Declaration method in users Class

What's different between declaration method in these codes
class Programm
ClassA class1 = new ClassA();
class1.TestMethod();
public ClassA
public void TestMethod()
and
class Programm
ClassA.TestMethod();
public ClassA
internal static void TestMethod()

There are 2 main differences.
Your access modifier is different (public / internal). See this link for information about the 4 different access modifier. https://msdn.microsoft.com/en-us/library/ms173121.aspx
Your first method has instance scope and the second one has a static/global scope. See this link on what the difference is between the 2. https://msdn.microsoft.com/en-us/library/aa645629(v=vs.71).aspx
-Igor

Similar Messages

Syntax Error "Method was not declared or inherited in class"

Dear all,
I am seeing the following syntax error in one of the standard classes CL_ICCMP_BT_INRHISTRESULT_CN01 which says "Method "XYZ" was not declared or inherited in class". Need help to identify when this error would occur or where I should be checking for this error within the class.
I checked other systems for the same class, the method XYZ does not exist there too but still the class has no syntax errors!
Would appreciate your help!
Thank you.
Regards,
Gayathri.

Hi Gayathri,
please give detailed information on how and where you get this error.
CL_ICCMP_BT_INRHISTRESULT_CN01 does not exist in our ECC600 system.
Regards,
Clemens

Interfaces declare methods that one or more classes may or may not implemen

Interfaces declare methods that one or more classes may or may not implement.
true or false?

Encephalopathic wrote:
If you want to appear to be more than just someone scrounging for someone else to do their homeworkHe/she is what they is
[http://forum.java.sun.com/thread.jspa?threadID=5292343]
[http://forum.java.sun.com/thread.jspa?threadID=5283461]
[http://forum.java.sun.com/thread.jspa?threadID=5283412]
[http://forum.java.sun.com/thread.jspa?threadID=5279385]

Creating user view using 'createView' method of RemoteSession class

Hi
I am trying to create a user view using createView method of RemoteSesson class.
the code is as follows:
remoteSession = (RemoteSession)SessionFactory.getSession(REMOTE_HOST, ADMIN_ID, encryptedPassword);
HashMap map = new HashMap();
map.put("type", "User");
map.put("viewId", "User");
GenericObject obj =
remoteSession.createView("#ID#3DA2A7588B5510DC:-4D08423:10AAD335A14:-7FEE", map);
I get the following error on the server side:
WavesetException: Missing object type
com.waveset.util.WavesetException: Missing object type
     at com.waveset.util.WavesetException.checkBreakpoint(WavesetException.java:366)
     at com.waveset.util.WavesetException.<init>(WavesetException.java:133)
     at com.waveset.rpc.GenericMessageHandler.createView(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.waveset.rpc.GenericMessageHandler.request(Unknown Source)
     at com.waveset.rpc.SimpleRpcHandler.doRequest(SimpleRpcHandler.java:164)
     at com.waveset.rpc.SimpleRpcHandler.doRequest(SimpleRpcHandler.java:128)
     at org.openspml.server.SOAPRouter.doPost(SOAPRouter.java:500)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
     at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     at java.lang.Thread.run(Thread.java:595)
Could anyone tell me what is wrong with this code?
Thanks!

hi carlos,
yes it is possible. as a reference please have a look at this document How to Reference External JAR Files in Web Dynpro DC in SAP NW Portal 7.3
basically the steps are the same (adding dependency, public parts, etc.) for a ejb or java project.
regards,
christian

Calling method from another class

Got the below code for the Bank class with a log in system, Want i need is a While loop for
"While ValidUser = True, Do method in Accounts class."
package bank;
import javax.swing.*;
import java.lang.*;
public class Bank {
              /*User Arrays */
    public String Customer[]= new String[4];
    public String Pin[] = new String[4];
             /* User Tryed details */
        String User;
      String PinAuth;
Boolean ValidUser;
public Bank ()
              /*Customers */
          Customer[0]="John";
    Customer[1]="Alan";
    Customer[2]="Lisa";
    Customer[3]="Liam";
    Pin[0]="1234";
    Pin[1]="1982";
    Pin[2]="4321";
    Pin[3]="5678";
public Bank(String CustAtt, String PinAtt)
     User = CustAtt;
     PinAuth = PinAtt;
public String getUser()
    return User;
public String getPin()
    return PinAuth;
public void setUser(String CustAtt)
    User = CustAtt;
public void setPin(String PinAtt)
    PinAuth = PinAtt;
public static void main    (String args[] ){
System.out.println("Welcome to The Bank of Scotland");
      String User;
      String PinAtt;
    boolean ValidUser;
      /* Get User Details */
     User =
            JOptionPane.showInputDialog("Please Enter Your Name");
    /* Get User pin */
     PinAtt =
            JOptionPane.showInputDialog("Enter your Pin");
/* Print USer Details */
     System.out.println(User);
     System.out.println(PinAtt);
/* Authorise Customer */
Bank newBank = new Bank();
for(int i=0; i<4;i++)
if(User.equals(newBank.Customer) && PinAtt.equals(newBank.Pin[i]))
ValidUser=true;
else
ValidUser=false;
if(ValidUser=true)
System.out.println("Auth");
else if(ValidUser=false)
System.out.println("Log in details are in correct");
while(ValidUser=true)
Account Class, in this class i need options for selecting withdraw deposit and close account, not sure if i could do this in the Current account class though.
Any advice will be great package bank;
import javax.swing.*;
import java.lang.*;
public class Account {
private String AccountNo;
private int Balance;
private int Deposit;
String AccountUsed;
public Account () {
public String getAccountNo ()
return AccountNo;
public void setAccountNo (int val) {
AccountUsed = AccountNo;
public int getBalance () {
return Balance;
public void setBalance (int val) {
this.Balance = val;
public int getDeposit ()
return Deposit;
public void setDeposit (int val)
this.Deposit = val;
this.Balance=this.Balance+this.Deposit;
public void setWithdrawl (int val)
this.Balance=this.Balance-val;
public static void account (String args[] ){
String Deposit = new String();
String Withdraw = new String() ;
System.out.println("Deposit - Withdraw");
Account newAccount = new Account();
Deposit =
JOptionPane.showInputDialog("Enter the ammount you wish to deposit");
Withdraw =
JOptionPane.showInputDialog("Enter the amount you wish to Withdraw");
System.out.println(Deposit);
System.out.println(Withdraw);
Account custAccount =new Account();
custAccount.setDeposit(Integer.parseInt(Deposit));
custAccount.setWithdrawl(Integer.parseInt(Withdraw));
System.out.println(custAccount.getBalance());

Maxideon wrote:
All of these are valid,
while(validUser == true) {
while(validUser) {
//I prefer this one
if(validUser == true) {
if(validUser) {
//I prefer this one
} What you have,
if(validUser = true) {
if(validUser = false) {
}is different. I have two equal signs, while you have one. What do you think one equal sign does?
P.S. All your variable names are screwed up. They should begin with a lower case letter.
Edit
Some other anomalies: you declared ValidUser as a Boolean and you imported java.lang. .... Why?
Edit
Another weird thing.
String Deposit = new String();
String Withdraw = new String();?I Am fairly new to java, I have things "working" to an extent, and i am aware of the naming conventions over the variable names,

Calling a non-static method from another Class

Hello forum experts:
Please excuse me for my poor Java vocabulary. I am a newbie and requesting for help. So please bear with me! I am listing below the program flow to enable the experts understand the problem and guide me towards a solution.
1. ClassA instantiates ClassB to create an object instance, say ObjB1 that
    populates a JTable.
2. User selects a row in the table and then clicks a button on the icon toolbar
    which is part of UIMenu class.
3. This user action is to invoke a method UpdateDatabase() of object ObjB1. Now I want to call this method from UIMenu class.
(a). I could create a new instance ObjB2 of ClassB and call UpdateDatabase(),
                                  == OR ==
(b). I could declare UpdateDatabase() as static and call this method without
     creating a new instance of ClassB.With option (a), I will be looking at two different object instances.The UpdateDatabase() method manipulates
object specific data.
With option (b), if I declare the method as static, the variables used in the method would also have to be static.
The variables, in which case, would not be object specific.
Is there a way or technique in Java that will allow me to reference the UpdateDatabase() method of the existing
object ObjB1 without requiring me to use static variables? In other words, call non-static methods in a static
way?
Any ideas or thoughts will be of tremendous help. Thanks in advance.

Hello Forum:
Danny_From_Tower, Encephalatic: Thank you both for your responses.
Here is what I have done so far. I have a button called "btnAccept" created in the class MyMenu.
and declared as public.
public class MyMenu {
    public JButton btnAccept;
     //Constructor
     public MyMenu()     {
          btnAccept = new JButton("Accept");
}     I instantiate an object for MyMenu class in the main application class MyApp.
public class MyApp {
     private     MyMenu menu;
     //Constructor
     public MyApp(){
          menu = new MyMenu();
     public void openOrder(){
           MyGUI MyIntFrame = new MyGUI(menu.btnAccept);
}I pass this button all the way down to the class detail02. Now I want to set up a listener for this
button in the class detail02. I am not able to do this.
public class MyGUI {
     private JButton acceptButton;
     private detail02 dtl1 = new detail02(acceptButton);
     //Constructor
     public AppGUI(JButton iButton){
     acceptButton = iButton;
public class detail02{
    private JButton acceptButton;
    //Constructor
    public detail02(JButton iButton){
      acceptButton = iButton;
      acceptButton.addActionListener(new acceptListener());
   //method
    private void acceptListener_actionPerformed(ActionEvent e){
       System.out.println("Menu item [" + e.getActionCommand( ) + "] was pressed.");
    class acceptListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
               acceptListener_actionPerformed(e);
} I am not able to get the button Listener to work. I get NullPointerException at this line
          acceptButton.addActionListener(new acceptListener());in the class detail02.
Is this the right way? Or is there a better way of accomplishing my objective?
Please help. Your inputs are precious! Thank you very much for your time!

Reg - how to find the purpose of methods in a class

hi everyone,
           can u plz help me with how to find the purpose of methods in a class???????
a description abt the methods in a class??????
                    thx in advance,
regards,
balaji.s

Hi Balaji
Pls find some stuff.
reward pts if help.
The following statements define the structure of a class:
·        A class contains components
·        Each component is assigned to a visibility section
·        Classes implement methods
The following sections describe the structure of classes in more detail.
Class Components
The components of a class make up its contents. All components are declared in the declaration part of the class. The components define the attributes of the objects in a class. When you define the class, each component is assigned to one of the three visibility sections, which define the external interface of the class. All of the components of a class are visible within the class. All components are in the same namespace. This means that all components of the class must have names that are unique within the class.
There are two kinds of components in a class - those that exist separately for each object in the class, and those that exist only once for the whole class, regardless of the number of instances. Instance-specific components are known as instance components. Components that are not instance-specific are called static components.
In ABAP Objects, classes can define the following components. Since all components that you can declare in classes can also be declared in interfaces, the following descriptions apply equally to interfaces.
Attributes
Attributes are internal data fields within a class that can have any ABAP data type. The state of an object is determined by the contents of its attributes. One kind of attribute is the reference variable. Reference variables allow you to create and address objects. Reference variables can be defined in classes, allowing you to access objects from within a class.
Instance Attributes
The contents of instance attributes define the instance-specific state of an object. You declare them using the DATAstatement.
Static Attributes
The contents of static attributes define the state of the class that is valid for all instances of the class. Static attributes exist once for each class. You declare them using the CLASS-DATA statement. They are accessible for the entire runtime of the class.
All of the objects in a class can access its static attributes. If you change a static attribute in an object, the change is visible in all other objects in the class.
The technical properties of instance attributes belong to the static properties of a class. It is therefore possible to refer in a LIKE addition to the visible attributes of a class through the class component selector or through reference variables, without prior creation of an object.
Methods
Methods are internal procedures in a class that define the behavior of an object. They can access all of the attributes of a class. This allows them to change the data content of an object. They also have a parameter interface, with which users can supply them with values when calling them, and receive values back from them The private attributes of a class can only be changed by methods in the same class.
The definition and parameter interface of a method is similar to that of function modules. You define a method meth in the definition part of a class and implement it in the implementation part using the following processing block:
METHOD meth.
ENDMETHOD.
You can declare local data types and objects in methods in the same way as in other ABAP procedures (subroutines and function modules). You call methods using the CALL METHOD statement.
Instance Methods
You declare instance methods using the METHODSstatement. They can access all of the attributes of a class, and can trigger all of the events of the class.
Static Methods
You declare static methods using the CLASS-METHODSstatement. They can only access static attributes and trigger static events.
Special Methods
As well as normal methods, which you call using CALL METHOD, there are two special methods called constructor and class_constructor that are automatically called when you create an object or when you first access the components of a class.
reward pts if help.
deepanker

Function Module to open a new session displaying a method of a class

Hello All,
I have a method A of class B.
Now, in my current session, I have a button. When the user clicks on this button, what I expect is that a new session be opened and in the new session method A of class B be displayed.
This is similar to the debugger, wherein, in the debugging mode, we can bring up the context menu in the Source Code (Edit Control) tool, and then select "Go To Source Code".
So basically, I am looking for a Function Module which does the same.
I came across Function Module CC_CALL_TRANSACTION_NEW_TASK, however, this will only create a new session.
I could specify the transaction as SE24, but it then opens a new session with this transaction. That is it.
My objective is to display the method of a class in a new session.
Is there any Function Module in this case?
Regards,
Mithun
Edited by: Mithun Kamath on Aug 9, 2011 5:35 PM

Hello Sandra,
Thank you very much. That was exactly what I was looking for.
However, instead of calling EDITOR_PROGRAM directly, what I instea did was the following:
1) Created a RFC enabled Function module.
2) Inside this function module, I wrote the following code:
SUBMIT tpda_editor_start AND RETURN
   WITH prgm = is_alert_det-program_name
   WITH incl = is_alert_det-include_name
   WITH dynp = space
   WITH line = is_alert_det-line_no.
The parameters above were similar to the one proposed by you.
Borrowed the above from the class CL_TPDA_SERVICES_TOOLS, method NAVIGATE_TO_SOURCE.
The above is basically called in the debugger, when we use the context menu in the editor tool and invoke the "Goto Source Code" functionality. This eventually calls the EDITOR_PROGRAM FM.
The reason why I did this is because when I was testing the FM, it did not allow me to specify the include as CL_TEST=====CM01. I do not know why, probably I was doing it wrong. But it gave me a message saying that the object does not exist in table TADIR.
Anyway, I did the above steps and it worked exactly as I wanted it to.
I would like to thank you again.
Best Regards,
Mithun
P.S. Forgot to add, I called the above RFC enabled FM as a new task.
Edited by: Mithun Kamath on Aug 10, 2011 4:19 PM

"Open method of Workbooks class failed" when opening Excel file via Internet Explorer

(apologies, I posted this first to the general Office 2010 forum, but then realized this was probably a better spot to post)
We have an Excel COM add-in installed on users' PCs. This add-in responds to workbook open events by opening a particular XLA file (also deployed to the PC) to make certain features available. This process works flawlessly when Excel files are
opened locally - but when a user attempts to open an Excel file from an IE link, we get the following error: "Open method of Workbooks class failed". This is happening on the line that is trying to open the XLA file. This only happens
when launching an Excel link from IE - works fine in Chrome or Firefox.
I have found several posts on this topic, but no solutions:
1. This post (https://social.msdn.microsoft.com/forums/office/en-US/73c96005-84af-4648-b103-32b677205be3/open-method-of-workbooks-class-failed)
is the closest to our problem. In this case, the "answer" was that the user may not have access to the 2nd workbook being opened. But in our case, we're opening an XLA that is on the local machine, and I've confirmed that it is not
corrupt and accessible (read & write, just in case!) to Everyone.
2. This (very old) post (http://www.pcreview.co.uk/forums/open-method-workbooks-fails-excel-hosted-ie-t965608.html)
seems similar, but is talking about opening Excel inside of IE. This is not what we're doing - the link is supposed to (and does) open Excel outside of IE. Interestingly, Excel.exe is being launched with the "-embedded" flag, even
though it isn't running in the IE window. When launching Excel by opening the file locally, Excel.exe is run with the "/dde" flag instead. Clearly the "-embedded" mode is what is causing the problem. I could change the
links on the web page to use some JavaScript to open Excel differently... unfortunately, the links are actually generated by SharePoint (the Excel files are in a SP repository), so this is not really an option.
3. This Microsoft KB article (http://support.microsoft.com/kb/268016) talks about problems opening an XLA directly from IE... but this is the case of a link pointing
directly to an XLA file, not opening a regular workbook that in turn opens an XLA, as is my case. In fact, this article specifically points out in the "More Information" section that "End users do not normally open XLAs; instead they open
an XLS that (if needed) loads one or more XLAs during startup." ==> precisely what I'm trying to do that is giving me the error!
I've replicated the situation with a very simple COM add-in (created in VS2010 using VB.Net) and a very simple XLA file (does nothing, just pops up a message in auto_open). For anyone wanting to try it out, here is the exact test case:
1. In Excel, create a simple XLA file containing only the following code, and save it in C:\TEMP\dummy.xla:
Sub Auto_Open()
MsgBox "Auto Open fired"
End Sub
2. In Visual Studio, create a new Excel 2010 Add-In. I created mine via Visual Basic, but I doubt the choice of language matters. Place the following code in ThisAddin.vb:
Public Class ThisAddIn
Private Sub ThisAddIn_Startup(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Startup
AddHandler Me.Application.WorkbookOpen, AddressOf Application_WorkbookOpen
End Sub
Private Sub ThisAddIn_Shutdown(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Shutdown
End Sub
Sub Application_WorkbookOpen(ByVal workbook As Excel.Workbook)
On Error GoTo ErrHandler
If (Not workbook.Name.Contains("dummy.xla")) Then
MsgBox("Workbook open")
Application.Workbooks.Open("C:\temp\dummy.xla")
Application.Workbooks("dummy.xla").RunAutoMacros(Excel.XlRunAutoMacro.xlAutoOpen)
End If
Exit Sub
ErrHandler:
MsgBox(Err.Description)
End Sub
End Class
3. Build & publish this add-in and install it on the same machine as the XLA created in step 1.
4. Create and save an empty Excel workbook (I called mine WayneTest1.xlsx) - save it locally (on your desktop), and put a copy somewhere on your web server (I put mine directly in c:\inetpub).
5. Create an HTML file with a link to that workbook, saving it to the same web server location - here is mine:
<html>
<body>
<a href="WayneTest1.xlsx">Link to Excel file</a>
</body>
</html>
6. Double click the workbook on your desktop (from step 4) - opens fine, I get the "workbook open" message, following by the "Auto Open fired" message.
7. In Internet Explorer, navigate to the HTML file specified in step 5 and click on the link - when prompted, select "Open" - I get the "workbook open" message, following by the error message "Open method of Workbooks class failed".
Here are a few things I've ruled out / tried so far:
- Unchecked all the "Protected View" settings in Excel, made no difference
- Unchecked all the "File block settings" in Excel, made no difference
- Made sure dummy.xla was open for read & write to Everyone
- Made sure the web page was in Trusted sites and set the security level to Low for those sites in IE
- Tried making the local desktop file (step 6) readonly, made no difference (i.e. launching it locally still worked fine)
- Tried using Excel 2013 - made no difference
Any ideas / suggestions?

Hello Wayne,
Apologies for the delay.
I went through your post and tried to reproduce the issue. I was able to reproduce it. Based
on its complexity and as it requires more in-depth analysis, your question falls into the paid support category which requires a more in-depth level of support.
Please visit the below link to see the various paid support options that are
available to better meet your needs. http://support.microsoft.com/default.aspx?id=fh;en-us;offerprophone
Thanks,
Anush

Error in using method get_event of class cl_htmlb_manager.

Hi All,
i am trying to get the event details in a particular method as follows;
data: event type ref to cl_htmlb_event .
event = cl_htmlb_manager=>get_event( runtime-> server- >request ).
i am getting an error
field RUNTIME is unknown , it is neither in one of the specified tables nor defined by DATA statement. DATA statement. DATA statement.
Where am i going wrong?
plz help.
BR,
Annu.

Hi Jorge,
I am trying to use it in the method GET_LIST of class CL_SUS_M_ORDER_LIST .
If i use
event = cl_htmlb_manager=>get_event_ex( request ).
again i get the error Field REQUEST is unknown .
and if i dont declare event using data statement
data: event type ref to cl_htmlb_event .
then i get the error that Field EVENT is unknown.
My application is MVC pattern.
So is there anyother way of geting the EVENT details when RUNTIME / REQUEST are not available ?
Thaknks for the reply.

Calling a servlet method from another class

hi...
if i make a servlet (that keeps the log for website users' logins and logouts, for example) and i want a method that adds an entry into a logfile, for example:
public void log(String line) {
//put "line" into some log file...
and then i set this servlet to loadonstartup, how can i call the log() function from other classes or servlets? can i do it without making the servlet an entry in servletContext?
im sorry if i'm not being very clear, the caffeine's getting to me...
thanks
lazlo

I don't know, why would you do that anyway? Just make an ordinary class, not a servlet, and make "log" a static method in that class. (If you need initialization, use a static initializer.) Put that class where the real servlet can see it and call it from there.

To access a method frm a class derived frm a base class with the same name

Here' s an example:-
class TestA {
public void start() {
System.out.println("TestA");
class TestB extends TestA {
public void start() {
System.out.println("TestB");
}In main method I do this:-
TestA testA = new TestA();
TestB testB = new TestB();
((TestA)testB).start();Output :-
TestB.
Now when i define the method as static :-
class TestA {
public static void start() {
System.out.println("TestA");
class TestB extends TestA {
public static void start() {
System.out.println("TestB");
}Then output is :-
TestA.
Can anyone let me know that when i say ((TestA)testB).start(); i.e i am type casting TestB obect to it base call then TestA should be printed but it doesn't print but when i declare method as static is does print TestA.
Thanks,
Heena

>
>
Secondly, when i say ((TestA).testB).start(); output is TestB. But when i define start() method as static output is TestA. I need clarity for the same.In the static case, all that the compiler is interested in is the class of the expression before the ".". Because you've put in an explicit cast the type of expression is assumed to be TestA the compiler doesn't know what kind of object will actually be referenced at runtime. In the static case which method is called is determined at compile time.
In the instance method case what determines the method called is determined the class of the actual, run time, value of the expression, and despite your cast, the actual value is still a reference to a TestB instance, so the TestB method is called. In the instance case which method called is determined at run time.

Issue with CHECK_CHANGED_DATA method of CL_GUI_ALV_GRID class

HI,
I want to check whether my grid has any changes or not, for that i am using the CHECK_CHANGED_DATA method of CL_GUI_ALV_GRID class,
What i am doing is.... I am doing some changes in my grid data and clicking on SAVE . This time CHECK_CHANGED_DATA is saying the grid have changes ,and i am displaying a pop up whether to save the changes or not. And i am saving changes.
Till now Fine.
If i click on SAVE again CHECK_CHANGED_DATA is showing again the Grid has changes.
So how can i solve this problem.
Thanks in advance.

Hello Narendra
If you do not need to do any validations of the changed ALV list data then you can use a very simple approach which does not even require an event handler for event DATA_CHANGED.
The crucial part of the coding is shown below, followed by the entire sample report ZUS_SDN_ALV_EDITABLE_1A. Basically, the ALV list is stored as a "PBO" image of the data (GT_OUTTAB_PBO). And only if the user changed the data (i.e. GT_OUTTAB_PBO <> GT_OUTTAB) the save option including the popup is executed.
*&      Module USER_COMMAND_0100 INPUT
*       text
MODULE user_command_0100 INPUT.
" NOTE: retrieve changed data from frontend (grid control) into
"       the backend (itab in ABAP)
go_grid->check_changed_data( ).
CASE gd_okcode.
    WHEN 'BACK' OR
         'EXIT' OR
         'CANC'.
      SET SCREEN 0. LEAVE SCREEN.
    WHEN 'SAVE'.
      IF ( gt_outtab = gt_outtab_pbo ).
        MESSAGE 'No data changed' TYPE 'S'.
      ELSE.
        CLEAR: gd_answer.
        CALL FUNCTION 'POPUP_TO_CONFIRM'
          EXPORTING
*             TITLEBAR                    = ' '
*             DIAGNOSE_OBJECT             = ' '
            text_question               = 'Save data?'
          IMPORTING
            answer                      = gd_answer
*           TABLES
*             PARAMETER                   =
          EXCEPTIONS
            text_not_found              = 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.
        IF ( gd_answer = '1' ). " yes
          MESSAGE 'Data successfully saved' TYPE 'S'.
          gt_outtab_pbo = gt_outtab. " update PBO data !!!
        ELSE.
          MESSAGE 'Action cancelled by user' TYPE 'S'.
        ENDIF.
      ENDIF.
    WHEN OTHERS.
ENDCASE.
CLEAR: gd_okcode.
ENDMODULE.                 " USER_COMMAND_0100 INPUT
*& Report ZUS_SDN_ALV_EDITABLE
* Flow logic of screen '100' (no elements, ok-code => gd_okcode ):
**PROCESS BEFORE OUTPUT.
** MODULE STATUS_0100.
**PROCESS AFTER INPUT.
** MODULE USER_COMMAND_0100.
REPORT zus_sdn_alv_editable_1a.
TYPE-POOLS: abap.
CONSTANTS:
gc_tabname       TYPE tabname VALUE 'KNB1'.
TYPES: BEGIN OF ty_s_outtab.
INCLUDE TYPE knb1.
TYPES: END OF ty_s_outtab.
TYPES: ty_t_outtab    TYPE STANDARD TABLE OF ty_s_outtab
                      WITH DEFAULT KEY.
DATA:
gd_okcode        TYPE ui_func,
gd_repid         TYPE syst-repid,
gt_fcat          TYPE lvc_t_fcat,
gs_layout        TYPE lvc_s_layo,
gs_variant       TYPE disvariant,
go_docking       TYPE REF TO cl_gui_docking_container,
go_grid          TYPE REF TO cl_gui_alv_grid.
DATA:
gs_outtab        TYPE ty_s_outtab,
gt_outtab        TYPE ty_t_outtab,
gt_outtab_pbo    TYPE ty_t_outtab.
DATA:
gd_answer        TYPE c.
START-OF-SELECTION.
SELECT * FROM (gc_tabname) INTO TABLE gt_outtab UP TO 99 ROWS.
gt_outtab_pbo = gt_outtab. " set PBO data
PERFORM init_controls.
* ok-code field = GD_OKCODE
CALL SCREEN '0100'.
END-OF-SELECTION.
*&      Form INIT_CONTROLS
*       text
* --> p1        text
* <-- p2        text
FORM init_controls .
* Create docking container
CREATE OBJECT go_docking
    EXPORTING
      parent = cl_gui_container=>screen0
      ratio = 90
    EXCEPTIONS
      OTHERS = 6.
IF sy-subrc <> 0.
*   MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*              WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
* Create ALV grid
CREATE OBJECT go_grid
    EXPORTING
      i_parent = go_docking
    EXCEPTIONS
      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.
" NOTE: not required
* set handler:
*    lcl_eventhandler=>handle_data_changed for go_grid.
* Build fieldcatalog and set hotspot for field KUNNR
PERFORM build_fieldcatalog.
PERFORM set_layout_and_variant.
* Display data
CALL METHOD go_grid->set_table_for_first_display
    EXPORTING
      is_layout       = gs_layout
      is_variant      = gs_variant
      i_save          = 'A'
    CHANGING
      it_outtab       = gt_outtab
      it_fieldcatalog = gt_fcat
    EXCEPTIONS
      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.
* NOTE:
* Documenation of I_SAVE ("An Easy Reference for ALV Grid Control")
*I_SAVE
*Determines the options available to the user for saving a layout:
*? 'X': global saving only
*? 'U': user-specific saving only
*? 'A': corresponds to 'X' and 'U'
*? SPACE: no saving
* Link the docking container to the target dynpro
gd_repid = syst-repid.
CALL METHOD go_docking->link
    EXPORTING
      repid                       = gd_repid
      dynnr                       = '0100'
*      CONTAINER                   =
    EXCEPTIONS
      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.
ENDFORM.                    " INIT_CONTROLS
*&      Module STATUS_0100 OUTPUT
*       text
MODULE status_0100 OUTPUT.
SET PF-STATUS 'STATUS_0100'.
* SET TITLEBAR 'xxx'.
ENDMODULE.                 " STATUS_0100 OUTPUT
*&      Module USER_COMMAND_0100 INPUT
*       text
MODULE user_command_0100 INPUT.
" NOTE: retrieve changed data from frontend (grid control) into
"       the backend (itab in ABAP)
go_grid->check_changed_data( ).
CASE gd_okcode.
    WHEN 'BACK' OR
         'EXIT' OR
         'CANC'.
      SET SCREEN 0. LEAVE SCREEN.
    WHEN 'SAVE'.
      IF ( gt_outtab = gt_outtab_pbo ).
        MESSAGE 'No data changed' TYPE 'S'.
      ELSE.
        CLEAR: gd_answer.
        CALL FUNCTION 'POPUP_TO_CONFIRM'
          EXPORTING
*             TITLEBAR                    = ' '
*             DIAGNOSE_OBJECT             = ' '
            text_question               = 'Save data?'
*             TEXT_BUTTON_1               = 'Ja'(001)
*             ICON_BUTTON_1               = ' '
*             TEXT_BUTTON_2               = 'Nein'(002)
*             ICON_BUTTON_2               = ' '
*             DEFAULT_BUTTON              = '1'
*             DISPLAY_CANCEL_BUTTON       = 'X'
*             USERDEFINED_F1_HELP         = ' '
*             START_COLUMN                = 25
*             START_ROW                   = 6
*             POPUP_TYPE                  =
*             IV_QUICKINFO_BUTTON_1       = ' '
*             IV_QUICKINFO_BUTTON_2       = ' '
          IMPORTING
            answer                      = gd_answer
*           TABLES
*             PARAMETER                   =
          EXCEPTIONS
            text_not_found              = 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.
*         Triggers PAI of the dynpro with the specified ok-code
        IF ( gd_answer = '1' ). " yes
          MESSAGE 'Data successfully saved' TYPE 'S'.
          gt_outtab_pbo = gt_outtab. " update PBO data !!!
        ELSE.
          MESSAGE 'Action cancelled by user' TYPE 'S'.
        ENDIF.
      ENDIF.
    WHEN OTHERS.
ENDCASE.
CLEAR: gd_okcode.
ENDMODULE.                 " USER_COMMAND_0100 INPUT
*&      Form BUILD_FIELDCATALOG
*       text
* --> p1        text
* <-- p2        text
FORM build_fieldcatalog .
* define local data
DATA:
    ls_fcat        TYPE lvc_s_fcat.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
*     I_BUFFER_ACTIVE              =
      i_structure_name             = gc_tabname
*     I_CLIENT_NEVER_DISPLAY       = 'X'
*     I_BYPASSING_BUFFER           =
*     I_INTERNAL_TABNAME           =
    CHANGING
      ct_fieldcat                  = gt_fcat
    EXCEPTIONS
      inconsistent_interface       = 1
      program_error                = 2
      OTHERS                       = 3.
IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ls_fcat-edit = abap_true.
MODIFY gt_fcat FROM ls_fcat
      TRANSPORTING edit
    WHERE ( key NE abap_true ).
ENDFORM.                    " BUILD_FIELDCATALOG
*&      Form SET_LAYOUT_AND_VARIANT
*       text
* --> p1        text
* <-- p2        text
FORM set_layout_and_variant .
CLEAR: gs_layout,
         gs_variant.
gs_layout-cwidth_opt = abap_true.
gs_layout-zebra      = abap_true.
gs_variant-report = syst-repid.
gs_variant-handle = 'GRID'.
ENDFORM.                    " SET_LAYOUT_AND_VARIANT
Regards
Uwe

Help me, calling a method in another class.

public class xxx extends thread{
User aUser=new User("MARY") //create an object in the User class
aUser.SendToOnlineList(); // i want to use the SendToOnlineList() method to call the AddToList() method which is in the OnlineList class
OnlineList.ReturnList();   // and then i want to get back the online list by using the method ReturnList() in the class OnlineList.
class User {
      private final String userId;
    public User(String userId) { //constructor
        this.userId = userId;
public void SendToOnlineList () {
    OnlineList.ServerOnlineList.AddToList(this); // netbeans underlines this statement!!!!!!!!can anybody help me with codes?
class OnlineList {
   ArrayList ServerOnlineList=new ArrayList();
   public void AddToList(User user) {
       ServerOnlineList.add(user); // I want to add a User object into the ServerOnlineList( this is an arraylist) in this class
public ArrayList ReturnList () {
return ServerOnlineList;
}can you help me???thanks!!!!!!!!!!!!!!

@OP: You need to stop this.
You don't grasp even the basics of Java, and you're trying to write a client/server app. That is not reasonable. If you don't understand how to initialize a variable or how to print things out or what public means, or how to debug your own NullPointerExceptions, or any of a host of other basics that seem to stump you, then you're in way over your head.
It doesn't matter if you "have to" do this because it's an assignment for school. Posting a new thread here for each of the 80 bazillion things you don't undertsand will not help you to learn, and it's getting very annoying.
If you really want to learn Java, then go through one of more of the following.
Sun's basic Java tutorial
Sun's New To Java Center. Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
http://javaalmanac.com. A couple dozen code examples that supplement The Java Developers Almanac.
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's Thinking in Java (Available online.)
Joshua Bloch's Effective Java
Bert Bates and Kathy Sierra's Head First Java.

How to declare ftp in File class. I want to display filename of file in FTP

How to declare ftp in File class. I want to display filename of file in FTP server.
I try
File f2= new File("ftp://abc:abc1111@ABC/file");
               String n[] = f2.list();
               System.out.print(n[0]);
               Vector filename = null ;
               for (int i2 = 0; i2 < n.length; i2++) {
                    filename.add(n[i2]);
but it is not work
Thank you.

You can use Jakarta's net-package to connect to a FTP server.
Download it here:
http://jakarta.apache.org/site/downloads/downloads_commons-net.cgi
Here's a small demo:
import org.apache.commons.net.ftp.*;
public class FTPTest {
    private boolean isConnected;
    private FTPClient client;
    public FTPTest() {
        isConnected = false;
        connect();
    private void connect() {
        String server = "server.org";
        String username = "user";
        String password = "password";
        client = new FTPClient();
        try {
            client.connect(server);
            client.login(username, password);
            String[] files = client.listNames();
            for(int i = 0; i < files.length; i++) {
                System.out.println(files);
isConnected = true;
disconnect();
catch(Exception e) {
e.printStackTrace();
private void disconnect() {
if(isConnected) {
try {
client.disconnect();
isConnected = false;
catch(Exception e) {
e.printStackTrace();
public static void main(String[] args) {
new FTPTest();

Declaration method in users Class

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