Method of JUErrorHandlerDlg sub class

Hi Forum
i am working jClint/Swing Application in jDevloper.And
i want to use own custom messageBox rather than exception
through from database BC4J.
I fund JUErrorHandlerDlg sub class for exception through
so how to method use for this.
please reply me some code.
javed

Thanks! for reply
But until i found problem ,how to catch exception
throw by bc4j(Jbo error meassage),exception has a
error number(like jbo-10426).
So using this error number how to use
this exception,In order to own message dilog.
please reply me some code,
use in our class as
public class subJUErrorHandlerDlg extends
JUErrorHandlerDlg
public subJUErrorHandlerDlg()
// i write bootstrap application
JUMetaObjectManager.setBaseErrorHandler(new subJUErrorHandlerDlg());

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Is it possible to OVERLOAD a super-class method in a sub-class?

Hi all,
I have a query that
Is it possible to OVERLOAD a super-class method in a sub-class?
If it is possible, please give me an example.
Thanks,
Hari

Hi,
Is the method int Display(int a){} overloading
the super-class's void Display() method? If
possible, please clarify this and how it would be
method overloading?
hanks,
Hari
Hi Hari,
Yes, it is possible. Look at this piece of code:
class Senior
     void Display()
          System.out.println("Super class method");
class Junior extends Senior
     int Display(int a)
          System.out.println("Subclass method: "+a);
          return(a+10);
     }> }
class example
     public static void main(String args[])
          Junior j = new Junior();
          j.Display();
System.out.println("Subclass method
od "+j.Display(5));
Is this what you were asking? Hope this helped.Hi,
I guess you guys are confused here...
Overloading is achieved by methods in the same class...
Overriding is across a superclass subclass methds.

Can we chagne Super class method parameters in Sub class

Hi,
I created a super class. In that class i created a method. That method is having 4 input parameters and 4 export parameters.
I created a sub class for that super class. I need to use only 2 input parameters in this class rather than 4 parameters. I want to delete 2 Input parameters in the sub class of the super class method. Is it possible.
If possible. can we give an simple code or pseudo code?
regards,
krishna

Hi,
I think you can not.
Because, only public attributes can be inherited and they will remain public in the subclass.
for further detail check,
http://help.sap.com/saphelp_nw70/helpdata/en/1d/df5f57127111d3b9390000e8353423/content.htm
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Calling a method from a super class

Hello, I'm trying to write a program that will call a method from a super class. This program is the test program, so should i include extends in the class declaration? Also, what code is needed for the call? Just to make things clear the program includes three different types of object classes and one abstract superclass and the test program which is what im having problems with. I try to use the test program to calculate somthing for each of them using the abstract method in the superclass, but its overridden for each of the three object classes. Now to call this function what syntax should I include? the function returns a double. Thanks.

Well, this sort of depends on how the methods are overridden.
public class SuperFoo {
public void foo() {
     //do something;
public void bar(){
     //do something
public class SubFoo extends SuperFoo {
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Overwriting a method of a super class in the subclass ???

Hi,
can somebody tell me whether it's possible to add a new implementation of a method in the sub class which is inherited from a super class?
I want to model my program in that way:
1. I define a super class with some implemented methods.
2. This class should be inherited in a sub class. One method should be used as it was implemented in the super class but another method should be overwritten in the subclass.
I know this concept from Java but I couldn't find a way how to do it in ABAP
Many thanks for any help!
Best regards,
Birgit

hi,
yeas you can do it,
Subclass can re-implement the inherited public and protected methods from superclass.Class C1 contains method METH1(public) and METH2(protected), both of which are modified and re-implemented in its subclass C2.also you can have ur own methods in subclass.Objects are created out of both classes and the method METH1 for both objects are called.
Output of the program demonstrates different behaviour for method METH1 of class C1 and C2.
This demonstrates the theme.
REPORT YSUBDEL.
CLASS C1 DEFINITION.
PUBLIC SECTION.
   METHODS : METH1.
PROTECTED SECTION.
   METHODS METH2.
ENDCLASS.
CLASS C1 IMPLEMENTATION .
METHOD : METH1.
   WRITE:/5 'I am meth1 in class C1'.
   CALL METHOD METH2.
ENDMETHOD.
METHOD : METH2.
   WRITE:/5 ' I am meth2 in class C1 '.
ENDMETHOD.
ENDCLASS.
CLASS C2 DEFINITION INHERITING FROM C1.
PUBLIC SECTION.
METHODS : METH1 redefinition,
meth3.
PROTECTED SECTION.
METHODS : METH2 redefinition.
ENDCLASS.
CLASS C2 IMPLEMENTATION.
METHOD METH1.
   WRITE:/5 'I am meth1 in class C2'.
   call method meth2.
endmethod.
METHOD : METH2.
WRITE:/5 ' I am meth2 in class C2 '.
ENDMETHOD.
METHOD : METH3.
WRITE:/5 ' I am own method of class C2'.
ENDMETHOD.
endclass.
START-OF-SELECTION.
DATA : OREF1 TYPE REF TO C1 ,
         OREF2 TYPE REF TO C2.
CREATE OBJECT : OREF1 , OREF2.
CALL METHOD : OREF1->METH1 ,
                OREF2->METH1.
hope it helps,
regards

Calling sub class method from superclass constructure

hi all
i have seen a program in which a super class constructure class methods of sub class before initialization of fields in subclass ,i want how this is posibble ?
thanks in advance

Hear is the code n other thing i have used final variable without initialization n compiler dosen't report error
abstract class Test
public Test()
System.out.println("In DemoClass Constructer");
this.show();
public void show()
System.out.println("In DemoClass Show() method");
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public Sub1(float n)
this.number=n;
System.out.println((new StringBuilder()).append("Number is==").append(number).toString());
int j;
public void show()
System.out.println("In Sub1 Class Show method ");
public class DemoClass
public static void main(String s[])
Sub1 obj1=new Sub1(5);
Sub1 obj2=new Sub1(6);
thanks for reply

Java Sub-Classing Error. Please Help!

I am trying to understanding some classing sub-classing and the convertion exercise. The errors appear with the code at the bottom at compilation.
HelloWorld.java:7: cannot resolve symbol
symbol : method uniqueInSubSayHello()
location: class SayHello
sh2.uniqueInSubSayHello();
^
HelloWorld.java:11: cannot resolve symbol
symbol : method uniqueInSubSayHello()
location: class SayHello
sh2.uniqueInSubSayHello();
^
class HelloWorld {
     public static void main (String args[]) {
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          SayHello sh2=subsh;
          sh2.haha();
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     int callUnique() {
          sh2.uniqueInSubSayHello();
class SayHello {
     public SayHello() {
     public void haha() {
class subSayHello extends SayHello {
     public subSayHello() {
     void uniqueInSubSayHello() {

On line 7, sh2 points to an object of type SayHello (as you assigned two lines earlier) and therefore does not know about method UniqueUnSubSayHello.
On line 11, sh2 has not been declared, since sh2 is not a variable declared globally within class SayHello. Therefore, it is not found.
Best regards,
Cemil

Exception in super and sub class

when super class method throws an exception then sub class overridden method can throws child exception but when we talk about constructor why we throws parent class exception in derived class constructor????

tcbhardwaj wrote:
C() throws Throwable // why here parent of Exception class
void ok() throws ArithmeticException // why here child of RunTimeException classFirst, you never need to declare a throws clause for unchecked exceptions--RuntimeException, Error, and their descendants.
However, there are a couple of general rules for checked exceptions (such as IOException, SQLException, etc.). As you're studying these, keep in mind that a throws clause is a contract that promises what the method will not do. In particular, it doesn't promise that the method will throw those exceptions. It promises that it will not throw any other checked exceptions not covered by that throws clause.
1. A child method that overrides a parent method cannot throw any checked exception outside what's covered by the parent's throws clause. So if the parent method declared throws IOException, the child cannot declare throws Exception, or throws SQLException, because both of those are outside the IOException "sub-hierarchy."
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Rules 1 and 2 do not apply in the case of constructors, because no constructor can ever override another constructor.
3. When any method or constructor, A, invokes any other method or constructor, B, then any checked exception declared to be thrown by B must be either caught or declared to be thrown by A. If A catches or throws a parent of an exception thrown by B, then he's also implicitly catching or throwing the one that B mentions.

Why are protected fields not-accessible from sub-classed inner class?

I ran across a situation at work where we have to sub-class an inner class from a third-party package. So, it looks something like this...
package SomePackage;
public class Outer {
   protected int x;
   public class Inner {
package OtherPackage;
public class NewOuter extends Outer {
   public class NewInner extends Outer.Inner {
}Now the NewInner class needs to access protected variables in the Outer class, just like the Inner class does. But because NewOut/NewInner are in a different package I get the following error message.
Variable x in class SomePackage.Outer not accessible from inner class NewOuter. NewInner.You can still access those protected variables from the NewOuter class though. So, I can write accessor methods in NewOuter for NewInner to use, but I am wondering why this is. I know that if NewOuter/NewInner are in the same package as Outer/Inner then everything works fine, but does not when they are in different packages.
I have to use JDK1.1.8 for the project so I don't know if there would be a difference in JDK1.2+, but I would think that nothing has changed. Anyway, if you know why Java disallows access as I have detailed please let me know.

Although I don't have the 1.1.8 JDK installed on my system, I was able to compile the following code with the 1.3.1_01 JDK and run it within a Java 1.1.4 environment (the JVM in the MSIE 5.5 browser). As long as you don't access any of the APIs that were introduced with 1.2+ or later, the classes generated by the JDK 1.2+ javac are compatible with the 1.1.4+ JVM.
//// D:\testing\SomePackage\Outer.java ////package SomePackage ;
public class Outer {
    protected int x ;
    public Outer(int xx) {
        x = xx ;
    public class Inner {
}//// D:\testing\OtherPackage\NewOuter.java ////package OtherPackage;
import SomePackage.* ;
public class NewOuter extends Outer {
    public NewOuter(int xx) {
        super(xx) ;
    public class NewInner extends Outer.Inner {
        public int getIt() {
            return x ;
}//// D:\testings\Test.java ////import OtherPackage.* ;
import java.awt.* ;
import java.applet.* ;
public class Test extends Applet {
    public void init () {
        initComponents ();
    private void initComponents() {
        add(new Label("x = ")) ;
        int myx = new NewOuter(3288).new NewInner().getIt() ;
        TextField xfld = new TextField() ;
        xfld.setEditable(false) ;
        xfld.setText(Integer.toString(myx)) ;
        add(xfld) ;
}//// d:\testing\build.cmd ////set classpath=.;D:\testing
cd \testing\SomePackage
javac Outer.java
cd ..\OtherPackage
javac NewOuter.java
cd ..
javac Test.java//// d:\testing\Test.html ////<HTML><HEAD></HEAD><BODY>
<APPLET CODE="Test.class" CODEBASE="." WIDTH=200 HEIGHT=100></APPLET>
</BODY></HTML>

How do i Index on a Sub class

Hi,
Please let me know if there is a way to index on the vairable in a sub class.
Thanks & regards,
Ebe

Hi Cameron,
The design of the Object is as follows.
Object
--- getSubObjectList() - Returns SubObjectList
----- Contains the list of SubObject
---- SubObject Contains attributes which i query upon.
Please let me know a way how to index on these attributs. Please find the code am using below
Below is the extract method of my Extractor Class
public final class ObjectGraphNavigationValueExtractor extends
AbstractExtractor implements ValueExtractor, ExternalizableLite
public Object extract(Object object) {
if(this.path.equals("attr1") || this.path.equals("attr2")){
MyObject obj =
(MyObject)object;
SubObjectList subList = (SubObjectList) obj.getSubObjectList();
Object aoExtracted[] = subList.toArray();
for(int i=0;i<aoExtracted.length;i++){
SubObject objSubObject =
(SubObject) aoExtracted;
return new BeanWrapperImpl(SubObject).getPropertyValue(this.path);
return new BeanWrapperImpl(object).getPropertyValue(this.path);
I have applied index as follows.
cache.addIndex(new ObjectGraphNavigationValueExtractor("attr1"),true,null);
cache.addIndex(new ObjectGraphNavigationValueExtractor("attr2"),true,null);
Regards,
Ebe

Instantiation of similar object over a super class deciding the sub class

Hello all
First, sorry if I'm duplicating an already answered question. I didn't searched very deep.
Initial position:
I have 2 Object (A1 and A2) which share the most (about 90%) of their instance variables an the associated methods. The values of the instance variables are retrieved in the real implementation from a stream. Depending of the data of the stream, I have to instantiate either a A1 or A2 object.
A test implementation (using an int in case of the stream):
The super class A:
package aaa;
public class A
protected int version = -1;
protected String name = null;
protected AE ae = null;
protected A()
protected A(int v)
    // Pseudo code
    if (v > 7)
      return;
    if (v % 2 == 1)
      this.version = 1;
    else
      this.version = 2;
public final int getVersion()
    return this.version;
public final String getName()
    return this.name;
public final AE getAE()
    return this.ae;
}The first sub class A1:
package aaa;
public final class A1 extends A
protected A1(int v)
    this.version = v;
    this.name = "A" + v;
    this.ae = new AE(v);
}The second subclass A2:
package aaa;
import java.util.Date;
public final class A2 extends A
private long time = -1;
protected A2(int v)
    this.version = v;
    this.name = "A" + v;
    this.time = new Date().getTime();
    this.ae = new AE(v);
public final long getTime()
    return this.time;
}Another class AE:
package aaa;
public class AE
protected int type = -1;
protected AE(int v)
    // Pseudo code
    if (v % 2 == 1)
      this.type = 0;
    else
      this.type = 3;
public final int getType()
    return this.type;
}To get a specific object, I use this class:
package aaa;
public final class AFactory
public AFactory()
public final Object createA(int p)
    A a = new A(p);
    int v = a.getVersion();
    switch (v)
    case 1:
      return new A1(v);
    case 2:
      return new A2(v);
    default:
      return null;
}And at least, a class using this objects:
import aaa.*;
public final class R
public static void main(String[] args)
    AFactory f = new AFactory();
    Object o = null;
    for (int i = 0; i < 10; i++)
      System.out.println("===== Current Number is " + i + " =====");
      o = f.createA(i);
      if (o instanceof aaa.A)
        A a = (A) o;
        System.out.println("Class   : " + a.getClass().getName());
        System.out.println("Version : " + a.getVersion());
        System.out.println("Name    : " + a.getName());
        System.out.println("AE-Type : " + a.getAE().getType());
      if (o instanceof aaa.A2)
        A2 a = (A2) o;
        System.out.println("Time    : " + a.getTime());
      System.out.println();
Questions:
What would be a better way to encapsulate the logic into their respective objects ? Is there a way to let the super class A itself identify the type of the object and then extend from A to either A1 or A2 ?
Thanks in advance
Andreas

Hello jduprez
First, I would thank you very much for taking the time reviewing my problem.
Just for the record: have you considered regular serialization? If you control the software at both ends of the stream, you could rely on standard serialization mechanism to marshall the objects and unmarshall them automatically.In my case, I can't control the other site of the stream. At the end, the data comes from a FileInputStream and there aren't objects on the other site, only pur binary data.
- It seems you have one such factory class. Then you already have encapsulated the "determine class" logic, you don't need to add such logic in superclass A.I thought from an OO view, that the super class A is responsible of doing that, but that's where the problem starts. So at the end, it's better doing it in the factory class.
- A itself encapsulates the logic to load its own values from the stream.
- A1 and A2 can encapsulate the logic to load their own specific value from a stream (after the superclass' code has loaded the superclass' attributes values).
My advise would be along the lines of:
public class A {
.... // member variables
public void load(InputStream is) {
... // assign values to A's member variables
// from what is read from the stream.
public class A1 extends A {
... // A1-specific member variables
public void load(InputStream is) {
super.load(is);
// now read A1-specific values
public class AFactory {
public A createA(InputStream is) {
A instance;
switch (is.readFirstByte()) {
case A1_ID:
a = new A1();
break;
case A2_ID:
a = new A2();
break;
a.load(is);
}The example above assumes you have control over the layout of the data in the stream (here for a given A instance, the attributes defined in A are read first, then come the subclass-specific attributes.
The outcome is: you don't have to create a new A( ) to later create another instance, of a subclass.I like the idea. In the AFactory, is the "A instance;" read as "A a;" ?
Is there a way to let the super class A itself identify the type of the object and then extend from A to either A1 or A2 ?Note I initially read this question as "can an instance of a class mutate into another class", to which the answer is no (an object has one single, immutable class; it is an instance of this class, and of any superclass and superinterface, but won't change its class at runtime).Yes, I have been thinking about a way for mutating into a subclass to keep the already initialized values from the A class without copying or parsing again. But preventing an instance of an A class will be my way. So, in this aspect, Java didn't changed in the last 10 years... It's a long time ago I've used Java for some real projects.
You can, however, create an instance of another class, that copies the values off a priori A instance. Your example code was one way, another way could be to have a "copy constructor":
public class A {
public A(A model) {
this.att1 = model.att1;
this.att2 = model.att2;
public class A1 {
public A1(A model) {
super(model);
... // do whatever A1-specific business
)Still, I prefer my former solution less disturbing: I find the temporary A instance redundant and awkward.Nice to know. I prefer the first solution too.
Thank you again for the help and advices. My mind is searching sometimes for strange solutions, where the real is so close ;-)
Andreas

Is Overloading possible in Sub class

In every book I found that Overloading means method with the same name and with different parameter define in same class.
But is possible if I define method with the same name and with different parameter in Sub class?
Like example given below :
public class OverLadingTest {
     public void test(int a, int b) {
          System.out.println("Inside test(int a, int b)");
     public static void main(String args[]){
               OverloadedSubclass overloadedSubclass = new OverloadedSubclass();
               overloadedSubclass.test(10.20,10.20);
class OverloadedSubclass extends OverLadingTest {
     public void test(double a, double b) {
          System.out.println("Inside test(double a, double b)");
Thanks in advance.

The nays have it!
package forums;
class Singularity
public void test(int a) {
    System.out.println("Singularity.test(int a)");
class Universe extends Singularity
@Override
public void test(int a) {
    System.out.println("Universe.test(int a)");
public void test(int a, int b) {
    System.out.println("Universe.test(int a, int b)");
public class OverloadingTest
public static void main(String args[]) {
    Singularity s = new Universe();
    s.test(10);
    s.test(10, 20);
compile
C:\Java\home\src\forums>"C:\Program Files\Java\jdk1.6.0_12\bin\javac.exe" -Xlint -d C:\Java\home\classes -cp c:\java\home\src; C:\Java\home\src\forums\OverloadingTest.java
C:\Java\home\src\forums\OverloadingTest.java:27: test(int) in forums.Singularity cannot be applied to (int,int)
    s.test(10, 20);
     ^
1 errorI'd say that's pretty conclusive, wouldn't you? Go read up on Java's definition of a [method signature|http://java.sun.com/docs/books/tutorial/java/javaOO/methods.html]... It's not just the name, putz!
Cheers. Keith.

How can a sub class access exisiting stage item?

i have a button on the stage. the document class loads two
sub classes. how do you get the sub class to access/work with a
stage item that is already on the display list?
as3.0 is killing me!!! grrrr...
thanks!

The document class mapDC:
package com.main{
// this is the main document class for the rextag map
appllication
// import movie clip to extend to use on stage
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import flash.events.MouseEvent;
import com.main.tools.mapTools;
public class mapDC extends MovieClip {
// instance of class
public function mapDC() {
trace("MainMap initialized");
new mapTools(stage);
public function test() {
trace("here at test");
The mapTools Class:
package com.main.tools{
// import
import flash.events.MouseEvent;
import flash.display.*;
// this class will contain all the move methods and
functions
public class mapTools {
private var stage:Stage;
function mapTools(targetStage) {
trace("Map tools initialized");
stage = targetStage;
stage.root.mapSection.eastArrow.addEventListener(MouseEvent.ROLL_OVER,testOutput);
//---------- test output function
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Abstract class sub-classing

Hi there...
I want to know whether the following is true:
"you cannot declare an object of a class, derived from an abstract class, to be null initially and then later instantiate it. you have to instantiate it right away in one statement"

REnviron = sub-class of an abstract class...
i want only one unique instance of REnviron to exist in the application.. thats why, i do:
private static REnviron uniqueInstance = null;
/* Creates a new instance of REnviron */
private REnviron() { }
public static REnviron getREnvironInstance(){
if(uniqueInstance==null) uniqueInstance = new REnviron();
return uniqueInstance;
this method (getREnvironInstance()) will only be called once in some other class.
However, when i run, the error mentioned previously is "thrown on my face"

Less dumb follow-up question about super/sub classes in WDJ?

This is a follow-up question to the question which Maksim answered in this thread:
Dumb question about super/sub classes in WDJ
Question:
Is there any kind of weird C++-like statement that you can put at the top of a WDJ module to force the module to interpret any reference to superclass A as a reference to some specific subclass B of A ???

David,
1. Java has no preprocessor, so C++ tricks are not available. Also I would not recommend such tricks even in C++ if you don't want to turn your colleagues working with same code into personal enemies.
2. The phrase "easier to create a WDJ custom class loader " makes me smile. First, it's not that simple to interfere WDJ class loading scheme. Plus custom class loaders is not trivial Java topic per se.
3. The problem "replace all A-s with B-s" is typically solved using one or another GoF creation patterns, like <a href="http://en.wikipedia.org/wiki/Abstract_factory_pattern">Abstract Factory</a> or <a href="http://en.wikipedia.org/wiki/Factory_method_pattern">Factory Method</a>. You may use them with custom class loader, if you really want to
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Valery Silaev
SaM Solutions
http://www.sam-solutions.net

Method of JUErrorHandlerDlg sub class

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