Can I substitute one class for another at run time

In one compilation unit, there are 2 classes. One is public.(class Test is public and class Process is without any modifier. Test is inherited from Process). There is a private method in Process. When i try to compile while accessing the private method of Process in Test, I get a compiler error, rightfully so. But I successfully got a Process.class.
So, now i remove the private access modifier from my method in Process class and compile the whole thing and am able to run (java Test). But, if i replace the latest Process.class with the original Process class with the private method, I am still able to run(java Test)!!
This all happed in Windows NT but not in Solaris.
Is this correct ? Is this not a security violation?

It's a bug: http://developer.java.sun.com/developer/bugParade/bugs/4293149.html

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How to exchange one image for another with a click

I am brand new to actionscript, so bear with me! I need to create an interactive web-based system which takes the user through steps to assemble something. One of the pages will have images of the tools needed. I want the user to be able to 'tick' off each tool, so that when they click on the image of a specific tool it is replaced by the image faded out and a big red tick over it. essentially it is replacing one image for another when it is clicked on.
any ideas on the actionscript? Sorry i know this must be basic stuff for you!
thanks!

your tool images should be converted to movieclips and given instance names and you should create a red tick movieclip that you assign a class, say RedTick. you can then use:
tool1.addEventListener(MouseEvent.CLICK,toolClickF);
function toolClickF(e:MouseEvent):void{
var redtick:RedTick=new RedTick();
addChild(redtick);
redtick.x=e.currentTarget.x;
redtick.y=e.currentTarget.y;
e.currentTarget.alpha=.4;

How to pass a variable from one class to another class?

Hi,
Is it possible to pass a variable from one class to another? For e.g., I need the value of int a for calculation purpose in method doB() but I get an error <identifier> expected. What does the error mean? I know, it's a very, very simple question but once I learn this, I promise to remember it forever. Thank you.
class A {
int a;
int doA() {
      a = a + 1;
      return a;
class B {
int b;
A r = new A();
r.a; // error: <identifier> expected. What does that mean ?
int doB() {
     int c = b/a; // error: operator / cannot be applied to a
}Thank you!

elaine_g wrote:
I am wondering why does (r.a) give an error outside the method? What's the reason it only works when used inside the (b/r.a) maths function? This is illegal syntax:
class B {
int b;
A r = new A();
r.a; //syntax error
}Why? Class definition restricts what you can define within a class to a few things:
class X {
    Y y = new Y(); //defining a field -- okay
    public X() { //defining a constructor -- okay
    void f() { //defining a method -- okay
}... and a few other things, but you can't just write "r.a" there. It also makes no sense -- that expression by itself just accesses a field and does nothing with it -- why bother?
This is also illegal syntax:
int doB() {
      A r = new A();
      r.a; // error: not a statement
}Again, all "r.a" does on its own is access a field and do nothing with it -- a "noop". Since it has no effect, writing this indicates confusion on the part of the coder, so it classified as a syntax error. There is no reason to write that.

Calling a drawLine() from one class to another from an ActionEvent

I have several JPanel objects called and placed on a JFrame. The JFrame has a RadioButton group with radio buttons. If I select a radio button and call a drawLine() method from a JPanel, I receive a "NullPointerException". Is it not possible to call this graphic method from one class to another?
Thanks for any input you can provide.
John

Remember that each panel draws it's own current state. So you need the ActionPerformed to change the state in your target panel.
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.*;
public class PanelComm extends JPanel {
private SubPanelOne subPanelOne = new SubPanelOne();
private SubPanelTwo subPanelTwo = new SubPanelTwo();
public class SubPanelOne extends JPanel {
    public SubPanelOne () {
      setLayout ( new BorderLayout() );
      setBorder ( BorderFactory.createTitledBorder ( "SubPanel One" ) );
      Reactor     reactor    = new Reactor();
      ButtonGroup group      = new ButtonGroup();
      JPanel      radioPanel = new JPanel(new GridLayout(0, 1));
      JRadioButton buttonOne = new JRadioButton ( "One" );
      buttonOne.addActionListener ( reactor );
      group.add ( buttonOne );
      radioPanel.add ( buttonOne );
      JRadioButton buttonTwo = new JRadioButton ( "Two" );
      buttonTwo.addActionListener ( reactor );
      group.add ( buttonTwo );
      radioPanel.add ( buttonTwo );
      JRadioButton buttonThree = new JRadioButton ( "Three" );
      buttonThree.addActionListener ( reactor );
      group.add ( buttonThree );
      radioPanel.add ( buttonThree );
      add ( radioPanel ,BorderLayout.LINE_START );
    protected void paintComponent ( Graphics _g ) {
      super.paintComponent ( _g );
      Graphics2D g = (Graphics2D)_g;
      g.setRenderingHint ( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
public class SubPanelTwo extends JPanel {
    private JLabel text = new JLabel();
    public SubPanelTwo () {
      setLayout ( new BorderLayout() );
      setBorder ( BorderFactory.createTitledBorder ( "SubPanel Two" ) );
      text.setFont ( new Font ( "Verdana" ,Font.PLAIN ,30 ) );
      text.setHorizontalAlignment ( JLabel.CENTER );
      add ( text ,BorderLayout.CENTER );
    protected void paintComponent ( Graphics _g ) {
      super.paintComponent ( _g );
      Graphics2D g = (Graphics2D)_g;
      g.setRenderingHint ( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );
    public void setChoice ( String cmd ) {
      text.setText ( cmd );
public class Reactor implements ActionListener {
    public void actionPerformed ( ActionEvent e ) {
      subPanelTwo.setChoice ( e.getActionCommand() );
public PanelComm () {
    setLayout ( new GridLayout ( 1 ,2 ) );
    add ( subPanelOne );
    add ( subPanelTwo );
// main
public static void main ( String[] args ) {
    JFrame f = new JFrame ( "Panel Communication" );
    f.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE );
    f.getContentPane().add ( new PanelComm() ,BorderLayout.CENTER );
    f.setSize ( 320 ,120 );
    f.setVisible ( true );
} // main
}

Moving a method from one class to another issues

Hi, im new. Let me explain what i am trying to achieve. I am basically trying to move a method from one class to another in order to refactor the code. However every time i do, the program stops working and i am struggling. I have literally tried 30 times these last two days. Can some one help please? If shown once i should be ok, i pick up quickly.
Help would seriously be appreciated.
Class trying to move from, given that this is an extraction:
class GACanvas extends Panel implements ActionListener, Runnable {
private WorldMenuItems speedMenuItems, designMenuItemsPlantGrowth, designMenuItemsPlantCount;
     private WorldMenuItems designMenuItemsPlantEaten, designMenuItemsApproximatePopulation;
     private WorldMenuItems designMenuItemsEatersBorn,designMenuItemsMutationProbability;
     private WorldMenuItems designMenuItemsCrossoverProbability;
MenuBar getMenuBar() {
          menuBar = new MenuBar();
          addControlItemsToMenuBar();
          addSpeedItemsToMenuBar();
          addWorldDesignItemsToMenuBar();
          return menuBar;
This is the method i am trying to move (below)
public void itemsInsideWorldDesignMenu() {
          designMenuItemsPlantGrowth = new WorldMenuItems("Plants Grow",
                    new String[] { "In Rows", "In Clumps", "At Random",
                              "Along the Bottom", "Along the Edges" }, 1);
          designMenuItemsPlantCount = new WorldMenuItems("Number Of Plants",
                    new String[] { "50", "100", "150", "250", "500" }, 3);
          designMenuItemsPlantEaten = new WorldMenuItems("When a Plant is Eaten",
                    new String[] { "It grows back somewhere",
                              "It grows back nearby", "It's Gone" }, 0);
          designMenuItemsApproximatePopulation = new WorldMenuItems(
                    "Approximate Population", new String[] { "10", "20", "25",
                              "30", "40", "50", "75", "100" }, 2);
          designMenuItemsEatersBorn = new WorldMenuItems("Eaters are Born",
                    new String[] { "At the Center", "In a Corner",
                              "At Random Location", "At Parent's Location" }, 2);
          designMenuItemsMutationProbability = new WorldMenuItems(
                    "Mutation Probability", new String[] { "Zero", "0.25%", "0.5%",
                              "1%", "2%", "3%", "5%", "10%" }, 3);
          designMenuItemsCrossoverProbability = new WorldMenuItems(
                    "Crossover Probability", new String[] { "Zero", "10%", "25%",
                              "50%", "75%", "100%" }, 4);
Class Trying to move to:
class WorldMenuItems extends Menu implements ItemListener {
   private CheckboxMenuItem[] items;
   private int selectedIndex = -1;
   WorldMenuItems(String menuName, String[] itemNames) {
      this(menuName, itemNames, -1);
   WorldMenuItems(String menuName, String[] itemNames, int selected) {
      super(menuName);
      items = new CheckboxMenuItem[itemNames.length];
      for (int i = 0; i < itemNames.length; i++) {
         items[i] = new CheckboxMenuItem(itemNames);
add(items[i]);
items[i].addItemListener(this);
selectedIndex = selected;
if (selectedIndex < 0 || selectedIndex >= items.length)
selectedIndex = 1;
items[selectedIndex].setState(true);
     public int getSelectedIndex() {
          return selectedIndex;
public void itemStateChanged(ItemEvent evt) { // This works on other systems
CheckboxMenuItem newSelection = (CheckboxMenuItem)evt.getSource();
for (int i = 0; i < items.length; i++) {
if (newSelection == items[i]) {
items[selectedIndex].setState(false);
selectedIndex = i;
newSelection.setState(true);
return;

Ok i've done this. I am getting an error on the line specified. Can someone help me out and tell me what i need to do?
GACanvas
//IM GETTING AN ERROR ON THIS LINE UNDER NAME, SAYING IT IS NOT VISIBLE
WorldMenuItems worldmenuitems = new WorldMenuItems(name, null);
public MenuBar getMenuBar() {
          menuBar = new MenuBar();
          addControlItemsToMenuBar();
          addSpeedItemsToMenuBar();
          worldmenuitems.addWorldDesignItemsToMenuBar();
          return menuBar;
class WorldMenuItems extends Menu implements ItemListener {
     private WorldMenuItems speedMenuItems, designMenuItemsPlantGrowth, designMenuItemsPlantCount;
     private WorldMenuItems designMenuItemsPlantEaten, designMenuItemsApproximatePopulation;
     private WorldMenuItems designMenuItemsEatersBorn,designMenuItemsMutationProbability;
     private WorldMenuItems designMenuItemsCrossoverProbability;
     GACanvas gacanvas = new GACanvas(null);
   private CheckboxMenuItem[] items;
   private int selectedIndex = -1;
   WorldMenuItems(String menuName, String[] itemNames) {
      this(menuName, itemNames, -1);
   WorldMenuItems(String menuName, String[] itemNames, int selected) {
      super(menuName);
      items = new CheckboxMenuItem[itemNames.length];
      for (int i = 0; i < itemNames.length; i++) {
         items[i] = new CheckboxMenuItem(itemNames);
add(items[i]);
items[i].addItemListener(this);
selectedIndex = selected;
if (selectedIndex < 0 || selectedIndex >= items.length)
selectedIndex = 1;
items[selectedIndex].setState(true);
     public int getSelectedIndex() {
          return selectedIndex;
public void itemStateChanged(ItemEvent evt) { // This works on other systems
CheckboxMenuItem newSelection = (CheckboxMenuItem)evt.getSource();
for (int i = 0; i < items.length; i++) {
if (newSelection == items[i]) {
items[selectedIndex].setState(false);
selectedIndex = i;
newSelection.setState(true);
return;
public void itemsInsideWorldDesignMenu() {
     designMenuItemsPlantGrowth = new WorldMenuItems("Plants Grow",
               new String[] { "In Rows", "In Clumps", "At Random",
                         "Along the Bottom", "Along the Edges" }, 1);
     designMenuItemsPlantCount = new WorldMenuItems("Number Of Plants",
               new String[] { "50", "100", "150", "250", "500" }, 3);
     designMenuItemsPlantEaten = new WorldMenuItems("When a Plant is Eaten",
               new String[] { "It grows back somewhere",
                         "It grows back nearby", "It's Gone" }, 0);
     designMenuItemsApproximatePopulation = new WorldMenuItems(
               "Approximate Population", new String[] { "10", "20", "25",
                         "30", "40", "50", "75", "100" }, 2);
     designMenuItemsEatersBorn = new WorldMenuItems("Eaters are Born",
               new String[] { "At the Center", "In a Corner",
                         "At Random Location", "At Parent's Location" }, 2);
     designMenuItemsMutationProbability = new WorldMenuItems(
               "Mutation Probability", new String[] { "Zero", "0.25%", "0.5%",
                         "1%", "2%", "3%", "5%", "10%" }, 3);
     designMenuItemsCrossoverProbability = new WorldMenuItems(
               "Crossover Probability", new String[] { "Zero", "10%", "25%",
                         "50%", "75%", "100%" }, 4);
public void addWorldDesignItemsToMenuBar() {
     gacanvas = new GACanvas(null);
     itemsInsideWorldDesignMenu();
     Menu designMenuItems = new Menu("WorldDesign");
     designMenuItems.add(designMenuItemsPlantGrowth);
     designMenuItems.add(designMenuItemsPlantCount);
     designMenuItems.add(designMenuItemsPlantEaten);
     designMenuItems.add(designMenuItemsApproximatePopulation);
     designMenuItems.add(designMenuItemsEatersBorn);
     designMenuItems.add(designMenuItemsMutationProbability);
     designMenuItems.add(designMenuItemsCrossoverProbability);
     gacanvas.menuBar.add(designMenuItems);

Moving Variable from one class to another.

I need to get a Variable from one class to another how would I do this?

Well this is a very tipical scehario for every enterprise application. You always create logger classes that generate log files for your application, as that is the only way to track errors in your system when its in the production enviorment.
Just create a simple class that acts as the Logger, and have a method in it that accepts a variable of the type that you are are trying to pass; most commonly a String; but can be overloaded to accept constom classes. e.g.
class Logger
public void log(String message)
writeToFile("< " + new Date() + " > " + message);
public void log(CustomClass queueEvent)
log("queue message was: " + queueEvent.getMessage() + " at: " + queueEven.getEventTime());
}Hope this makes things clearer
Regards
Omer

Passing a parameter from one class to another class in the same package

Hi.
I am trying to pass a parameter from one class to another class with in a package.And i am Getting the variable as null every time.In the code there is two classes.
i. BugWatcherAction.java
ii.BugWatcherRefreshAction.Java.
We have implemented caching in the front-end level.But according to the business logic we need to clear the cache and again have to access the database after some actions are happened.There are another class file called BugwatcherPortletContent.java.
So, we are dealing with three java files.The database interaction is taken care by the portletContent.java file.Below I am giving the code for the perticular function in the bugwatcherPortletContent.java:
==============================================================
public Object loadContent() throws Exception {
Hashtable htStore = new Hashtable();
JetspeedRunData rundata = this.getInputData();
String pId = this.getPorletId();
PortalLogger.logDebug(" in the portlet content: "+pId);
pId1=pId;//done by sraha
htStore.put("PortletId", pId);
htStore.put("BW_HOME_URL",CommonUtil.getMessage("BW.Home.Url"));
htStore.put("BW_BUGVIEW_URL",CommonUtil.getMessage("BW.BugView.Url"));
HttpServletRequest request = rundata.getRequest();
PortalLogger.logDebug(
"BugWatcherPortletContent:: build normal context");
HttpSession session = null;
int bugProfileId = 0;
Hashtable bugProfiles = null;
Hashtable bugData = null;
boolean fetchProfiles = false;
try {
session = request.getSession(true);
// Attempting to get the profiles from the session.
//If the profiles are not present in the session, then they would have to be
// obtained from the database.
bugProfiles = (Hashtable) session.getAttribute("Profiles");
//Getting the selected bug profile id.
String bugProfileIdObj = request.getParameter("bugProfile" + pId);
// Getting the logged in user
String userId = request.getRemoteUser();
if (bugProfiles == null) {
fetchProfiles = true;
if (bugProfileIdObj == null) {
// setting the bugprofile id as -1 indicates "all profiles" is selected
bugProfileIdObj =(String) session.getAttribute("bugProfileId" + pId);
if (bugProfileIdObj == null) {
bugProfileId = -1;
else {
bugProfileId = Integer.parseInt(bugProfileIdObj);
else {
bugProfileId = Integer.parseInt(bugProfileIdObj);
session.setAttribute(
("bugProfileId" + pId),
Integer.toString(bugProfileId));
//fetching the bug list
bugData =BugWatcherAPI.getbugList(userId, bugProfileId, fetchProfiles);
PortalLogger.logDebug("BugWatcherPortletContent:: got bug data");
if (bugData != null) {
Hashtable htProfiles = (Hashtable) bugData.get("Profiles");
} else {
htStore.put("NoProfiles", "Y");
} catch (CodedPortalException e) {
htStore.put("Error", CommonUtil.getErrMessage(e.getMessage()));
PortalLogger.logException
("BugWatcherPortletContent:: CodedPortalException!!",e);
} catch (Exception e) {
PortalLogger.logException(
"BugWatcherPortletContent::Generic Exception!!",e);
htStore.put(     "Error",CommonUtil.getErrMessage(ErrorConstantsI.GET_BUGLIST_FAILED));
if (fetchProfiles) {
bugProfiles = (Hashtable) bugData.get("Profiles");
session.setAttribute("Profiles", bugProfiles);
// putting the stuff in the context
htStore.put("Profiles", bugProfiles);
htStore.put("SelectedProfile", new Integer(bugProfileId));
htStore.put("bugs", (ArrayList) bugData.get("Bugs"));
return htStore;
=============================================================
And I am trying to call this function as it can capable of fetching the data from the database by "getbugProfiles".
In the new class bugWatcherRefreshAction.java I have coded a part of code which actually clears the caching.Below I am giving the required part of the code:
=============================================================
public void doPerform(RunData rundata, Context context,String str) throws Exception {
JetspeedRunData data = (JetspeedRunData) rundata;
HttpServletRequest request = null;
//PortletConfig pc = portlet.getPortletConfig();
//String userId = request.getRemoteUser();
/*String userId = ((JetspeedUser)rundata.getUser()).getUserName();//sraha on 1/4/05
String pId = request.getParameter("PortletId");
PortalLogger.logDebug("just after pId " +pId); */
//Calling the variable holding the value of portlet id from BugWatcherAction.java
//We are getting the portlet id here , through a variable from BugWatcherAction.java
/*BugWatcherPortletContent bgAct = new BugWatcherPortletContent();
String portletID = bgAct.pId1;
PortalLogger.logDebug("got the portlet ID in bugwatcherRefreshAction:---sraha"+portletID);*/
// updating the bug groups
Hashtable result = new Hashtable();
try {
request = data.getRequest();
String userId = ((JetspeedUser)data.getUser()).getUserName();//sraha on 1/4/05
//String pId = (String)request.getParameter("portletId");
//String pId = pc.getPorletId();
PortalLogger.logDebug("just after pId " +pId);
PortalLogger.logDebug("after getting the pId-----sraha");
result =BugWatcherAPI.getbugList(profileId, userId);
PortalLogger.logDebug("select the new bug groups:: select is done ");
context.put("SelectedbugGroups", profileId);
//start clearing the cache
ContentCacheContext cacheContext = getCacheContext(rundata);
PortalLogger.logDebug("listBugWatcher Caching - removing markup content - before removecontent");
// remove the markup content from cache.
PortletContentCache.removeContent(cacheContext);
PortalLogger.logDebug("listBugWatcher Caching-removing markup content - after removecontent");
//remove the backend content from cache
CacheablePortletData pdata =(CacheablePortletData) PortletCache.getCacheable(PortletCacheHelper.getUserHandle(((JetspeedUser)data.getUser()).getUserName()));
PortalLogger.logDebug("listBugWatcher Caching User: " +((JetspeedUser)data.getUser()).getUserName());
PortalLogger.logDebug("listBugWatcher Caching pId: " +pId);
if (pdata != null)
// User's data found in cache!
PortalLogger.logDebug("listBugWatcher Caching -inside pdata!=null");
pdata.removeObject(PortletCacheHelper.getUserPortletHandle(((JetspeedUser)data.getUser()).getUserName(),pId));
PortalLogger.logDebug("listBugWatcher Caching -inside pdata!=null- after removeObject");
PortalLogger.logDebug("listBugWatcher Caching -finish calling the remove content code");
//end clearing the cache
// after clearing the caching calling the data from the database taking a fn from the portletContent.java
PortalLogger.logDebug("after clearing cache---sraha");
BugWatcherPortletContent bugwatchportcont = new BugWatcherPortletContent();
Hashtable httable= new Hashtable();
httable=(Hashtable)bugwatchportcont.loadContent();
PortalLogger.logDebug("after making the type casting-----sraha");
Set storeKeySet = httable.keySet();
Iterator itr = storeKeySet.iterator();
while (itr.hasNext()) {
String paramName = (String) itr.next();
context.put(paramName, httable.get(paramName));
PortalLogger.logDebug("after calling the databs data from hashtable---sraha");
} catch (CodedPortalException e) {
PortalLogger.logException("bugwatcherRefreshAction:: Exception- ",e);
context.put("Error", CommonUtil.getErrMessage(e.getMessage()));
catch (Exception e) {
PortalLogger.logException("bugwatcherRefreshAction:: Exception- ",e);
context.put(     "Error",CommonUtil.getErrMessage(ErrorConstantsI.EXCEPTION_CODE));
try {
((JetspeedRunData) data).setCustomized(null);
if (((JetspeedRunData) data).getCustomized() == null)
ActionLoader.getInstance().exec(data,"controls.EndCustomize");
catch (Exception e)
PortalLogger.logException("bugwatcherRefreshAction", e);
===============================================================
In the bugwatcher Action there is another function called PostLoadContent.java
here though i have found the portlet Id but unable to fetch that in the bugWatcherRefreshAction.java . I am also giving the code of that function under the bugWatcherAction.Java
================================================
// Get the PortletData object from intermediate store.
CacheablePortletData pdata =(CacheablePortletData) PortletCache.getCacheable(PortletCacheHelper.getUserHandle(
//rundata.getRequest().getRemoteUser()));
((JetspeedUser)rundata.getUser()).getUserName()));
pId1 = (String)portlet.getID();
PortalLogger.logDebug("in the bugwatcher action:"+pId1);
try {
Hashtable htStore = null;
// if PortletData is available in store, get current portlet's data from it.
if (pdata != null) {
htStore =(Hashtable) pdata.getObject(     PortletCacheHelper.getUserPortletHandle(
((JetspeedUser)rundata.getUser()).getUserName(),portlet.getID()));
//Loop through the hashtable and put its elements in context
Set storeKeySet = htStore.keySet();
Iterator itr = storeKeySet.iterator();
while (itr.hasNext()) {
String paramName = (String) itr.next();
context.put(paramName, htStore.get(paramName));
bugwatcherRefreshAction bRefAc = new bugwatcherRefreshAction();
bRefAc.doPerform(pdata,context,pId1);
=============================================================
So this is the total scenario for the fetching the data , after clearing the cache and display that in the portal.I am unable to do that.Presently it is still fetching the data from the cache and it is not going to the database.Even the portlet Id is returning as null.
I am unable to implement that thing.
If you have any insight about this thing, that would be great .As it is very urgent a promt response will highly appreciated.Please send me any pointers or any issues for this I am unable to do that.
Please let me know as early as possible.
Thanks and regards,
Santanu Raha.

Have you run it in a debugger? That will show you exactly what is happening and why.

Calling a method of one class from another withing the same package

hi,
i've some problem in calling a method of one class from another class within the same package.
for eg. if in Package mypack. i'm having 2 files, f1 and f2. i would like to call a method of f2 from f1(f1 is a servlet) . i donno exactly how to instantiate the object for f2. can anybody please help me in this regard.
Thank u in advance.
Regards,
Fazli

This is what my exact problem.
i've created a bean (DataBean) to access the database. i'm having a servlet program (ShopBook). now to check some details over there in the database from the servlet i'm in need to use a method in the DataBean.
both ShopBook.java and DataBean.java lies in the package shoppack.
in ShopBook i tried to instantiate the object to DataBean as
DataBean db = new DataBean();
it shows the compiler error, unable to resolve symbol DataBean.
note:
first i compiled DataBean.java, it got compiled perfectly and the class file resides inside the shoppack.
when i'm trying to compile the ShopBook its telling this error.
hope i'm clear in explaining my problem. can u please help me?
thank u in advance.
regards,
Fazli

Pass RowSet from one class to another

Hi, i am trying to pass a rowset from one class to another but i keep getting the error messages:
method does not return a value
statement not reachable
Does anybody know why?
package project1;
import java.sql.SQLException;
public class readdata {
    public static void main(String[] args) {
        Class2 cl = new Class2();
        try {
        while (cl.openConnection().next()) {
            System.out.println(cl.openConnection().getInt("id") + "-");
        catch (SQLException se)
                System.out.println(se);
       // while (rs.next())
         //       System.out.println(rs.getInt("id") + "-");
         //       System.out.println(rs.getString("field1") + '\n');
package project1;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.sql.RowSet;
public class Class2 {
   private Connection conn;
    public Class2() {
        openConnection();
    public RowSet openConnection()
            try
                    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
                    conn = DriverManager.getConnection("jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=D:\\test.mdb;PWD=","admin","");
                    Statement command = conn.createStatement();
                    RowSet rs = (RowSet)command.executeQuery("select * FROM testing");
                    return rs;
                    System.out.println("Connected To Access");
                    rs.close();
                    conn.close();
            catch (SQLException se)
                    System.out.println(se);
            catch (Exception ex)
                    System.out.println(ex);
}Thanks in advance
Message was edited by:
snipered2003
Message was edited by:
snipered2003

Hi snipered2003
I'm fairly new to java, so check out anything I say.
to me it appears that the code within your try block in the main method of readdata class can never throw a SQLException since the calls are to cl.openConnection() which catches any SQLException and does not throw it.
So one statement not reachable is the statement in the catch blockSystem.out.println(se);Second, the only return statement in your openConnection() method is inside the try block, whic means that if an exception is encountered there will be no RowSet returned by the method.
Secondly, the code in the try block in your Class2.openConnection() after the return statement will also never be reached.
You may need something like    public RowSet openConnection()
        RowSet rs = null;
        try
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
            conn = DriverManager.getConnection("jdbc:odbc:;DRIVER=Microsoft Access Driver (*.mdb);DBQ=D:\\test.mdb;PWD=","admin","");
            Statement command = conn.createStatement();
            rs = (RowSet)command.executeQuery("select * FROM testing");
            System.out.println("Connected To Access");
        catch (SQLException se)
            System.out.println(se);
        catch (Exception ex)
            System.out.println(ex);
        return rs;
    }But you will have to check for a null return value in the call to the method.
It also looks like the code in your main method, when these things are ironed out, will run an infinite loop, but I could be wrong on that.
I think (note: think) this part should be        RowSet rs = cl.openConnection()
        if (rs != null) {
            while (rs.next()) {
                System.out.println(rs.getInt("id") + "-");
            rs.close();
        }Anybody please correct me if I am wrong.
And I don't know where the conn.close would fit in this scheme of things.
Cheers, Darryl

Fire event from one class to another.

I have a Login JFrame class that allows users to enter username and password. I then have another JFrame class which will monitor when someone logs in. I am trying to get the username and password to appear on the monitor login frame text area when the user presses enter on the login frame.
I can get it ot work by passing the Monitor class into the Login classes constructor but I want to be able to open the classes separately.When I try to open separatley at present I get java.lang.NullPointerException
     at project.LoginGUI.actionPerformed(LoginGUI.java:70) which is referring to the following code:
if(listen.equals("OK")){
     GymMonitor.username.setText(username.getText());
Both classes are in the same package. What I want to know is how to fire an event from one class to another? when the class you are firing to is constructed separately.
I hope this question is not too verbose.
Thanks

Generally for something like this you would use a listener.
Your login window is its own entity--it has a user interface, and it gets some information which someone else could ask it for. It could even generate its own events, such as when the user presses "OK". You would first define an interface for anyone who wants to know when someone logs in:
public interface ILoginListener extends java.util.EventListener
public void login(LoginEvent event);
}You would then define the LoginEvent class to contain information like what the user entered for username and password. You could give your login dialog a couple of methods:
private Vector myListeners = new Vector();
public void addLoginListener(ILoginListener listener) {
    myListeners.add(listener);
public void removeLoginListener(ILoginListener listener) {
    myListeners.remove(listener);
protected void fireLogin(LoginEvent event) {
    for (Iterator it = myListeners.iterator(); it.hasNext(); ) {
      ILoginListener listener = (ILoginListener)it.next();
      listener.login(event);
}You'd have your login dialog call fireLogin every time the user logged in.
Then, you could implement ILoginListener in your monitor window:
public void login(LoginEvent event) {
    // now do something with the event you just got.
}All the code I put in here is really generic stuff. You'll write this kind of stuff hundreds of times probably during your career. I haven't tested it though.
Hope this helps. :)

Object Creation Of One class into another and vice versa

Hello Everyone,
My name is Prashant Sharma from Jaipur [Rajasthan]
Can u people help me
How to create of one class into another and vice versa
Eg,
I am having class A and class B
I want to create object of class A into class B and vice versa
Plz help me out of this problem as soon as possible....

Read this: [Creating Objects|http://java.sun.com/docs/books/tutorial/java/javaOO/objectcreation.html]
Then, do one of these three:
1. Create an instance of the class
2. Extend the class
3. Access methods within the class
Try it out. Post the problem code if you're having trouble.

In oneasset class i have created 2 assets by using of aso1 after that i acquired one asset for that i run the depreciation for first 5 periods, it has been showing depreciation for those period but if i am trying to run the depreciation for second asset i

in on asset class i have created 2 assets by using of aso1 after that i acquired one asset for that i run the depreciation for first 5 periods, it has been showing depreciation for those period but if i am trying to run the depreciation for second asset it is not showing first 5 periods why it is not showing? Is there any reason?

Hi
Repeat run you can do only for the last depreciation period. For the asset which you are tryin to post depreciation from July to Jan, please check the asset value date which you have given while posting the transactions or in the asset master.
If the asset value date is in July, then deprecaition from July - Jan will get posted in the current month depreciation in total. You will not be able to post depreciation individually month wise using AFAB.
REgards
Malathi

Accessing a variable defined in one class from another class..

Greetings,
I've only been programming in as3 for a couple months, and so far I've written several compositional classes that take MovieClips as inputs to handle behaviors and interactions in a simple game I'm creating. One problem I keep coming upon is that I'd love to access the custom variables I define within one class from another class. In the game I'm creating, Main.as is my document class, from which I invoke a class called 'Level1.as' which invokes all the other classes I've written.
Below I've pasted my class 'DieLikeThePhishes'. For example, I would love to know the syntax for accessing the boolean variable 'phish1BeenHit' (line 31) from another class. I've tried the dot syntax you would use to access a MovieClip inside another MovieClip and it doesn't seem to be working for me. Any ideas would be appreciated. Thanks,
- Jeremy
package jab.enemy
import flash.display.MovieClip;
import flash.events.Event;
import jab.enemy.MissleDisappear;
public class DieLikeThePhishes
private var _clip2:MovieClip; // player
private var _clip3:MovieClip; //phish1
private var _clip4:MovieClip; //phish2
private var _clip5:MovieClip; //phish3
private var _clip6:MovieClip; //phish4
private var _clip10:MovieClip; // background
private var _clip11:MovieClip // missle1
private var _clip12:MovieClip // missle2
private var _clip13:MovieClip // missle3
private var _clip14:MovieClip // missle4
private var _clip15:MovieClip // missle5
private var _clip16:MovieClip // missle6
private var _clip17:MovieClip // missle7
private var _clip18:MovieClip // missle8
private var _clip19:MovieClip // missle9
private var _clip20:MovieClip // missle10
private var _clip21:MovieClip // missle11
private var _clip22:MovieClip // missle12
var ay1 = 0;var ay2 = 0;var ay3 = 0;var ay4 = 0;
var vy1 = 0;var vy2 = 0;var vy3 = 0;var vy4 = 0;
var phish1BeenHit:Boolean = false;var phish2BeenHit:Boolean = false;
var phish3BeenHit:Boolean = false;var phish4BeenHit:Boolean = false;
public function DieLikeThePhishes(clip2:MovieClip,clip3:MovieClip,clip4:MovieClip,clip5:MovieClip,clip6:M ovieClip,clip10:MovieClip,clip11:MovieClip,clip12:MovieClip,clip13:MovieClip,clip14:MovieC lip,clip15:MovieClip,clip16:MovieClip,clip17:MovieClip,clip18:MovieClip,clip19:MovieClip,c lip20:MovieClip,clip21:MovieClip,clip22:MovieClip)
_clip2 = clip2;_clip3 = clip3;_clip4 = clip4;_clip5 = clip5;_clip6 = clip6;
_clip10 = clip10;_clip11 = clip11;_clip12 = clip12;_clip13 = clip13;_clip14 = clip14;
_clip15 = clip15;_clip16 = clip16;_clip17 = clip17;_clip18 = clip18;_clip19 = clip19;
_clip20 = clip20;_clip21 = clip21;_clip22= clip22;
_clip3.stage.addEventListener(Event.ENTER_FRAME, onEnterFrame)
function onEnterFrame(event:Event):void
vy1+= ay1;_clip3.y += vy1; vy2+= ay2;_clip4.y += vy2;
vy3+= ay3;_clip5.y += vy3; vy4+= ay4;_clip6.y += vy4;
if (phish1BeenHit ==false)
if(_clip3.y >620)
{_clip3.y = 620;}
if (phish2BeenHit ==false)
if(_clip4.y >620)
{_clip4.y = 620;}
if (phish3BeenHit ==false)
if(_clip5.y >620)
{_clip5.y = 620;}
if (phish4BeenHit ==false)
if(_clip6.y >620)
{_clip6.y = 620;}
if (_clip11.hitTestObject(_clip3) ||_clip12.hitTestObject(_clip3)||_clip13.hitTestObject(_clip3)||_clip14.hitTestObject(_cl ip3)||_clip15.hitTestObject(_clip3)||_clip16.hitTestObject(_clip3)||_clip17.hitTestObject( _clip3)||_clip18.hitTestObject(_clip3)||_clip19.hitTestObject(_clip3)||_clip20.hitTestObje ct(_clip3)||_clip21.hitTestObject(_clip3)||_clip22.hitTestObject(_clip3))
_clip3.scaleY = -Math.abs(_clip3.scaleY);
_clip3.alpha = 0.4;
ay1 = 3
vy1= -2;
phish1BeenHit = true;
if (_clip11.hitTestObject(_clip4) ||_clip12.hitTestObject(_clip4)||_clip13.hitTestObject(_clip4)||_clip14.hitTestObject(_cl ip4)||_clip15.hitTestObject(_clip4)||_clip16.hitTestObject(_clip4)||_clip17.hitTestObject( _clip4)||_clip18.hitTestObject(_clip4)||_clip19.hitTestObject(_clip4)||_clip20.hitTestObje ct(_clip4)||_clip21.hitTestObject(_clip4)||_clip22.hitTestObject(_clip4))
_clip4.scaleY = -Math.abs(_clip4.scaleY);
_clip4.alpha = 0.4;
ay2 = 3
vy2= -2;
phish2BeenHit = true;
if (_clip11.hitTestObject(_clip5) ||_clip12.hitTestObject(_clip5)||_clip13.hitTestObject(_clip5)||_clip14.hitTestObject(_cl ip5)||_clip15.hitTestObject(_clip5)||_clip16.hitTestObject(_clip5)||_clip17.hitTestObject( _clip5)||_clip18.hitTestObject(_clip5)||_clip19.hitTestObject(_clip5)||_clip20.hitTestObje ct(_clip5)||_clip21.hitTestObject(_clip5)||_clip22.hitTestObject(_clip5))
_clip5.scaleY = -Math.abs(_clip5.scaleY);
_clip5.alpha = 0.4;
ay3 = 3
vy3= -2;
phish3BeenHit = true;
if (_clip11.hitTestObject(_clip6) ||_clip12.hitTestObject(_clip6)||_clip13.hitTestObject(_clip6)||_clip14.hitTestObject(_cl ip6)||_clip15.hitTestObject(_clip6)||_clip16.hitTestObject(_clip6)||_clip17.hitTestObject( _clip6)||_clip18.hitTestObject(_clip6)||_clip19.hitTestObject(_clip6)||_clip20.hitTestObje ct(_clip6)||_clip21.hitTestObject(_clip6)||_clip22.hitTestObject(_clip6))
_clip6.scaleY = -Math.abs(_clip6.scaleY);
_clip6.alpha = 0.4;
ay4 = 3
vy4= -2;
phish4BeenHit = true;
if (_clip3.y > 10000)
_clip3.x = 1000 +3000*Math.random()-_clip10.x;
_clip3.y = 300;
_clip3.alpha = 1;
_clip3.scaleY = Math.abs(_clip3.scaleY);
ay1 = vy1 = 0;
phish1BeenHit = false;
if (_clip4.y > 10000)
_clip4.x = 1000 +3000*Math.random()-_clip10.x;
_clip4.y = 300;
_clip4.alpha = 1;
_clip4.scaleY = Math.abs(_clip4.scaleY);
ay2 = vy2 = 0;
phish2BeenHit = false;
if (_clip5.y > 10000)
_clip5.x = 1000 +3000*Math.random()-_clip10.x;
_clip5.y = 300;
_clip5.alpha = 1;
_clip5.scaleY = Math.abs(_clip5.scaleY);
ay3 = vy3 = 0;
phish3BeenHit = false;
if (_clip6.y > 10000)
_clip6.x = 1000 +3000*Math.random()-_clip10.x;
_clip6.y = 300;
_clip6.alpha = 1;
_clip6.scaleY = Math.abs(_clip6.scaleY);
ay4 = vy4 = 0;
phish4BeenHit = false;
var missleDisappear1 = new MissleDisappear(_clip11,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear2 = new MissleDisappear(_clip12,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear3 = new MissleDisappear(_clip13,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear4 = new MissleDisappear(_clip14,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear5 = new MissleDisappear(_clip15,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear6 = new MissleDisappear(_clip16,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear7 = new MissleDisappear(_clip17,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear8 = new MissleDisappear(_clip18,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear9 = new MissleDisappear(_clip19,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear10 = new MissleDisappear(_clip20,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear11 = new MissleDisappear(_clip21,_clip3,_clip4,_clip5,_clip6,_clip10);
var missleDisappear12 = new MissleDisappear(_clip22,_clip3,_clip4,_clip5,_clip6,_clip10);

I would approach it in much the same way as you would in java, by making getters and setters for all of your class variables.
Getters being for returning the values, Setters being for setting them.
So you would make a get function for the variable you want to access ala:
function get1PhishBeenHit():boolean {
return this.phish1BeenHit;
Then to access the value of that variable from outwith the class:
var result:boolean = ClassInstanceName.get1PhishBeenHit();

How to transter contents of itab from one class to another...

Hello experts,
I am currently having problems on how to transfer the contents of an itab or even
the value of a variable from one class to another. For example, I have 10 records
in it_spfli in class 1 and when I loop at it_spfli in the method of class 2 it has no records!
This is an example:
class lcl_one definition.
public section.
data: gt_spfli type table of spfli.
methods get_data.
endclass.
class lcl_one implementation.
method get_data.
select * from spfli
into table gt_spfli.
endmethod.
endclass.
class lcl_two definition inheriting from lcl_one.
public section.
methods loop_at_itab.
endclass.
class lcl_two implementation.
method loop_at_itab.
field-symbols: <fs_spfli> like line of gt_spfli.
loop at gt_spfli assigning <fs_spfli>.
   write: / <fs_spfli>-carrid.
endloop.
endmethod.
endclass.
start-of-selection.
data: one type ref to lcl_one,
      two type ref to lcl_two.
create object: one, two.
call method one->get_data.
call method two->loop_at_itab.
In the example above, the contents of gt_spfli in class lcl_two is empty
even though it has records in class lcl_one. Help would be appreciated.
Thanks a lot guys and take care!

Hi Uwe,
It is still the same. Here is my code:
REPORT zfi_ors_sms
       NO STANDARD PAGE HEADING
       LINE-SIZE 255
       LINE-COUNT 65
       MESSAGE-ID zz.
Include program/s                            *
INCLUDE zun_standard_routine.           " Standard Routines
INCLUDE zun_header.                     " Interface Header Record
INCLUDE zun_footer.                     " Interface Footer Record
INCLUDE zun_interface_control.          " Interface Control
INCLUDE zun_external_routine.           " External Routines
INCLUDE zun_globe_header.               " Report header
INCLUDE zun_bdc_routine.                " BDC Routine
Data dictionary table/s                      *
TABLES: bkpf,
        rf05a,
        sxpgcolist.
Selection screen                             *
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001.
PARAMETERS: p_file TYPE sxpgcolist-parameters.
SELECTION-SCREEN END OF BLOCK b1.
*/ CLASS DEFINITIONS
      CLASS lcl_main DEFINITION
CLASS lcl_main DEFINITION ABSTRACT.
PUBLIC SECTION.
Structure/s                                  *
    TYPES: BEGIN OF t_itab,
            rec_content(100) TYPE c,
           END OF t_itab.
    TYPES: BEGIN OF t_upfile,
            record_id(2)    TYPE c,            " Record ID
            rec_date(10)    TYPE c,            " Record Date MM/DD/YYYY
            prod_line(10)   TYPE c,            " Product Line
            acc_code(40)    TYPE c,            " Acc Code
            description(50) TYPE c,            " Description
            hits(13)        TYPE c,            " Hits
            amount(15)      TYPE c,            " Amount
           END OF t_upfile.
Internal table/s                             *
    DATA: gt_bdcdata    TYPE STANDARD TABLE OF bdcdata,
          gt_bdcmsgcoll TYPE STANDARD TABLE OF bdcmsgcoll,
          gt_itab       TYPE STANDARD TABLE OF t_itab,
          gt_header     LIKE TABLE OF interface_header,
          gt_footer     LIKE TABLE OF interface_footer,
          gt_upfile     TYPE STANDARD TABLE OF t_upfile.
Global variable/s                            *
    DATA: gv_target             TYPE rfcdisplay-rfchost,
          gv_err_flag(1)        TYPE n VALUE 0,
          gv_input_dir(100)     TYPE c
                                 VALUE '/gt/interface/FI/ORS/inbound/',
          gv_inputfile_dir(255) TYPE c,
          gv_eof_flag           TYPE c VALUE 'N',
          gv_string             TYPE string,
          gv_delimiter          TYPE x VALUE '09',
          gv_input_records(3)   TYPE n,
          gv_input_file_ctr(6) TYPE n,
          gv_proc_tot_amt(14)   TYPE p DECIMALS 2,
          gv_prg_message        TYPE string,
          gv_gjahr              TYPE bkpf-gjahr,
          gv_monat              TYPE bsis-monat.
Work area/s                                  *
    DATA: wa_itab               LIKE LINE OF gt_itab,
          wa_upfile             LIKE LINE OF gt_upfile,
          wa_footer             LIKE LINE OF gt_footer,
          wa_header             LIKE LINE OF gt_header.
ENDCLASS.
      CLASS lcl_read_app_server_file DEFINITION
CLASS lcl_read_app_server_file DEFINITION INHERITING FROM lcl_main.
PUBLIC SECTION.
    METHODS: read_app_server_file,
             read_input_file,
             split_header,
             process_upload_file,
             split_string,
             conv_num CHANGING value(amount) TYPE t_upfile-amount,
             split_footer,
             update_batch_control,
             process_data.
ENDCLASS.
      CLASS lcl_process_data DEFINITION
CLASS lcl_process_data DEFINITION INHERITING FROM
                                             lcl_read_app_server_file.
PUBLIC SECTION.
    METHODS process_data REDEFINITION.
ENDCLASS.
*/ CLASS IMPLEMENTATIONS
      CLASS lcl_read_app_server_file IMPLEMENTATION
CLASS lcl_read_app_server_file IMPLEMENTATION.
*/ METHOD read_app_server_file - MAIN METHOD
METHOD read_app_server_file.
    gv_target = sy-host.
    PERFORM file_copy USING 'ZPPDCP' p_file 'HP-UX'
            gv_target CHANGING gv_err_flag.
    CONCATENATE gv_input_dir p_file INTO gv_inputfile_dir.
open application server file
    PERFORM open_file USING gv_inputfile_dir 'INPUT'
                               CHANGING gv_err_flag.
    WHILE gv_eof_flag = 'N'.
      READ DATASET gv_inputfile_dir INTO wa_itab.
      APPEND wa_itab TO gt_itab.
      IF sy-subrc <> 0.
        gv_eof_flag = 'Y'.
        EXIT.
      ENDIF.
      CALL METHOD me->read_input_file.
    ENDWHILE.
close application file server
    PERFORM close_file USING gv_inputfile_dir.
    IF wa_footer-total_no_rec <> gv_input_file_ctr.
      MOVE 'Header Control on Number of Records is Invalid' TO
           gv_prg_message.
      PERFORM call_ws_message USING 'E' gv_prg_message 'Error'.
      gv_err_flag = 1.
    ELSEIF wa_footer-total_no_rec EQ 0 AND gv_input_file_ctr EQ 0.
      MOVE 'Input File is Empty. Batch Control will be Updated' TO
           gv_prg_message.
      PERFORM call_ws_message USING 'I' gv_prg_message 'Information'.
      CALL METHOD me->update_batch_control.
      gv_err_flag = 1.
    ENDIF.
    IF gv_err_flag <> 1.
      IF wa_footer-total_amount <> gv_proc_tot_amt.
        MOVE 'Header Control on Amount is Invalid' TO gv_prg_message.
        PERFORM call_ws_message USING 'E' gv_prg_message 'Error'.
        gv_err_flag = 1.
      ENDIF.
    ENDIF.
ENDMETHOD.
*/ METHOD read_input_file
METHOD read_input_file.
    CASE wa_itab-rec_content+0(2).
      WHEN '00'.
        CALL METHOD me->split_header.
      WHEN '01'.
        CALL METHOD me->process_upload_file.
        ADD 1 TO gv_input_file_ctr.
        ADD wa_upfile-amount TO gv_proc_tot_amt.
      WHEN '99'.
        CALL METHOD me->split_footer.
      WHEN OTHERS.
        gv_err_flag = 1.
    ENDCASE.
ENDMETHOD.
*/ METHOD split_header
METHOD split_header.
    CLEAR: wa_header,
           gv_string.
    MOVE wa_itab TO gv_string.
    SPLIT gv_string AT gv_delimiter INTO
          wa_header-record_id
          wa_header-from_system
          wa_header-to_system
          wa_header-event
          wa_header-batch_no
          wa_header-date
          wa_header-time.
    APPEND wa_header TO gt_header.
ENDMETHOD.
*/ METHOD process_upload_file
METHOD process_upload_file.
    CLEAR gv_string.
    ADD 1 TO gv_input_records.
    MOVE wa_itab-rec_content TO gv_string.
    CALL METHOD me->split_string.
    CALL METHOD me->conv_num CHANGING amount = wa_upfile-amount.
    APPEND wa_upfile TO gt_upfile.
ENDMETHOD.
*/ METHOD split_string
METHOD split_string.
    CLEAR wa_upfile.
    SPLIT gv_string AT gv_delimiter INTO
          wa_upfile-record_id
          wa_upfile-rec_date
          wa_upfile-prod_line
          wa_upfile-acc_code
          wa_upfile-description
          wa_upfile-hits
          wa_upfile-amount.
ENDMETHOD.
*/ METHOD conv_num
METHOD conv_num.
    DO.
      REPLACE gv_delimiter WITH ' ' INTO amount.
      IF sy-subrc <> 0.
        EXIT.
      ENDIF.
    ENDDO.
ENDMETHOD.
*/ METHOD split_footer
METHOD split_footer.
    CLEAR: wa_footer,
           gv_string.
    MOVE wa_itab TO gv_string.
    SPLIT gv_string AT gv_delimiter INTO
          wa_footer-record_id
          wa_footer-total_no_rec
          wa_footer-total_amount.
    CALL METHOD me->conv_num CHANGING amount = wa_footer-total_amount.
    APPEND wa_footer TO gt_footer.
ENDMETHOD.
*/ METHOD update_batch_control
METHOD update_batch_control.
    DATA: lv_sys_date      TYPE sy-datum,
          lv_sys_time      TYPE sy-uzeit,
          lv_temp_date(10) TYPE c.
    CONCATENATE wa_header-date4(4) wa_header-date2(2)
                wa_header-date+0(2)
           INTO lv_temp_date.
    MOVE lv_temp_date TO wa_header-date.
    APPEND wa_header-date TO gt_header.
Update ZTF0001 Table
    PERFORM check_interface_header USING wa_header 'U' 'GLOB'
                                   CHANGING gv_err_flag.
Archive files
    PERFORM archive_files USING 'ZPPDARC' gv_inputfile_dir 'HP-UX'
            gv_target CHANGING gv_err_flag.
ENDMETHOD.
METHOD process_data.
    SORT gt_upfile ASCENDING.
    CLEAR wa_upfile.
    READ TABLE gt_upfile INDEX 1 INTO wa_upfile.
    IF sy-subrc = 0.
      MOVE: wa_upfile-rec_date+6(4) TO gv_gjahr,
            wa_upfile-rec_date+0(2) TO gv_monat.
    ENDIF.
ENDMETHOD.
ENDCLASS.
      CLASS lcl_process_data IMPLEMENTATION
CLASS lcl_process_data IMPLEMENTATION.
METHOD process_data.
    CALL METHOD super->process_data.
    IF NOT gt_upfile[] IS INITIAL.
    ENDIF.
ENDMETHOD.
ENDCLASS.
Start of selection                           *
START-OF-SELECTION.
DATA: read TYPE REF TO lcl_read_app_server_file,
        process TYPE REF TO lcl_process_data.
CREATE OBJECT: read, process.
CALL METHOD read->read_app_server_file.
CALL METHOD process->process_data.

Passing Variables from One Class to Another

Hello, I am new to Java Programming and I'm currently starting off by trying to build a simple application.
I need help to pass variables created in one class to another.
In my source package, I created 2 java classes.
1. Main.java
2. InputFileDeclared.java
InputFileDeclared reads numerical data from an external text file and store them as string variables within the main method while Main converts a text string into a number.
Hence, I would like to pass these strings variables from the InputFileDeclared class to the Main class so that they can be converted into numbers.
I hope somebody out there may enlighten me on this.
Thank you very much in advance!

Values are passed from method to method, rather than from class to class. In a case such as you describe the code of a method in Main will probably call a method in InputFileDeclared which will return the String you want. The method in Main stores that in a local variable and processes it. It really doesn't matter here which class the method is in.
You InputFileDeclared object probably contains "state" information in its fields such as the details of the file it's reading and how far it's got, but generally the calling method in Main won't need to know about this state, just the last data read.
So the sequence in the method in Main will be:
1) Create an new instance of InputFileDeclared, probably passing it the file path etc..
2) Repeatedly call a method on that instance to return data values, until the method signals that it's reached the end of file, e.g. by returning a null String.
3) Probably call a "close()" method on the instance, which you should have written to close the file.

Can I substitute one class for another at run time

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