How to call a method of a base class if the base class is abstract...

This is my sample code>>>>
abstract class b {
     public void display() {
          System.out.println("I am in Base Class");
class test extends b {
     public static void main(String[] args) {
          test obj = new test();
          obj.display();
     public void display() {
          System.out.println("I am in Derived Class");
I want to call base class version of display with derived class object.........is it possible....

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//This Works 1
-(void)addCard:(MyiCards *)card{
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//This works 2
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I have tried tons of stuff here, but nothing is working. When i build this I get no errors or warnings, but trying to call the method in anyway other that what is there, i get errors.

Can you explain more about what you are trying to do? IBAction is just a 'hint' to Interface Builder. It's just a void method return. And it's unclear what method is where from your code snippet below. is addNewCard: in another class? And if so, does it have a reference to the 'card' object you are sending the 'insertNewCardIntoDatabase' message? Some more details would help.
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How to call a method of an other view in the current view

Hi Guys,
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Hi,
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Hi guys
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Hi all,
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Message was edited by:
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How to Call a method from a separate class...?

Hi there...
I have a class name HMSCon which has a method named con...
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here's my code:
public class HMSCon{
public static void con(){
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=" +
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Connection cn = DriverManager.getConnection(url,"Admin", "asian01");
}catch(Exception s){
System.err.print(s);}
here's my seperate class file TAQueries,i put an error message below..
class TAInfoQueries{
public void insertNewTA(String TAID,String Fname,String Mname, String Lname,String Age,
String Bdate,String Haddress,String ContactNo){
// Statement stmt=cn.createStatement(); ERROR: Cannot find symbol cn.
// stmt.executeUpdate("INSERT INTO TechnicalAssistants VALUES('sdfas','sdfsdf','sdfdsf','sdfdsf',3,04/13/04,'asdf','asdfsdf')");
// stmt.close();
}

You can try the below code, but it's a bad idea to use staitc member for connection:(
public class HMSCon{
static Connection cn;
static{
con();
public static void con(){
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url="jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=" +
"E:/samer/HardwareMonitoringSystem/src/hms/pkg/hmsData.mdb";
cn = DriverManager.getConnection(url,"Admin", "asian01");
}catch(Exception s){
System.err.print(s);}
here's my seperate class file TAQueries,i put an error message below..
class TAInfoQueries{
public void insertNewTA(String TAID,String Fname,String Mname, String Lname,String Age,
String Bdate,String Haddress,String ContactNo){
// Statement stmt=HMSCon.cn.createStatement(); ERROR: Cannot find symbol cn.
// stmt.executeUpdate("INSERT INTO TechnicalAssistants VALUES('sdfas','sdfsdf','sdfdsf','sdfdsf',3,04/13/04,'asdf','asdfsdf')");
// stmt.close();
}

How to call a method in private section of a class in the public section

Hi Everybody,
i have written a method(meth1) in the private section of a class(C1).
it is as follows
class C1 definition.
private section.
methods: meth1 importing im_dt1 like tp1
                                         im_dt2 like tp2
                                         im_dt3 like tp3
                                         im_dt4 like tp4
                           returning value(re_dt1) like tp5.
endclass.
i have the final data that has to be displayed in internal table re_dt1.
now my question is how to call this method present in private section into public section and display the data present in re_dt1.
Thanks,
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Hi,
what you need is one public method being called at start-of-selection. Within this the private methods have to be called.
The question is, why has the method for reading the database tables to be private? If you have only one private method reading all database tables the public method being called at start-of-selection will only consist of a call-method statement.
This seems to be one call to much.
The logic for reading the different database tables is hidden inside the class anyway.
Is there any further logic reading the different database tables?
Have always all table to be read? If not another approach would be one private method for each database table being called by a public method deciding which table has to be read:
public section.
methods get_data returning value(re_Dt1).
private section.
methods:
get_table_a returning value(im_dt1),
get_table_b returning value(im_dt2),
get_table_c returning value(im_dt3),
get_table_d returning value(im_dt4),
combine_data importing im_dt1
                                im_dt2
                                im_dt3
                                im_dt4
                        returning value(re_dt1).
*- implementation of public method:
method get_data.
data: lt_dt1 ...
           lt_dt2,
           lt_dt3,
           lt_dt4.
* here decide which tables have to be read:
lt_dt1 = get_table_a( ).
lt_dt2 = get_table_b( ).
lt_dt3 = get_table_c( ).
lt_dt4 = get_table_d( ).
re_dt1 = combine_data( i_dt1 = lt_dt1
                                       i_dt2 = lt_dt2
                                       i_dt3 = lt_dt3
                                       i_dt4 = lt_dt4 ).
endmethod.
*- implementation of private methods
method get_table_a.
endmethod.
method get_table_b.
endmethod.
method get_table_c.
endmethod.
method get_table_d.
endmethod.
method combine_data.
endmethod.
Regards
Dirk

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Hello,
I am very new to the ABAP world. I have been given a task to call a method if_hrbas_plain_infotype_access~read_single from the class CL_HRBAS_PLAIN_INFOTYPE_ACCESS in a program to see if we can use it to display some employee information. I don't know how to call a method in a program. Can somebody please provide me some pseudo code or instructions?
Thanks.

Hi Shan,
here is the code to call a method. while calling the method Instance as 'r_info' which is the type reference to class as specified.
pass the values to exporting parameters plvar,otype,objid...etc according to the requirement
infotypes: 0002.   " creates an internal table p0002.
data:
r_info type ref to CL_HRBAS_PLAIN_INFOTYPE_ACCESS.
TRY.
CALL METHOD r_info->if_hrbas_plain_infotype_access~read
   EXPORTING
     plvar           =
     otype           =
     objid           =
     istat           =
     infty           =
*     SUBTY           =
     begda           =
     endda           =
     no_auth_check   = 'X'
     message_handler =
   IMPORTING
     PNNNN_TAB       = P0002
*     HRTNNNN_TAB     =
*     IS_OK           =
CATCH CX_HRBAS_VIOLATED_ASSERTION .
ENDTRY.
LOOP AT P0002.
      WRITE:/
        P0002-VORNA,
        P0002-NCHMC,
        P0002-NACHN.
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Regards

How to call a method defined in AM when I select any value in LOV

Lets say there is a LOV. The scenario is as soon as I select any value in LOV, a method needs to be called which I have written in the AM. And the output of the method is displayed in a output text box.
I am not able to understand how to call a method when the user selects any value in LOV.
This is wht I did. I had created the binding for the method. Changed the autosubmit property of the LOV to True, and in the properties of the output box, in the partial submit trigger property, passed the ID of the LOV. But I didnt get any place where I need to call the method. I am also not able to drop an action listener on the LOV

Hi,
+"its showing an error(underlined in orange)."+
Any reason you don't share this error with us? Anyway, here is how it goes
1. LOV, set autosubmit="true" and configure a value change listener
2. Expose the AM method as a method binding in the PageDef file
3. In the value change listener:
BindingContext bctx = BindingContxt().getCurrent();
BindingContainer bindings = bctx.getCurrentBindingsEntry();
OperationBinding method = (OperationBinding) bindings.get("name of method binding in PageDef");
method.getParamsMap().put("argument name1", value1);
method.getParamsMap().put("argument name2", value2);
Object retVal = method.execute();
if(!method.getErrors().isEmpty()){
//handle errors
else{
//write retVal to the managed bean variable that is referenced by the outputText value property
//PPR output text component
ADFFacesContext.getCurrentInstance().addPartialTarget(outputTextRef);
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Frank

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I want to get the data for the applet from the servlet.
How to call a method that exits in the servlet from the applet? I want to use http protocol to do this.
Any suggestions? Please help.
thanks

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Suppose i have a code like this
class Demo
public static void main(String args[])
System.out.println("We are in First class");
class Demo1
public static void main(String args[])
System.out.println("We are in second class");
In the above program how to call main method in demo calss from Demo1 class......???????

No, i dont know how to call other than main methods from other classes
And one more doubt i have i.e. Like in C can we see the execution of the program like how the code is being compiled step by step and how the value of the variable changes from step to step like(Add Watch).........

How to call a method of another class ?

Hello,
I�d like to know how to call a method of another class. I have to classes (class 1 and class 2), class 1 instantiates an object of class 2 and executes the rest of the method. Later, class 1 has to call a method of class 2, sending a message to do something in the object... Does anybody know how to do that ? Do I have to use interface ? Could you please help me ?
Thanks.
Bruno.

Hi Schiller,
The codes are the following:
COMECO
import javax.swing.UIManager;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.awt.event.*;
import javax.swing.*;
//Main method
class comeco {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
catch(Exception e) {
AGORA testeagora=new AGORA();
// Code for socket
int port;
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     BufferedReader input;
     try {
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     catch (Exception e) {
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     port = 1500;
     try {
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     while(true) {
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          System.out.println("comeco ---> New connection accepted " +
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testeagora.teste(message);
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          try {
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          catch (IOException e) {
          System.out.println(e);
     catch (IOException e) {
     System.out.println(e);
AGORA
import javax.swing.UIManager;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import javax.swing.*;
import java.net.*;
//public class AGORA {
public class AGORA {
boolean packFrame = false;
//Construct the application
public AGORA() {
try {
Main frame = new Main();
System.out.println("agora ---> Criou o frame");
//Validate frames that have preset sizes
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if (packFrame)
frame.pack();
else
frame.validate();
//Center the window
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height)
frameSize.height = screenSize.height;
if (frameSize.width > screenSize.width)
frameSize.width = screenSize.width;
frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
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{ System.out.println("agora ---> " +e);
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public void remontar (final String msg) {
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Main.acao(msg);
catch(Exception x) {
x.printStackTrace();
MAIN
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import javax.swing.border.*;
import java.net.*;
import java.io.*;
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try {
jbInit();
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// C�digo para mudar a interface
Runnable setTextRun=new Runnable() {
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String espaco=new String(": ");
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//Help | About action performed
public void helpAbout_actionPerformed(ActionEvent e) {
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Dimension dlgSize = dlg.getPreferredSize();
Dimension frmSize = getSize();
Point loc = getLocation();
dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x, (frmSize.height - dlgSize.height) / 2 + loc.y);
dlg.setModal(true);
dlg.show();
//Overridden so we can exit on System Close
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if(e.getID() == WindowEvent.WINDOW_CLOSING) {
fileExit_actionPerformed(null);
public void result(final String msg) {
// C�digo para mudar a interface
Runnable setTextRun=new Runnable() {
public void run() {
try {
               System.out.println("main ---> Chamou o m�todo result para mudar a interface");
System.out.println("main --> Mensagem que veio do agora para main: "+ msg);
TStatus.setText(msg);
catch(Exception x) {
x.printStackTrace();
System.out.println("main --> About to invokelater");
SwingUtilities.invokeLater(setTextRun);
System.out.println("main --> Back from invokelater");
[]�s.

How to call a method of one view in other view

Hi
could any one suggest "how to call a method of one view in other view "
thanks
kaushik

Hi Kausic,
Its not possible to call a method from view to View.
Since view is private entity we can not pass the data directly.
I suggest you to declare the method in Component/Custom controller and call.
the code is,
wdThis.wdGet<Component/Custom Name>Controller().<methodName>();
Regards,
<b>Ramganesan K</b>

How to call a method in onload using jsf

Hi
i have task where i neeed to retrive datas from database on page onload . i have written retriving code in backing bean but how to call that
method on onload in jsf.......
Can anybody help ???????????
thanks

public class firstbean{
     list mylist = new ArrayList();
     firstbean(){
     new firstcontroller().retriveData()
public class firstcontroller{
     public void retriveData(){
          // I need to get first bean object reference to assign the retived data to my list variable(mylist)
          // but iam getting first bean object object as nulll
          Object object =
               FacesContext
               .getCurrentInstance()
               .getExternalContext()
               .getSessionMap()
               .get("FirstBean");
          FirstBean firstBean = (FirstBean)object;
          // firstBean = null its coming
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this is my code how to implement the onload function in this login . here when i try accesss my first bean reference is showing as null . so aim not able to assign the retrived data in to mylist variable

How to call a method

Hello Every1,
   I have created a implementaion for some definition.
Now I need to call a method from the implemenation in my program. Let me know how to call it?
Regards,
Siva.

Hai
Go through the following Code
*& Report ZABAPOBJECTS_01                                     *
report ZABAPOBJECTS_01                 .
parameter : p_matnr like mara-matnr.
      CLASS lcl_material DEFINITION
class lcl_material definition.
public section.
    data: v_matnr type mara-matnr.
    methods : constructor importing matnr type mara-matnr,
              get_material_description.
private section.
    data : v_maktx type makt-maktx.
endclass.                    "lcl_material DEFINITION
      CLASS lcl_material IMPLEMENTATION
class lcl_material implementation.
method get_material_description.
    clear v_maktx.
    select single maktx into v_maktx
                        from makt
                        where matnr = v_matnr and
                              spras = 'E'.
endmethod.                    "get_material_description
method constructor.
    clear v_matnr.
    v_matnr = matnr.
endmethod.                    "constructor
endclass.                    "lcl_material IMPLEMENTATION
data : obj type ref to lcl_material.
start-of-selection.
create object obj exporting matnr = p_matnr.
call method obj->get_material_description.
Thanks & regards
Sreenivasulu P

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