_salv_sorts. data: gr_agg type ref to cl_salv_aggregations. data: gr_filter type ref to cl_salv_filters. data: gr_layout type ref to cl_salv_layout. data: color type lvc_s_colo. data: key type salv_s_layout_key. start-of-selection. select * into table ispfli from spfli. cl_salv_table=>factory( importing r_salv_table = gr_table changing t_table = ispfli ). gr_functions = gr_table->get_functions( ). gr_functions->set_all( abap_true ). gr_display = gr_table->get_display_settings( ). gr_display->set_striped_pattern( cl_salv_display_settings=>true ). gr_display->set_list_header( 'This is the heading' ). gr_columns = gr_table->get_columns( ). gr_column ?= gr_columns->get_column( 'CITYTO' ). gr_column->set_long_text( 'This is long text' ). gr_column->set_medium_text( 'This is med text' ). gr_column->set_short_text( 'This is sh' ). gr_column ?= gr_columns->get_column( 'CITYFROM' ). color-col = '6'. color-int = '1'. color-inv = '0'. gr_column->set_color( color ). gr_sorts = gr_table->get_sorts( ). gr_sorts->add_sort( columnname = 'CITYTO' subtotal = abap_true ). gr_agg = gr_table->get_aggregations( ).
ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 15
gr_filter = gr_table->get_filters( ). gr_layout = gr_table->get_layout( ). gr_layout->set_key( ). gr_table->display( ). gr_agg->add_aggregation( 'DISTANCE' ). gr_filter->add_filter( columnname = 'CARRID' low = 'LH' ). key-report = sy-repid. key gr_layout->set_save_restriction( cl_salv_layout=>restrict_none ).
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ALV Object Model Simple 2D Table - The Basics SAP DEVELOPER NETWORK | sdn.sap.com BUSINESS PROCESS EXPERT COMMUNITY | bpx.sap.com © 2006 SAP AG 16
Disclaimer and Liability Notice
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SAP will not be held liable for any damages caused by using or misusing the information, code or methods suggested in this document, and anyone using these methods does so at his/her own risk.
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Regards,
Mandeep.
Note: Award points if contents are useful.

Table with overview inherited and redefined method of class

Hi,
is there a table that indicates which method is inheriting the method of the superclass and which method is redefined ?
I'm having a superclass with a lot of methods and a lot of subclasses.
Now i'm checking every subclass separately if the methods are inherited or redefined. A table would be great.
best regards,
Hans

In Class builder you can group them as per the Super Class and Interface methods.
Go to SE24, open your class
Utilities > Settings > Class Builder
Select the Checkbox "Group By Interfaces and Superclasses"
Redefined methods would appear with Black Color in the Group.
You can also find the Redefined methods in the table SEOREDEF.
Regards,
Naimesh Patel

Static class and clustering

          I have a static class that I use to cache some values during a batch process. The
          batch process uses a JMS queue to parcel our identical units of work to MDBs.
          I want this to scale using a cluster with the same MDBs on multiple machines.
          Everything works fine except that I can't figure out how to tell my cache to clear
          itself out on every node between batch runs. Is there a pattern or solution to
          this problem?
          What I've tried is to create a stateless session bean method that clears my cache.
          At the begining of my batch job, (which is a stateless session bean call) I call
          this method on each server in the cluster by getting the remote interface for
          the stateless bean via the different URLs of the servers. However, the session
          bean method always executes on the one server where I make the call. It's as if
          WebLogic gives me back a local interface instead of the remote interface that
          I asked for.
          Any ideas would be appreciated.
          Colin


... static class and static method.I have never heard of a thing called "static class". Perhaps you mean a class with only static members?
My design approach (which is bound to needs of the moment and seldom to library-development or future re-use, since both is harder than most developers realize) is to develop straight without caring too much about static or not. When a method is done, debugged and works well, it happens that other objects access this method as well.
It may happen that I just want to use this single method and almost nothing else of the object. If that is the case, I can start looking if it's a Good Thing(tm) to make the method static, so no object creation is needed just for the one method. Sometimes it can be done, sometimes not.
But that's just me and you'll find quite a lot of coders that'll advice you to decide what's static and what not before you start coding. And that's as good an advice as most others you can get.
In the end it's your decision, so start fiddling around and see what fits best for you.
-T-

Singleton pattern class and static class

Hi,
what is difference between the singleton pattern class and static class ?
in singleton pattern, we declare a static member[which hold one value at a time] ,static method[ which return static member value] and a private constructor[not allow to direct instantiation]. My words are -- as a singleton pattern we implement static class .
so can we say a singleton pattern is static class it means both are same or is any difference between these two ??

malcolmmc wrote:
On several occasions I've had to convert a static (never instanceated) class to a singleton type, for example because I realise I need an instance per thread, or I decide to make a program more modular, with more than one configuration.
I've never done the opposite.
So generally I favour the singleton if there any "state" involved, because it's more flexible in unanticipated directions. It also gives extra flexibility when building tests, especially if you program to an interface.Total agreement; if anything it is dead hard to override static method logic with mock code in unit tests (I had to do it by keeping the static methods in place but making them internally use a singleton instance of itself of which the instance variable could be overwritten with a mock implementation for unit testing purposes...).
'Static classes' and/or methods are great for very simple util functions, but I wouldn't use them for anything other than that.

Can I use classes and methods for a maintenance view events?

Hello experts,
Instead of perform/form, can I instead use classes and methods, etc for a given maintenance view event, lets say for example I want to use event '01' which is before saving records in the database. Help would be greatly appreciated. Thanks a lot guys!

Hi viraylab,
1. The architecture provided by maintenance view
   for using EVENTS and our own code inside it -
   It is provided using FORM/PERFORM
   concept only.
2. At this stage,we cannot use classes.
3. However, inside the FORM routine,
   we can write what ever we want.
   We can aswell use any abap code, including
   classes and methods.
(But this classes and methods won't have any
   effect on the EVENT provided by maintenance view)
regards,
amit m.

How we can use class and methods for the FM of reuse_alv_list_display

Hi Abapers,
Please provide the sample code of class and method of REUSE_ALV_LIST_DISPLAY.
Which Class i can use for this Function module.
I need to write a code using OOPS concept.
I was done the GRID display using this class cl_gui_alv_grid.
But i want only List Display using the class & methods.
Plz provide sample code.
Thanks
Nani.

Hi Nani,
This is the sample code..
*& Report Z_OO_ALV
*& We can Use Two containers in OOALV
REPORT z_oo_alv LINE-COUNT 50.
*types gt_struct type sflight.
DATA BEGIN OF gt_struct.
INCLUDE STRUCTURE sflight.
DATA rcol(4) TYPE c.
DATA colors TYPE lvc_t_scol.
DATA END OF gt_struct.
*ALV GRIDs
DATA gr_alvgrid TYPE REF TO cl_gui_alv_grid.
DATA gr_alvgrid1 TYPE REF TO cl_gui_alv_grid.
DATA gc_custom_control_name TYPE scrfname VALUE 'CC_ALV'.
DATA gc_custom_control_name1 TYPE scrfname VALUE 'CC_ALV1'.
*CONTAINERs
DATA gr_ccontainer TYPE REF TO cl_gui_custom_container.
DATA gr_ccontainer1 TYPE REF TO cl_gui_custom_container.
*FIELDCATALOGs
DATA gt_fieldcat TYPE lvc_t_fcat WITH HEADER LINE.
DATA gt_fieldcat1 TYPE lvc_t_fcat WITH HEADER LINE.
*LAYOUTs
DATA gs_layout TYPE lvc_s_layo.
DATA gs_layout1 TYPE lvc_s_layo.
DATA pt_exclude TYPE ui_functions. "internal table declaration to be passed.
*DATA pt_cell TYPE lvc_t_cell with header line.
DATA : gt_list LIKE gt_struct OCCURS 50 WITH HEADER LINE,
gt_list1 LIKE gt_struct OCCURS 50 WITH HEADER LINE.
*DATA v_ucomm TYPE sy-ucomm.
CALL SCREEN 100.
*& Module display_alv OUTPUT
text
MODULE display_alv OUTPUT.
PERFORM display_alv.
ENDMODULE. " display_alv OUTPUT
*& Module PAI INPUT
text
MODULE pai INPUT.
CASE sy-ucomm.
WHEN 'EXIT'.
PERFORM exit_program.
WHEN 'PICK'.
PERFORM cell_info.
ENDCASE.
ENDMODULE. " PAI INPUT
*& Form display_alv
text
FORM display_alv.
PERFORM prepare_field_catalog CHANGING gt_fieldcat[].
PERFORM prepare_layout CHANGING gs_layout.
PERFORM data_retrival.
IF gr_alvgrid IS INITIAL.
CREATE OBJECT gr_ccontainer
EXPORTING
container_name = gc_custom_control_name
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
create_error = 3
lifetime_error = 4
lifetime_dynpro_dynpro_link = 5
OTHERS = 6.
IF sy-subrc <> 0.
ENDIF.
CREATE OBJECT gr_alvgrid
EXPORTING
I_SHELLSTYLE = 0
I_LIFETIME =
i_parent = gr_ccontainer
I_APPL_EVENTS = space
I_PARENTDBG =
I_APPLOGPARENT =
I_GRAPHICSPARENT =
I_NAME =
I_FCAT_COMPLETE = SPACE
EXCEPTIONS
error_cntl_create = 1
error_cntl_init = 2
error_cntl_link = 3
error_dp_create = 4
OTHERS = 5
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
PERFORM exclude_tb_functions CHANGING pt_exclude.
PERFORM set_col.
CALL METHOD gr_alvgrid->set_table_for_first_display
EXPORTING
I_BUFFER_ACTIVE =
I_BYPASSING_BUFFER =
I_CONSISTENCY_CHECK =
I_STRUCTURE_NAME =
IS_VARIANT =
I_SAVE =
I_DEFAULT = 'X'
is_layout = gs_layout
IS_PRINT =
IT_SPECIAL_GROUPS =
it_toolbar_excluding = pt_exclude "excluding toolbar functions
IT_HYPERLINK =
IT_ALV_GRAPHICS =
IT_EXCEPT_QINFO =
IR_SALV_ADAPTER =
CHANGING
it_outtab = gt_list[]
it_fieldcatalog = gt_fieldcat[]
IT_SORT =
IT_FILTER =
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
ELSE.
CALL METHOD gr_alvgrid->refresh_table_display
EXPORTING
IS_STABLE =
I_SOFT_REFRESH =
EXCEPTIONS
finished = 1
OTHERS = 2
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ENDIF.
PERFORM prepare_field_catalog1 CHANGING gt_fieldcat1[].
PERFORM prepare_layout1 CHANGING gs_layout1.
PERFORM data_retrival1.
IF gr_alvgrid1 IS INITIAL.
CREATE OBJECT gr_ccontainer1
EXPORTING
container_name = gc_custom_control_name1
EXCEPTIONS
cntl_error = 1
cntl_system_error = 2
create_error = 3
lifetime_error = 4
lifetime_dynpro_dynpro_link = 5
OTHERS = 6.
IF sy-subrc <> 0.
ENDIF.
CREATE OBJECT gr_alvgrid1
EXPORTING
I_SHELLSTYLE = 0
I_LIFETIME =
i_parent = gr_ccontainer1
I_APPL_EVENTS = space
I_PARENTDBG =
I_APPLOGPARENT =
I_GRAPHICSPARENT =
I_NAME =
I_FCAT_COMPLETE = SPACE
EXCEPTIONS
error_cntl_create = 1
error_cntl_init = 2
error_cntl_link = 3
error_dp_create = 4
OTHERS = 5
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
PERFORM set_col1.
CALL METHOD gr_alvgrid1->set_table_for_first_display
EXPORTING
I_BUFFER_ACTIVE =
I_BYPASSING_BUFFER =
I_CONSISTENCY_CHECK =
I_STRUCTURE_NAME =
IS_VARIANT =
I_SAVE =
I_DEFAULT = 'X'
is_layout = gs_layout1
IS_PRINT =
IT_SPECIAL_GROUPS =
IT_TOOLBAR_EXCLUDING =
IT_HYPERLINK =
IT_ALV_GRAPHICS =
IT_EXCEPT_QINFO =
IR_SALV_ADAPTER =
CHANGING
it_outtab = gt_list1[]
it_fieldcatalog = gt_fieldcat1[]
IT_SORT =
IT_FILTER =
EXCEPTIONS
invalid_parameter_combination = 1
program_error = 2
too_many_lines = 3
OTHERS = 4
IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
ELSE.
CALL METHOD gr_alvgrid1->refresh_table_display
EXPORTING
IS_STABLE =
I_SOFT_REFRESH =
EXCEPTIONS
finished = 1
OTHERS = 2
IF sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ENDIF.
ENDFORM. "display_alv
*& Form prepare_field_catalog
text
-->GT_FIELDCAT text
FORM prepare_field_catalog CHANGING pgt_fieldcat TYPE lvc_t_fcat.
DATA ls_fieldcat TYPE lvc_s_fcat.
ls_fieldcat-tabname = 'gt_list'.
ls_fieldcat-fieldname = 'CARRID'.
ls_fieldcat-scrtext_m = 'Air line code'.
ls_fieldcat-col_pos = 0.
ls_fieldcat-outputlen = 10.
ls_fieldcat-emphasize = 'C400'.
ls_fieldcat-key = 'X'.
APPEND ls_fieldcat TO pgt_fieldcat.
ls_fieldcat-tabname = 'gt_list'.
ls_fieldcat-col_pos = 1.
ls_fieldcat-fieldname = 'CONNID'.
ls_fieldcat-scrtext_m = 'Connection code'.
ls_fieldcat-emphasize = 'C900'.
APPEND ls_fieldcat TO pgt_fieldcat.
ls_fieldcat-tabname = 'gt_list'.
ls_fieldcat-fieldname = 'PRICE'.
ls_fieldcat-scrtext_m = 'PRICE'.
APPEND ls_fieldcat TO pgt_fieldcat.
ENDFORM. "prepare_field_catalog
*& Form prepare_layout
text
-->GS_LAYOUT text
FORM prepare_layout CHANGING gs_layout TYPE lvc_s_layo.
gs_layout-stylefname = 'FIELD_STYLE'.
gs_layout-zebra = 'X'.
gs_layout-grid_title = 'FLIGHT'.
gs_layout-sel_mode = 'A'.
gs_layout-ctab_fname = 'COLORS'.
ENDFORM. "prepare_layout
*& Form data_retrival
text
FORM data_retrival.
SELECT carrid
connid
price
FROM sflight
INTO CORRESPONDING FIELDS OF TABLE gt_list
UP TO 50 ROWS.
ENDFORM. "data_retrival
FORM EXIT_PROGRAM *
FORM exit_program.
CALL METHOD gr_ccontainer->free.
CALL METHOD gr_ccontainer1->free.
LEAVE TO SCREEN 0.
ENDFORM. "exit_program
*& Module STATUS_0100 OUTPUT
text
MODULE status_0100 OUTPUT.
SET PF-STATUS 'STAT'.
SET TITLEBAR 'xxx'.
IF W_CUSTOM_CONTAINER IS INITIAL.
**sets TITLEBAR
PERFORM TITLEBAR.
ENDMODULE. " STATUS_0100 OUTPUT
*& Form prepare_field_catalog1
text
-->GT_FIELDCAT text
FORM prepare_field_catalog1 CHANGING pgt_fieldcat1 TYPE lvc_t_fcat.
DATA ls_fieldcat TYPE lvc_s_fcat.
ls_fieldcat-tabname = 'gt_list1'.
ls_fieldcat-fieldname = 'SEATSMAX'.
ls_fieldcat-scrtext_m = 'MAX. SEATS'.
ls_fieldcat-col_pos = 0.
ls_fieldcat-outputlen = 10.
ls_fieldcat-emphasize = 'C400'.
ls_fieldcat-key = ' '.
APPEND ls_fieldcat TO pgt_fieldcat1.
ls_fieldcat-tabname = 'gt_list1'.
ls_fieldcat-col_pos = 1.
ls_fieldcat-fieldname = 'SEATSOCC'.
ls_fieldcat-scrtext_m = 'SEATS OCCUPIED'.
APPEND ls_fieldcat TO pgt_fieldcat1.
ENDFORM. "prepare_field_catalog
*& Form prepare_layout1
text
-->GS_LAYOUT text
FORM prepare_layout1 CHANGING gs_layout1 TYPE lvc_s_layo.
gs_layout1-stylefname = 'FIELD_STYLE'.
gs_layout1-zebra = 'X'.
gs_layout1-grid_title = 'DETAILS'.
gs_layout-sel_mode = 'C'.
gs_layout1-info_fname = 'RCOL'.
gs_layout-no_toolbar = 'X'.
ENDFORM. "prepare_layout
*& Form data_retrival1
text
FORM data_retrival1.
SELECT seatsmax
seatsocc
FROM sflight
INTO CORRESPONDING FIELDS OF TABLE gt_list1
UP TO 50 ROWS.
ENDFORM. "data_retrival
*& Form exclude_tb_functions
&---- subroutine to exclude toolbar options -
text
-->PT_EXCLUDE text
FORM exclude_tb_functions CHANGING pt_exclude TYPE ui_functions.
DATA ls_exclude TYPE ui_func.
ls_exclude = cl_gui_alv_grid=>mc_fc_maximum.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_fc_minimum.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_fc_subtot.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_fc_sort.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_fc_sum.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_mb_subtot.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_mb_sum.
APPEND ls_exclude TO pt_exclude.
ls_exclude = cl_gui_alv_grid=>mc_mb_filter.
APPEND ls_exclude TO pt_exclude.
ENDFORM. "data_retrival1
*& Form cell_info
text
FORM cell_info. "CHANGING pt_cell TYPE lvc_t_cell.
DATA lt_cell TYPE lvc_t_cell WITH HEADER LINE.
CALL METHOD gr_alvgrid->get_selected_cells
IMPORTING
et_cell = lt_cell[].
LOOP AT lt_cell.
WRITE : lt_cell-col_id , lt_cell-row_id.
ENDLOOP.
MODIFY pt_cell[] from lt_cell[].
ENDFORM. "cell_info
*& Form set_col
text
FORM set_col .
DATA ls_cellcolor TYPE lvc_s_scol.
LOOP AT gt_list.
IF gt_list-price GT 500.
ls_cellcolor-fname = 'PRICE'.
ls_cellcolor-color-col = 5.
ls_cellcolor-color-int = 1.
ls_cellcolor-color-inv = 0.
APPEND ls_cellcolor TO gt_list-colors.
else.
ls_cellcolor-fname = 'PRICE'.
ls_cellcolor-color-col = 3.
ls_cellcolor-color-int = 1.
APPEND ls_cellcolor TO gt_list-colors.
ENDIF.
MODIFY gt_list.
ENDLOOP.
ENDFORM. "set_col
*& Form set_col1
text
FORM set_col1.
data : ind type sy-tabix,
indx type sy-tabix.
loop at gt_list1.
ind = sy-tabix / 2.
indx = sy-tabix - ind.
if indx eq ind.
gt_list1-rcol = 'C500'.
endif.
MODIFY gt_list1.
endloop.
ENDFORM. "set_col
*FORM TITLEBAR.
*SET TITLEBAR 'TITLE'.
*ENDFORM.
*double click on TITLE and write ur title
Thanks,
Samantak.
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