When should I use validate(), reValidate, and inValidate()?

When should I use validate(), reValidate, and inValidate()? Also, I would like some detailed differences on them.
Virum

Anyone?

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When should I use static variable and when should not? Java essential

When should I use static variable and when should not? Java essential

Static => same value for all instances of the class.
Non-static => each instance can have its own value.
Which you need in which circumstances is completely up to you.

When should I use abstract classes and when should I use interfaces?

Can any body tell me in which scenario we use /we go for Interface and which scenario we go for abstract class, because as per my knowledge what ever thing we can do by using Interface that thing can also done through abstract class i mean to say that the
behavior of the two class.
And other thing i also want to know that which concept comes first into the programming abstract class or Interface.
S.K Nayak

The main differences between an abstract class and an interface:
Abstract
An abstract class can contain actual working code (default functionality), and can have either virtual or abstract method.
An abstract class must be sub-classed and only the sub-classes can be instantiated. Abstract methods must be implemented in the sub-class. Virtual methods may be overridden in the sub-class (although virtual methods typically contain code, you still may
need/want to override them). A good use for an abstract class is if you want to implement the majority of the functionality that a class will need, but individual sub-classes may need slightly different additional functioality.
Interface
An interface only contains the method signatures (method name and parameters), there is no code and it is not a class.
An interface must be implemented by a class. An interface is not a class and so it cannot be sub-classed. It can only be implemented by a class. When a class implements an interface, it must have code in it for each method in the interface's definition.
I have a blog post about interfaces:
http://geek-goddess-bonnie.blogspot.com/2010/06/program-to-interface.html
(sorry, I have no blog posts specific to abstract classes)
~~Bonnie DeWitt [C# MVP]
http://geek-goddess-bonnie.blogspot.com

When should a subclass have its own fields and when should it use its super

When should a subclass have its own fields and when should it use its superclass' fields?
Hi, thank you for reading this post!
Let me use a specific example to ask my question.
public class BankAccount {
     private double accountBalance;
     public double getBalance() {
          return this.accountBalance;
public class SavingsAccount extends BankAccount {
     private double accountBalance;
     public double getBalance() {
          return this.accountBalance;
}In the bank account example, both BankAccount and SavingsAccount will have a method getBalance(). Therefore, they
both require a account balance field. My question is since getBalance() for both classes will perform the exact same
operation, when should I omit declaring the getBalance() method and the accountBalance field in the subclass, and
when should I include them?
My own thought is when we never have to instantiate a superclass object (e.g. an abstract class), then we place
common fields in the abstract superclass and have subclasses access these fields via protected getter/setters to
access the superclass' fields. This is the principle of reuse.
But when you do need to instantiate a superclass and the superclass does need to maintain its own fields, then
I would need to duplicate the accountBalance field and getBalance() method in the subclass.
Is my thinking correct or incorrect?
Thank you in advance for your help!
Eric
Edited by: er**** on 22-Aug-2011 20:19

er**** wrote:
If SavingsAccount inherit BankAccount.getBalance()...getBalance() would return BankAccount's accountBalance. This is NOT the correct result we want.Actually, I think it's precisely what you want.
We want getBalance() to return BankAccount's accountBalance when we use a BankAccount object, and SavingsAccount's accountBalance when we use a SavingsAccount object.I seriously doubt that. I think you're confusing a BankAccount with a Customer, who can have more than one account.
In every system I've ever seen, a SavingsAccount IS-A BankAccount - that is to say, it's a genuine subtype. Now, it may well contain other fields ('interest'?) that a normal account wouldn't, but 'balance' ain't one of them.
Winston

What are the mapfiles for and when should I use them?

Hi,
what are the map files for and why/when should I use them?
/usr/lib/ld/map.noexstk
usr/lib/ld/map.noexbss
/usr/lib/ld/map.noexdata
/usr/lib/ld/map.pagealign

Hi, I'm sure you've read the comments, but for the benefit of those who haven't: /usr/lib/ld/map.noexstk # Linker mapfile to create a non-executable stack definition within an # executable. /usr/lib/ld/map.noexbss # Link-editor mapfile to create a non-executable bss segment definition # within an executable. /usr/lib/ld/map.noexdata # Link-editor mapfile to create a non-executable data segment definition # within an executable. These stop the various segments from being executable. Which could reduce the risk surface for exploiting security holes in an application. /usr/lib/ld/map.pagealign # Linker mapfile to create page-aligned data within an executable. Aligning the start of the data segment can reduce the number of TLB entries needed to map the data. So the smallest TLB page size is 8KB, then we have 64KB, then 4MB etc. If the data starts on a 4MB boundary then it can be mapped with 4MB pages, if not then it has to be mapped with 8KB pages until a 64KB boundary, then 64KB pages until we get to a 4MB boundary. You sometimes get a bit of performance from this, but you may also get performance stability from it. If the mapping is random sometimes it works well, sometimes it works less well. Regards, Darryl.

What is the difference between saving to "Documents" and "Macintosh HD" and when should you use each one?*

What is the difference between saving to "Documents" and "Macintosh HD" and when should you use each one?

When you save to the folder with the little house icon, the file is placed at
/Users/your_user_name/
You would really have to go out of my way to save at:
(the shortcut for the Boot Drive, regardless of its name).
I am not sure how you decided that Time Machine is not saving your files. The default is for Time Machine to do incremental Backups of everything on all attached drives, except for certain temporary information in Cache files. If you have four Users, Time Machine will back them all up.
Looking at the raw Time Machine backups will tell you very little, because it does lots of its work with Hard Links, and because it does incremental backups, so only files that changed since the last Backup are saved at thet cycle. The way to determine whether Time Machine is saving things is to display the window you care about in the Finder, then invoke the "Star wars"/ "Back, back, back in time" Interface.

HT4060 Is it normal for someone to have general diffuculty charging an ipad? I see the "not charging" message even when I am using the charger and cord that came in the original box, plugged into a wall socket directly. It just seems to be exceedingly f

Is it normal for someone to have general diffuculty charging an ipad? I see the "not charging" message even when I am using the charger and cord that came in the original box, plugged into a wall socket directly. It is normal for me to plug it in overnight and to see no charge whatsoever the next day. I have never had so much trouble using a friggin charger in my life. It just seems to be exceedingly finicky. What am I missing?

Charging your iPad should not be problematic. It should be an easy thing to do using the charger provided with your iPad connected to a known good wall outlet.
The charging problem you are experiencing is most like caused by:
1. A faulty charger
2. A faulty cable
3. A bad wall outlet
4. A problem in the iPad.
The first three of these are easiest to eliminate. Try a for ends charger and cable. Make absolutely sure your outlet is good. Try other outlets.
If the charger, cable and outlet a proven to be good then the problem lies in the iPad.
Make an appointment at an Apple Store to have your device examined by a technician. Or contact Apple Support.

J1INCHLN when should I use error control mode checkbox

Hi Experts,
I am using t-code J1INCHLN for creating remittance Challan.
But in ECC6, EHP 5 there is new functionality added & no documentation available for same.
There is one field with tick option called Error Control Mode.so when should i use this functionality.
Can anyone help on this?
Thanks and Regards,
Sameer

HI
Please refer the note no : 1567443
Manual Control in J1INCHLN to change currency key/doc type
"After this, if you will run J1INCHLN, you will get a checkbox at the end
with 'Error Control Mode' which will be selected by default. If you want
to change document type, currency or rate during processing, you should
uncheck it else it will take you to the last screen."
I hope note is allready available in your system hence you are getting above cheeck box.
If you want to change the document type and currency or rate during posting then you need use the check box.
Regards
Madhu M

Can anyone list problems/errors when uploading data using BDC's and BAPI's?

Can anyone list the problems/errors when uploading data using BDC's and BAPI's?

Hi,
If you are actually creating a BDC to load data pls be more specific.
Data format incorrect. Tab delimited/ etc
Dates in wrong formats
Currency incorrect formats
Missing screens
Wrong transaction code
File not found,
Missing Mandatory fields,
Screen resoultion.
You should always use refresh for your Bdcdata table.
Loop at internal table.
refresh Bdcdata.
regards,
sowjanya.

Why or When should we use Execute Immediate in PLSQL??

Hi Frnds,
Long Ago i have received a interview question that ...
How can U create a table in the PLSQL object(Function or procedure)?
But the thing y should we use execute immediate?
In which scenario we should we should use????????????
Why or When should we use Execute Immediate in PLSQL????

OR
http://stackoverflow.com/questions/18375990/oracle-what-does-execute-immediate-means
For DML you'd use it when running statements that you don't have available at compile time, e.g. if the column list is based on a selection from the user.
In your case it's being used because DDL cannot be run as static SQL from within PL/SQL. Only certain query, DML and TCL commands are valid. Anything else has to be treated as dynamic.
I'd say it's rare to need to use DDL from a PL/SQL block. TRUNCATE might be reasonable; if you find anything creating or dropping objects on the fly then that might be more of a concern as it can suggest a suboptimal data model.
EXECUTE IMMEDIATE itself does not automatically commit; but if you execute DDL then that will behave the same as if you ran it outside PL/SQL, so it will commit in your case, yes.
Incidentally, I'm not sure why your code is using an intermediate variable to hold the statement; that's useful if you want to display what it's going to run maybe, but you don't seem to be doing that. What you have could be done as:
EXECUTE IMMEDIATE 'TRUNCATE TABLE BD_BIDS_EXT_DET';
Thank you

Wheel of doom spinning before I can log into the pro. Never happened before. The wheel spun a lot when i was using it yesterday and slowed down usage

wheel of doom spinning before I can log into the pro. So signing in was a panic attack in itself.
Never happened before.
The wheel has started to show up spun a lot when i was using it yesterday and slowed down general usage.
what is happening to the mac and what can I do to bring it back to life (before the rainbow wheel of doom)

If this has started happening suddenly without your having made any changes to your configuration, the it's likely that the boot drive is failing, or that there's some other hardware fault. Back up all data immediately, then run the Apple Hardware Test.
Intel-based Macs: Using Apple Hardware Test
Even if the test is negative, you should make a "Genius" appointment at an Apple Store to have the machine tested more thoroughly.

When should you use dmg vs copy or duplicate

When should you use dmg vs copy or duplicate

Your answers are very helpful. They encourage me to ask the more complete and complicated question: we have a web site that was developed using iWeb several years ago. iWeb support was dropped by Apple some years ago and we moved the site to GoDaddy, but still using the iWeb software. Now we have only 1 computer which can continue to edit, add to and support our web site. Our aim is to copy as much of our material as we can so that when this computer finally dies we can salvage as much of our material as we can to resurrect our site once more. GoDaddy says they cannot help us.
Here is my wife's web site:
www.adajillschneider.com
Thanks for all your time and help.
Ron Schneider

When Should I use the Inner Classes ?

When Should I use the Inner Classes ?
What is the advantage(s) and the disadvantage(s) ?

When I use innerclasses?
1) Allmost allways when I need simple owner child behavior.
2) When I need a behaviour, that is quite small, and used only once, I make it anonymous inner class. For example specialised streams and threads.
3) Enumerations

When should one use final arguments?

Hi all,
When should one use final arguments?
I have searched the forum for this, but couldnt find a precise answer. I am specifically looking for cases where they are:-
1. the only way to acheive something
OR
2. the stylistic way to acheive something.
Thanks,
Binil

My $0.02 - I don't think (practically) you ever need
final method parameters (it's not like they prevent
subclassing or anything). However, I think (stylistically)
you should make method parameters final wherever you
can - it makes the code a more explicit (the contract
between the invoker and the invokee is clearer).
I seem to recall something about JVMs being able to
optimize methods with final parameters better too, but that might just be moonshine or more people would
(probably) be going on about it.

HT4571 When should I use data roaming?

When should I use data roaming?

When you are outside your carrier's network, you may be able to access the Internet using another wireless carrier, that's dataroaming.
More info; http://support.apple.com/kb/HT1976

When should I use validate(), reValidate, and inValidate()?

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