Overloaded methods-yes or no & is this a good practice

say i have two methods with the same name that take in the same parameters and have the same return type. the difference between the two is that one is static while the other is not. Also the methods contain different codes.
are the methods going to function normally when i use em? also if they do function normally, is this essentially a good practice?
if code is needed to answer this, please do mention it and i will think of a mini scenario where this can be applied and write a small piece of code for that.
thanx. help will be appreciated.

avi.cool wrote:
duffymo wrote:
each account has its own password that the user sets when the account is created-this password is declared as a state variable in the class file. One password per account? A bad model, IMO. My on-line banking software associates credentials with me, not my accounts. I see several accounts when I log in, and I don't have to log in individually for each one.
besides that, theres also a bank password-this is declared and initialized as a static state variable in the class file. some of the operations require the bank password for access while others require account password.Static bank password? I'm very glad this is a throw-away student exercise, because you have no idea what you're doing.hahaaa, tru tru, its for a skool assignment for my first ever programming course. though not a throw away, i putting a lot of work into this :-) i m not actually trying to resolve any security issues here or strengthen account security. basically, I am only trying to exhibit a tiny bit of creativity while showing understanding of course contents. so nothing to stress on :-D i know not very creative but its all i got at this stage.
i was trying to exhibit the use of overloaded methods in my program by having method to check the password that the user enters to access operations.
now the ones that require account password, i was thinking of having the password check method as a non-static method since its associated with the object.
while the ones that need bank password, i wanted to have as static method.
i wanted both methods to have the same name.You've no idea what you're doing.
how i solved it,
i decided on having both methods as static methods. the one that checks account password, takes in two parameters, the account name(object name) and the string to be checkd. the one that checks bank password, takes in only one parameter- the string to be checked.Wrong.i would be really thankful if you could help me rectify my mistake and advice on how i should be doing this. is there a conceptual error? i am a bit confused now.
Its exactly what I told you.. but now, you just have to come on here and post this :p
and isn't this sort of like cheating? :P I mean this IS our exam you know... You're basically asking other for the arithmetic and logic lol.

Similar Messages

Is this a good practice

v_date varchar2(20);
begin
select
    to_char(sysdate,'dd_mon_yyyy')
into
    v_date
from
    dual; found this here
http://www.orafusion.com/art_excel.htm

I'm not sure that I understand what you're asking?
If you really need a string representation of a date, I'd certainly prefer the simpler
v_date := to_char(sysdate,'dd_mon_yyyy');syntax. But I'm not sure that's your question
- I wouldn't want to name a variable that holds a date representation of a string V_DATE. The name of the variable implies that it should be a date not a string.
- I generally would want to avoid converting a date to a string anywhere other than my presentation layer.
- Depending on your internationalization/ globalization settings, I might want to be explicit about my NLS settings in the TO_CHAR call since MON will return different strings depending on the client's NLS settings.
Justin

[b]Is this a good a pricatice????[/b]

Hi All,
I am currently working on a new project and I just wanted to make use of DAOs and Singletons.
I just wanted to make sure that what I am doing correct and that it would not cause any problems in the future.
Here is what I am doing..
1. I moved all my data base interactions into just one class (UserDAO.java).
2. I created a factory class ( UserDAOFactory.java ) to make use of singleton.
And this is what I am doing in the Factory calss
public class UserDAOFactory {
     private static userDAO cdDAO;
     public static UserDAO getInstance()
               //For lazy initialization
               if(userDAO == null){
                    userDAO = new UserDAO();
               return userDAO;
Is this a good practice??
Since I made "userDAO" as a static variable just wanted to know how would it affect me in the future and what precautions should I take??
I will really apprecaite any help, ideas and thoughts in this regards and I am a little new to this
TIA,
CK

If the Singleton requires lots of resources but may
not be used in a given execution of a program. For
example let's say you have some kind of advanced
screen in your text editor. When it opens up it
takes a while to load, lets say 30 seconds. If you
do this at startup, you added 30 seconds to startup
for something that may not even be used.I agree in principle, but I've never seen a Singleton that took that long to start up. It's like Bigfoot: there are stories out there, but I've never seen one.
The good news is that normally, the 'lazy'
instantiation and the static initialization generally
occur at the same time, the first time the
getInstance method is called.Not very lazy, then.
However, some environments will load a class before
it is referenced. Sometimes this can cause fatal
errors (I have dealt with this.)
We had singletons
that ran on an app-server (I know you are not
supposed to do this.) When the server came up, it
would load the class. However, the required
resources were not ready and the singleton wouldn't
initialize properly. So the 'lazy' version was
required.Okay, I see. Thank you.
This still doesn't fix double checked locking. Making it thread safe seems impossible.
%

Overloading methods that do logically different things, does this break any major principles?

This is something that's been bugging me for a bit now. In some cases you see code that is a series of overloads, but when you look at the actual implementation you realize they do logically different things. However writing them as overloads allows the caller
to ignore this and get the same end result. But would it be more sound to name the methods more explicitly then to write them as overloads?
public void LoadWords(string filePath)
var lines = File.ReadAllLines(filePath).ToList();
LoadWords(lines);
public void LoadWords(IEnumerable<string> words)
// loads words into a List<string> based on some filters
Would these methods better serve future developers to be named as LoadWordsFromFile() and LoadWordsFromEnumerable()?
It seems unnecessary to me, but if that is better what programming principle would apply here?
On the flip side it'd make it so you didn't need to read the signatures to see exactly how you can load the words, which as Uncle Bob says would be a double take. But in general is this type of overloading to be avoided then?

Hi PandoraElite,
>>Would these methods better serve future developers to be named as LoadWordsFromFile() and LoadWordsFromEnumerable()? It seems unnecessary to me, but if that is better what programming principle would apply here?
I think you could define a class with many complex behavior, and the behavior has the same method name with different parameters like below:
//difine the class
public class LoadClass
public void LoadWords(string filePath)
//add method
MessageBox.Show("string");
public void LoadWords(IEnumerable<string> words)
// loads words into a List<string> based on some filters
MessageBox.Show("IEnumerable<string> words");
//use the class
string str = "hello";
List<string> list = new List<string> { "h","e","l","l"};
TestClass.LoadClass loadclass = new TestClass.LoadClass();
loadclass.LoadWords(str);
loadclass.LoadWords(list);
>>On the flip side it'd make it so you didn't need to read the signatures to see exactly how you can load the words, which as Uncle Bob says would be a double take. But in general is this type of overloading to be avoided then?
I think it would be better not to use the “LoadWords(lines)” in the “public void LoadWords(string filePath)”. When you modify the “LoadWords(IEnumerable<string> words”, it would affect the “LoadWords(lines)” method and the function of the “LoadWords(lines)”method
might be effected.
Best Regards,
Edward
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Overloaded methods in stack trace

There is a thing I thinking about.
When I have overloaded methods and I want to check a stack trace where one of these overloaded methods take part I cannot decide which method was in the frame, unless I have the source and have debug information in the class file.
It's not so painful because in most cases people have source code and compile with debug option if they need it, and so the method can be looked up.
Although, it makes harder to implement runtime test or error processing tools, which works upon stack trace elements. Methods could be annotated with version, author, date and other pieces of information. Runtime test or error processing tools could read and process these annotations.
Current StackTraceElement implementation makes this possible by using Reflection, while there are no overloaded methods in the stack trace.
It would be great to include some method into the StackTraceElement which return types of parameters of the stacked methods.
What's your opinion about this?
Here is a short source which demonstrates the problem:
public class Test {
     public void a() { throw new NullPointerException(); }
     public void a(int i) { throw new NullPointerException(); }
     public static void main(String[] a) {
           Test t = new Test();
           Random r = new Random(System.currentTimeMillis());
           if(r.nextBoolean()) t.a(); else t.a(0);
}I can't decide if a() or a(int) was invoked if I dont' have the source or haven't got debug info (line numbers).

I guess it would be quite useful in certain cases.
Let's say we make (runtime readable) annotations on methods with author, version and modification date information.
When we have an exception stack trace with exact information about concerned methods, we have all information to create and dispatch automatically an error report to the responsible persons based on annotations.

Overloaded methods question

I guess I don't understand overloaded methods as well as I thought I did, because I'm confused about some behavior I'm seeing in my Java program. Here's a sample program that I wrote up to demonstrate the issue:
public class Polymorphism
     static class Shape
          public void test()
               System.out.println( "In Shape" );
     static class Rectangle extends Shape
          int height, width;
          public Rectangle( int height, int width )
               this.height = height;
               this.width = width;
          public void test()
               System.out.println( "In Rectangle" );
          public boolean equals( Rectangle rect )
               return ( height == rect.height ) && ( width == rect.width );
     public static void main( String[] args )
          Shape shape = new Rectangle( 5, 7 );
          shape.test();
          Shape shape1 = new Rectangle( 3, 4 );
          Shape shape2 = new Rectangle( 3, 4 );
          System.out.println( shape1.equals( shape2 ) );
          System.out.println( ((Rectangle)shape1).equals( shape2 ) );
          System.out.println( shape1.equals( (Rectangle)shape2 ) );
          System.out.println( ((Rectangle)shape1).equals( (Rectangle)shape2 ) );
}And the output looks like this:
In Rectangle
false
false
false
trueThe first call to "test()" calls the Rectangle's test method, as I would have expected. This happens despite the fact that shape is declared as a Shape.
Here's where I get confused. I would have thought the next four calls to println would have output "true" every time, because shape1 and shape2 are Rectangles, hence, I would have expected that Rectangle's "equals()" method would have been called each time. But apparently it's only being called in the last case, when I cast both shape1 and shape2 to be Rectangles. (Presumably, Object.equals() is being called, and it's appropriately returning "false" because the objects are not the same instance.)
So this behavior seems inconsistent to me. Why did the first call to "test()" invoke Rectangle.test() even though I declared it as a Shape, yet the succeeding calls to shape1 invoke Shape.equals() rather than Rectangle.equals(), despite the fact that the objects are truly Rectangles?
Can anyone explain this to me, or point me to a tutorial that would describe this behavior?
Thanks.

Case 1 and Case 2 seem analogous to me, yet their
behaviors are different. (There is one difference
between the two cases, and that is that in case 1 I'm
overriding the test() method, while in case 2 I'm
overloading equals(). Overriding vs. overloading.
Though clearly these are different concepts, I guess
it never would have occurred to me that whether a
method was overridden vs. overloaded made such a
difference in how invocation worked.)You're right: it's the diffference between overriding and overloading.
I'll try to formulate it differently:
At compile-time, the compiler, based on the declared type of the Object the method's called on, and based on the declared types of the arguments, determines which method'll get called (a method is defined by its name and its signature. I don't think the return type matters in this context).
In the test() case, the compiler looks for a method in class Shape and finds: test().
In your "third case", the compiler looks for a method named "equals" in class Shape with the argument type: "Rectangle", finds none, so it takes: equals(Object)
At runtime, the method is looked for in the Object it's invoked on, that is a Rectangle.
In the test() case, it looks for the method: test(). Since that is declared in the Rectangle class, it takes the overridden method.
But in the "third case", there's no equals(Object) method, so it takes the super.
So I apologize if no one can think of a way to make
this clearer to me, but I still have some subtle
confusion on the issue.It is a confusing topic. That's why I pointed out itchyscratchy's reply, who made a good point telling to avoid having to rely on overloaded methods generally. Overriding is complicated enough.

Overload methods error in web services

Hi Experts,
We want to invoke a DotNet web service. The dotnet web service contains overload methods. When I try to invoke this web service from WSNavigator, it shows "WSDL Operation with name search is overloaded (defined twice). Operation overloading is not supported by proxy generator" error. How to solve this issue?
Best Regards
Tom

Hi Tom,
TO use overloaded methods u have to specify Message Name property.Find the example.
Here method say() is overloaded
[webMethod]
public string say()
    return "hello";
[web Method]
public string say(string p_Name)
    return "Hello " + p_Name + "!";
Adding the Message name property.
[WebMethod]public string say()
    return "hello";
[WebMethod (MessageName="WithOneString")]
public string say(string p_Name)
    return "Hello" + p_Name + "!";
Regards,
Sri.
Edited by: Srikanth Thatipally on Feb 27, 2009 3:33 PM

Polymorphism with Overloaded Methods

I am running into a problem when I try to leverage java��s polymorphism with overloaded Methods. Basically, what I am trying to do is iterate through a generic list of properties and call the correct overloaded method on each one based on the type of containing object.
Here is the general code (4 classes)
AbstractCronJob �� EmailCronJob
BaseProperty �� SubjectLineProperty
public abstract class BaseProperty implements CronPropertyExecutable{
    public BaseProperty() {
        super();
   public void execute(AbstractCronJob job) {
       System.out.println( "executing on abstract cron job" ) ;
public class SubjectLineProperty extends BaseProperty {
    public SubjectLineProperty() {
        super();
    public final void execute( EmailCronJob emailCronJob ) {
        System.out.println( "executing on email cron job" ) ;
public abstract class AbstractCronJob {
    protected int _id ;
    protected PropertyList _propertyList ;
    public AbstractCronJob( int id ) {
        super();
        _id = id ;
        _propertyList = new PropertyList() ;
    protected void createProperties() {
        //fill in with factory crap
        _propertyList.add( new SubjectLineProperty() ) ;
    protected abstract void executeProperties();
    protected abstract void run() ;
    public void execute() {
        createProperties() ;
        executeProperties() ;
        run() ;
public class EmailCronJob extends AbstractCronJob {
    public EmailCronJob( int id ) {
        super( id ) ;
    /* (non-Javadoc)
     * @see com.reged.cron.AbstractCronJob#run()
    protected void run() {
        //send email
    protected void executeProperties() {
        //we had this as abstract...unless I'm missing something, we can do this
        //in this class instead of pushing it down
        Iterator iter = _propertyList.iterator() ;
        while ( iter.hasNext() ) {
            //safe cast
            BaseProperty baseProperty = ( BaseProperty ) iter.next() ;
            baseProperty.execute( this ) ;
}Okay, here is the problem that I am running into. The EmailCronJob knows that it has a list of properties, it doesn't know what type of properties it as. So when it iterates through its property list it upcasts then to the BaseProperty parent class. Then it calls the execute method on each property passing in itself.
I thought that the execute(EmailCronJob job) method in SubjectLineProperty would be executed since the overloaded method with the mailCronJob parameter lives in that class, instead I am finding that the execute(AbstractCronJob job) method in the BaseProperty class is eing exercised.
I am confused on why this doesn't work. Does polymorphism work with overloaded methods or just overridden methods?
Thanks!

We can think about it based on suppositions, satisfactory explanations, and based on OO design.
According to the experience from the code above, we can suppose that, at runtime, the virtual machine looks for an exact identical signature of an method to perform the overriding.
But, why does it work in that way? Is there any good justification, or is it just a implementation decision?
I think there is a good justification.
Let me get the Object.equals() method as an example, and let�s make an analogy with the code above. According to our conclusions from the experience above, that we suppose are right and should work, but actually they should not work, in order to use the equals() method, we can simply do this:
class TheClass {
private int whatever;
public TheClass(int param) {
    whatever = param;
//notice that the param is not Object
public boolean equals(TheClass param) {
    //we don�t need either to cast to TheClass or
    //verify if the param is an instance of TheClass
    if (this == param) return false;
    if (this.whatever == param.whatever) return true;
    else return false;
}Apparently, this equals() method above is more efficient, and it does make sense, too, and it would be considered a good and logic implementation of equals() method. Although, these conclusions are wrong, if you consider some OO concepts that are being broken here.
equals() method is defined in Object class as an contract, like an interface. It says that this method must receive an Object param. And according to this contract, two instances of Object can use this method. You have to obey this contract, because it is Oriented Object Programming.
If you use equals method without passing Object as an parameter, but passing other different class (like TheClass, in my example), you would not obey the contract, that says that two instances of Object can use this method. Try to do this:
public static void main(String[] args) {
    TheClass theClass1 = new TheClass(1);
    TheClass theClass2 = new TheClass(1);
    //Good, more or less, because our objective, that is,
    //calling the customized equals(), will be performed.
    System.out.println(theClass1.equals(theClass2));
    String str = "blah";
    //oops! The customized equals() method will not
    //be called this time
    System.out.println(theClass1.equals(str));
    Object obj1 = theClass1;
    Object obj2 = theClass2;
    //Again, the customized equals() method will not
    //be called this time. Thanks God it works in this way!
    //Because if the customized equals() method
    //could be called here, the "OO law"
    //and the "contract" of equals method
    //defined in Object class would be broken
    System.out.println(obj1.equals(obj2));
}Therefore, I think Java working in this way is good, because it obligates us to "obey the laws", in certain way.

My payment method is 'not valid in this store' when I've been using it for nearly a year now? I'm in the uk.

Today I was asked to sign in and check billin info when I tried to purchase an app, I entered my security code and it's now saying my payment method is not valid in this store! I've used the same payment method for about a year and have always used the uk store so I'm rather confused. All help is appreciated!

I don't know if this will work but go through the same procedure in the app store. You can access your ID at the bottom of the screen in the left hand corner of the featured tab. See if the correct region shows in there as well.
You can also check in the iTune app as well. You are using the correct Apple ID aren't you?
I have read that the iTunes stores can be very fussy about correct spelling of Street vs St., No. vs # - things like that. The billing address must match exactly the way that your credit card statement reads.
You can try signing out of your account in Settings>Store>Apple ID - tap sign out. Restart the iPad and then sign in again. See if that resets this whole mess for you.
Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.

Adobe Offline Form - Parse method is not possible for this type

Hi All,
I have developed an application for the offline scenario of interactive adobe form. I tried to load the adobe form from my desktop. After pressing the button "Display form" it throws an error "Parse method is not possible for this type".
If I include wdContext.getNodeInfo().getAttribute("pdfObject").getModifiableSimpleType() in the doInit() method of the view I receive this error -
com.sap.tc.webdynpro.progmodel.context.ContextException: MappedAttributeInfo(UploadView.pdfObject): must not modify the datatype of a mapped attribute
When I comment it out and upload I receive the error enclosed -
Parse method is not possible for this type
Can someone please help me with a step by step solution to this problem?
Any help is highly appreciated.
Many thanks,
Divya

Hi Divya,
Please try to do it as stated below:
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     ISimpleTypeModifiable type = attInfo.getModifiableSimpleType();
     IWDModifiableBinaryType binaryType = (IWDModifiableBinaryType)type;
Try putting the code in wdInit() or wdDoModifyView().
Let me know if you still face the issue.
Regards,
Arafat

Parse method is not possible for this type

I have a file upload component and one button in a view.
I have created a binary type context element and mapped it with fileupload component.while clicking the submit button I am getting " Parse method is not possible for this type" exception.
help me out.
Thanks In advance

Hi,
Thanks for your response. I have written the following code in wddoinit():
IWDAttributeInfo attributeinfo = wdContext.getNodeInfo().getAttribute(IPrivateSubstanceDocView.IFileUpload02Element.DATA);
attributeinfo.getModifiableSimpleType();
fileUpload02 is my context.
but I am getting a null pointer exception over here.
can ypu please help it.
Actually the case is this is a window, which is opening on click of a hyperlink on another View.
With the action method I am calling this View.
Thus on click of a hyperlink just I am opening a new View then here I am a browse button etc...
PLease help if you can

Parse method is not possible for this type Exception in web dynpro

I have a file upload component and one button in a view.
I have created a binary type context element and mapped it with fileupload component.while clicking the submit button I am getting " Parse method is not possible for this type" exception.
help me out.

Hi sridhar,
Use this code for Upload
context u create one attribute(up),u assign the data type as "Resource"(which is dictionary type)
InputStream text = null;
    int temp = 0;
    try
         File file = new File(wdContext.currentContextElement().getUp().getResourceName());
         FileOutputStream op = new FileOutputStream(file);
         if(wdContext.currentContextElement().getUp()!=null)
              text = wdContext.currentContextElement().getUp().read(false);
               while((temp=text.read())!=-1)
                                                                   op.write(temp);
         op.flush();
         op.close();
    catch(Exception e)
     e.printStackTrace();

Web Deploy error - "This method is not supported by this class"

I have an MVC project which I am trying to deploy to one of our internally-hosted web front end servers via a TFS build process. Our server hosts the MS Deploy service, and other solutions deploy without problems to the same box. The parameters for the build
process are as follows:
/p:DeployOnBuild=True /p:DeployTarget=MsDeployPublish /p:MSDeployPublishMethod=WMSVC /p:MsDeployServiceUrl=https://<server>:8172/msdeploy.axd /p:DeployIISAppPath="<internal.site.com>" /p:username=<username> /p:password=<password>
/p:IncludeIisSettingsOnPublish=false /p:AllowUntrustedCertificate=True /p:OutputPath=bin\ /p:SkipExtraFilesOnServer=True /p:VisualStudioVersion=11.0
The error message I receive at the point the build reaches the deployment activity is:
Web deployment task failed. (Could not complete the request to remote agent URL 'https://<server>:8172/msdeploy.axd?site=<internal.site.com>'.)
Could not complete the request to remote agent URL 'https://<server>:8172/msdeploy.axd?site=<internal.site.com>'.
The request was aborted: The request was canceled.
This method is not supported by this class.
We've found
this StackOverflow post which describes the same error we're experiencing, however the suggested solution is something we already do in our server configuration, so this doesn't resolve the issue for us.
Has anyone seen this error before, or is able to make any suggestions why it is happening?

Hi Matt,
You have to have a look in the build log then copy the command that is under Run MSBuild node and executed it on the build agent.
You should find something like below:
C:\Program Files (x86)\MSBuild\12.0\bin\amd64\MSBuild.exe /nologo /noconsolelogger "C:\Builds\....sln" /nr:False /fl /flp:"logfile=C:\Builds\...log;encoding=Unicode;verbosity=normal" /p:SkipInvalidConfigurations=true /p:CreatePackageOnPublish=true /p:DeployOnBuild=true /p:SkipExtraFilesOnServer=True /m /p:OutDir="C:\Builds\...\bin\\" /p:Configuration="DEV" /p:Platform="Any CPU" /p:VCBuildOverride="C:\Builds\....sln.Any CPU.DEV.vsprops" /dl:WorkflowCentralLogger,"C:\Program Files\Microsoft Team Foundation Server 12.0\Tools\Microsoft.TeamFoundation.Build.Server.Logger.dll";"Verbosity=Normal;BuildUri=vstfs:///Build/Build/31630;IgnoreDuplicateProjects=False;InformationNodeId=14;TargetsNotLogged=GetNativeManifest,GetCopyToOutputDirectoryItems,GetTargetPath;LogProjectNodes=True;LogWarnings=True;TFSUrl=http://...-tfs:8080/tfs/...;"*WorkflowForwardingLogger,"C:\Program Files\Microsoft Team Foundation Server 12.0\Tools\Microsoft.TeamFoundation.Build.Server.Logger.dll";"Verbosity=Normal;" /p:BuildId="aa2d3857-27e9-4854-b44f-4ca625ccd786,vstfs:///Build/Build/31630" /p:BuildLabel="..._2015.02.27.2" /p:BuildTimestamp="Fri, 27 Feb 2015 11:16:41 GMT" /p:BuildDefinition="..."
Daniel

I've a problem with my account , mainly in the payment method " security code is invalid" this the current situation wgat can i do ???

I've a problem with my account , mainly in the payment method " security code is invalid" this the current situation what can i do ???

you need to update your payment information to insert the correct security code.
http://support.apple.com/kb/ht1918

Use web service with overloaded method

Hi all,
Does anyone knows how can I use (e.g in VC or GP) a web service with overloaded methods?
When I try to use one, I get the following error message:
com.sap.engine.services.webservices.jaxrpc.exceptions.ProxyGeneratorException: Proxy Generator Error. WSDL Operation with name [search] is overloaded (defined twice). Operation overloading is not supported by proxy generator.
Can I set something in order to be able to use such type of services. Or some other solution?
For some reasons I do not want to change the service operation names.
Thanks in advance!
Best regards,
v s

Hi all,
Does anyone knows how can I use (e.g in VC or GP) a web service with overloaded methods?
When I try to use one, I get the following error message:
com.sap.engine.services.webservices.jaxrpc.exceptions.ProxyGeneratorException: Proxy Generator Error. WSDL Operation with name [search] is overloaded (defined twice). Operation overloading is not supported by proxy generator.
Can I set something in order to be able to use such type of services. Or some other solution?
For some reasons I do not want to change the service operation names.
Thanks in advance!
Best regards,
v s

Overloaded methods-yes or no & is this a good practice

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