Question about overridden method error

Hello everyone, I have a silly problem which im sure is elementry, but alas still I cannot work it out.
I have a test class as below
import android.os.Handler;
public class Test extends Handler{
       @Override
       public void handleMessage(Message msg){
       @Override
       public String toString(){
               return "hi";
}Eclpise dosent reconise handleMessage as a superclass method, says i should remove the @Override notation. This method has been in all Android SDKs as far as i am aware (see it here [http://developer.android.com/intl/zh-CN/reference/android/os/Handler.html|http://developer.android.com/intl/zh-CN/reference/android/os/Handler.html], i just dont get why it wont let me do this.
Any help would be great
ps i have also posted this on the anddev forum, but i m sure someone will very quickly point out my stupidity ( i hope so )

ok, im an idiot, but i suspected that anyway,
eclispe wasent highlighting the Message class name, which i hadnt imported, therefore the method was not being reconised!
Sorry :)
Edited by: Sir_Dori on Nov 4, 2009 1:55 PM

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Question about undefined method error

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ok, im an idiot, but i suspected that anyway,
eclispe wasent highlighting the Message class name, which i hadnt imported, therefore the method was not being reconised!
Sorry :)
Edited by: Sir_Dori on Nov 4, 2009 1:55 PM

A question about a method with generic bounded type parameter

Hello everybody,
Sorry, if I ask a question which seems basic, but
I'm new to generic types. My problem is about a method
with a bounded type parameter. Consider the following
situation:
abstract class A{ }
class B extends A{ }
abstract class C
 public abstract <T extends A> T someMethod();
public class Test extends C
 public <T extends A> T someMethod()
 return new B();
}What I want to do inside the method someMethod in the class Test, is to
return an instance of the class B.
Normally, I'm supposed to be able to do that, because an instance of
B is also an instance of A (because B extends A).
However I cannot compile this program, and here is the error message:
Test.java:16: incompatible types
found : B
required: T
 return new B();
 ^
1 errorany idea?
many thanks,

Hello again,
First of all, thank you very much for all the answers. After I posted the comment, I worked on the program
and I understood that in fact, as spoon_ says the only returned value can be null.
I'm agree that I asked you a very strange (and a bit stupid) question. Actually, during recent months,
I have been working with cryptography API Core in Java. I understood that there are classes and
interfaces for defining keys and key factories specification, such as KeySpec (interface) and
KeyFactorySpi (abstract class). I wanted to have some experience with these classes in order to
understand them better. So I created a class implementing the interface KeySpec, following by a
corresponding Key subclass (with some XOR algorithm that I defined myself) and everything was
compiled (JDK 1.6) and worked perfectly. Except that, when I wanted to implement a factory spi
for my classes, I saw for the first time this strange method header:
protected abstract <T extends KeySpec> T engineGetKeySpec
(Key key, Class<T> keySpec) throws InvalidKeySpecExceptionThat's why yesterday, I gave you a similar example with the classes A, B, ...
in order to not to open a complicated security discussion but just to explain the ambiguous
part for me, that is, the use of T generic parameter.
The abstract class KeyFactorySpi was defined by Sun Microsystem, in order to give to security
providers, the possibility to implement cryptography services and algorithms according to a given
RFC (or whatever technical document). The methods in this class are invoked inside the
KeyFactory class (If you have installed the JDK sources provided by Sun, You can
verify this, by looking the source code of the KeyFactory class.) So here the T parameter is a
key specification, that is, a class that implements the interface KeySpec and this class is often
defined by the provider and not Sun.
stefan.schulz wrote:
>
If you define the method to return some bound T that extends A, you cannot
return a B, because T would be declared externally at invocation time.
The definition of T as is does not make sense at all.>
He is absolutely right about that, but the problem is, as I said, here we are
talking about the implementation and not the invocation. The implementation is done
by the provider whereas the invocation is done by Sun in the class KeyFactory.
So there are completely separated.
Therefore I wonder, how a provider can finally impelment this method??
Besides, dannyyates wrote
>
Find whoever wrote the signature and shoot them. Then rewrite their code.
Actually, before you shoot them, ask them what they were trying to achieve that
is different from my first suggestion!
>
As I said, I didn't choose this method header and I'm completely agree
with your suggestion, the following method header will do the job very well
protected abstract KeySpec engineGetKeySpec (Key key, KeySpec key_spec)
throws InvalidKeySpecException and personally I don't see any interest in using a generic bounded parameter T
in this method header definition.
Once agin, thanks a lot for the answers.

Question about static method hiding

I undestand that a static method may only be hidden in a subclass not overridden. But, I don't understand why an exception type thrown by the subclass method must be a subtype of the exception type thrown by the superclass method. For example,
public class A {
public static void foo() throws ExceptionA { }
public class B extends A {
public static void foo() throws ExceptionB { }
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Thanks,
Tim

I don't understand your point. In either case, static
or non-static, ExceptionB must be the same or a
subclass of ExceptionA. My question is why this
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Hello All,
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Reddy:
<ol>
<li>it can be run daily basis, which should select all idocs which are in status 51 with message number (..related to wrong material number). report output should inlcude :idoc number-wrong mat no- space for new material to be entered by business against wrong 1. And there should be one button for RUN.</li>
<li>After RUN, the material number should be changed to new 1 in segments and idocs should be reprocessed.</li>
<li>repeat the run until business enter right mat num.</li>
</ol>
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Hello Berthold,
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John
PS Release 7 (SAPK-70004INSCEMSRV pack level)
Edited by: John D Norman on May 6, 2010 2:00 AM

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hello, chris:
we got some errors about cache group :
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The Question about mess "Customizing Error in Work Schedule Rule ..."

Dear all,
I run the Start-Payroll and I getting an error " Customizing Error In WSR for that Personal Number"
I configuration all of Time Management with start date is 01.01.2000 and when I run Payroll on Payroll period is 01/2000 with start date is 01.01.2000 to 31.01.2000 for Employees hiring on 01.01.2000 then I have an error " Customizing error in work schedule rule .. .. ... ..".
But I can run the payroll period on 02/2000 with start date is 01.02.2000 to 29.02.2000 for Employees hiring on 01.02.2000. form 02/2000 it is okies.
Please help me solve about my problem
Thank for your answers
Regds
Huyen Nguyen

Customizing Error in Work Schedule Rule
where are u getting this error
if it is PY log
Check GENPS this error will come under this Function
it is the combination of
ur Holiday calendar
Employee Sub Group
Personal Sub area Grouping
and ur Daily work Schedule Rule
Check the Start dats an end dates fo all the above Settings along with their Groupings in table V_T508A

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I do hope that you are getting my point.
I tried like this:
TextArea.selectInputMethod( new Locale("SIMPLIFIED_CHINESE"));
But it gives me error that "cannot find method selectInputMethod()".
I shall be very very very thankfull to you.
Thanx
..::DW

Yeh, it would be simpler to run a test, but i'm not at a workstation with a jdk or IDE at the moment!
Thanks for the response though!

Simple question about tabular forms: error in MRU

hi to all,
i write here to check if what i think about tabular forms is confirmed.
If i build a master- detail or tabular form and the underlying table are modified, the page where the tabulare form is contained doesn't work anymore.
if what i've written above is correct, is there a way to realign the fields of the tabular forms to the db fields and make my page work again without rebuilding all?
Can i modify something, somewhere inside apex to make my page run again?
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Error in mru internal routine: ORA-20001: Errore in MRU: riga= 0, ORA-20001: ORA-20001: La versione corrente dei dati nel database è cambiata da quando l'utente ha iniziato il processo di aggiornamento. checksum corrente = "ED73B05FA6016F8D5F3B4B5B69AF482D", checksum elementi = "CFD72DCC4221A340057D654B54EA7A04"., update "NEWPROJ"."CNT_VAL_SEG_DEMO" set "ID" = :b1, "FK_CNT" = :b2
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By the way this sentence under my opinion can trick you as
in italian 'La versione corrente dei dati nel database'
can means both that data contained in tables have changed (dml error / process error / data the user see not are the real underlying data). Can mean as well the field definition is changed, however a more meaningful message in italian is: ' la definizione delle tabelle usate dall'oggetto tabular form é cambiata'.
That translated in english is ' DDL of table/s used by tabular form has changed'.
thanx a lot
Message was edited by:
Marcello Nocito

HI Heinz,
yes is now clear, however is a pity that a litte change in the query has a lot of
implications: a change in the structure of DB means new feature / the data model is not alligned with current requirement. So usually (but not always) it means changing the SELECT as well.
Such Apex is a Rad an impression is that if you build a complex forms with several linked reports / field and one day you have to change the query of the TABULAR FORM / MASTER DETAIL generated with report you get a lot of rebuilding.
I think i will avoid the use of this 2 object in the future and use more htmldb.items in the select.
bye bye

Newbie question about abstract methods

hey, I'm working on a web application that I was given and I'm a little confused about
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how this post method works if the method it's calling is declared abstract. Could someone please tell me how this works?
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protected abstract boolean authorizeGet();Thanks
Edited by: saru88 on Aug 10, 2010 8:09 PM

Abstract Methods specify the requirements, but to Implement the functionality later.
So with abstract methods or classes it is possible to seperate the design from the implementation in a software project.
Abstract methods are always used together with extended classes, so I am pretty sure that you are using another class.
Btw: Please post the Code Keyword in these brackets:

Question about changing method signature

Hello. I've inherited some code which contains a method with the following signature:
foo(int x, MyObject myObject)
Okay, so that's not really the exact signature :) In any case, I need to modify the signature to:
foo(int x, Object myObject)
I believe that I can do this without affecting any existing client code because Obect is a superclass of MyObject. Is that right or must I deprecate the first version and add the second separately? Whatever, happens I can't break code which was compiled against the old version. Thanks in advance.
-jason

That's a good point. It's probably not an issue
however as we don't provide (supported) access to our
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Hi
I have some text data that i need to encrypt and save to a file (kind of a licence file). Than that file is distributed with the software. Upon runtime the software should be able to read in that crypted data file and decrypt it so it can read the information for use.
I know how this is done using DES for example. But with DES i have to distribute the DES Key with the software, so everbody could use that key to create new encrypted data files.
What i'm looking for is something like a key i can use to encrypt the data and another key that can only be used to decrypt the data but not for encrypting it, so i can destribute that key with the software with out the danger that anybody can use that key to create new data (licence) files.
Is there a cryptography mehtode to do this? If yes, is that methode available in JCE?
I'm a newbie to crypthography, i just read little about the basic concepts, so i'm very thankful about your help.

I'm not sure whether i understand what you mean. I don't see a reason why i have to exchange any kind of data with the client.
i thought i package the public key and the encrypted data file with the software i distribute. Than, upon runtime the software loads the public key (as a serialized object) and the encrypted data file and decryptes the data file.
But this just fits my needs, if the public key may just be used to decrypt the crypted data file and not for encryption. I'm a little bit confused about this point, because i read a lot in the past hours about this topic and the statement was, that private keys are used to decrypt and public keys are used to encrypt. So what i need is the opposite. And i couldn't find such an algorithm until know.
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Question about functions methods and variables

Sorry but i couldn't figure out a better title.
When does a method alter the variables it gets directly and when does a method just alter a clone of the variables it gets?
How about a funcion?
for example:
public void (int i)
i = 4;
sometimes this method alters the integer which was given to it directly and sometimes it automatically creates a clone of the integer and alters that one. I just can't figure out why a method would do the first or the second.
Im trying to achieve the direct changeing of the given variable without creating an unessecary clone.
Thank You

Comp-Freak wrote:
Sorry but i couldn't figure out a better title.
When does a method alter the variables it gets directly and when does a method just alter a clone of the variables it gets?
How about a funcion?
for example:
public void (int i)
i = 4;
sometimes this method alters the integer which was given to it directly and sometimes it automatically creates a clone of the integer and alters that one. I just can't figure out why a method would do the first or the second.
Im trying to achieve the direct changeing of the given variable without creating an unessecary clone.
Thank YouThats quite all right about the title, trust me we get much worse titles on this forum. Most of the time to the effect of "Plz urgentlly!!!!111one"
In Java, all variables passed into methods are passed by value, which means that if I pass an int variable to a method, that methods argument will always be a seperate variable. There is no way to pass variables by reference so that you are altering the original variable you passed in.
It actually works the same way for reference variables that point to a particular object.
public Object o = new Object();
methodOne(o);
public void methodOne(Object oArg) {
o == oArg; //true
}It is essentially the same in this case, there are two seperate reference variables here, o and oArg is created once the method is called. There is only one Object created however and both reference variables point to it, so an == check will verify this that it is true.

Question about overridden method error

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