Varying Number of Method Parameters

I read somewhere (pre 1.5 release) about allowing for the creation of methods with a varying number of parameters. Like what you'd use if you wanted to create a C style printf.
Did this make it into 1.5? If so what is the syntax?

it's in 1.5
void myMethod(String title, Object...args) {
// you can now deal with 'args' as if it were an array
}it was put in to allow for printf. well, printf was the final bit of leverage. AFAIK printf is much like in 'C'. it's a method on (I think) PrintWriter

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Problem in compilation with very large number of method parameters

I have java file which I created using WSDL2Java. Since the actual WSDL has a complex type with a large number of elements(around 600) in it, Consequently the resulting java file(from WSDL2Java) has a method that takes 600 parameters of various types. When I try to compile it using javac at command prompt, it says "Too many parameters" and doesn't compile. The same is compiling successfully using JBuilder X . The only way I could compile successfully at command prompt is by reducing the number of parameters to around 250 but unfortunately that it's not a workable solution. Does Sun specify any upper bound on number of parameters that can be passed to a method?

... a method that takes 600 parameters ...Not compatible with the spec, see Method Descriptors.
When I try to compile it using javac at
command prompt, it says "Too many parameters" and
doesn't compile.As it should.
The same is compiling successfully using JBuilder X .If JBuilder produces a class file, that class file may very well be invalid.
The only way I could compile
successfully at command prompt is by reducing the
number of parameters to around 250Which is what the spec says.
but unfortunately that it's not a workable solution.Pass an array of objects - an array is just one object.
Does Sun specify
any upper bound on number of parameters that can be
passed to a method?Yes.

Can we create JTable with multiple rows with varying number of columns ?

Hi All,
I came across a very typical problem related to JTable. My requirement is that cells should be added dynamically to the JTable. I create a JTable with initial size of 1,7 (row, columns) size. Once the 7 columns are filled with data, a new row should be created. But the requirement is, the new row i.e. second row should have only one cell in it initially. The number of cells should increase dynamically as the data is entered. The table is automatically taking the size of its previous row when new row is added. I tried by using setColumnCount() to change the number of columns to '1' for the second row but the same is getting applied to the first row also.
So can you please help me out in this regard ? Is it possible to create a JTable of uneven size i.e. multiple rows with varying number of columns in each row ?
Thanks in Advance.

Well a JTable is always going to paint the same number of columns for each row. Anything is possible if you want to rewrite the JTable UI to do this, but I wouldn't recommend it. (I certainly don't know how to do it).
A simpler solution might be to override the isCellEditable(...) method of JTable and prevent editing of column 2 until data in column 1 has been entered etc., etc. You may also want to provide a custom renderer that renderers the empty column differently, maybe with a grey color instead of a white color.

How to create a table with varied number of columns?

I am trying to create a balance table. The colunms should include years between the start year and end year the user will input at run time. The rows will be the customers with outstanding balance in those years.
If the user input years 2000 and 2002, the table should have columns 2000, 2001, 2002. But if the user input 2000 and 2001, the table will only have columns 2000 and 2001.
Can I do it? How? Thanka a lot.

Why did you create a new thread for this?
How to create a table with varied number of columns?

Why is there a limitation on the number of boolean parameters in a custom function?

We have a custom function which 'flattens' four text temporal values into a single temporal value.
We want to do the same with boolean temporal values.
However, OPM throws an error when it reads the metadata for the function in extensions.xml. It says all boolean paramaters need to be last. We can't put them all last as there are more than one.
This is OPM error code OPM-W00001.
Any ideas on how I can work around this limitation?

Taken from OPA Developer's help:
Only one boolean parameter can be passed to a function, and it must be the last parameter. This is due to a limitation in the rule compiler. Any number of other parameters may be present however.
Should you want to pass more boolean values, create a temporary/document text variable with values "True"/"False" using rule table.

Table with varying number of columns

Hello experts,
my issue:
I need to print a table with varying number of columns. Depending on if all cells of a certain column are initial the
whole column should disappear. Hiding is not enough.
If this columns is in the middle of the table the following columns should move left to fill the gap.
my approach: (maybe there is an easier one)
There are 4 different possible situations. My approach was to create 4 different tables with different amount of
columns. In the interface I fill the table that is really needed from the source table data and fill a flag that characteristics
the situation, possible values (1,2,3,4).
In the form I'd like to print the appropriate table depending on the situations.
my problem:
How to place all 4 possible tables lying upon each other in the form and print only the needed one depending on the flag value?
my question:
Is my approach ok? Or is there an easier one?
If it is ok. How can I solve the problem regarding printing the right table.
Thanks in advance!
Heinz

Hi Heinz,
You can handle it with FormCalc Script at initialization.
Suppose you have a table with name TABLE having a header HEADER and data row DATA:
TABLE-->HEADER(Cell1...Cell2...Cell3...Cell4)
--->DATA(Cell1...Cell2...Cell3...Cell4)
Suppose you want to hide Cell3 for null values, then write below code at initialization of DATA:
if(DATA[*].Cell3.rawValue eq null)
then
DATA[*].Cell3.presence = "hidden"
HEADER.Cell3.presence = "hidden"
else
DATA[*].Cell3.presence = "visible"
HEADER.Cell3.presence = "visible"
endif
Hope it would help.
Regards,
Vaibhav

Automatic output of method parameters

Hi,
Sometimes I find myself System.out'ing all parameters of a method. Is there a one-step way to do this? A one-liner that will output all method parameters (using reflection I guess) of the method the code is running in.
for e.g
public Car makeCar(Color carColor, int noOfWheels){
System.out.println(outputAllParametersOfThisMethod();
}Console:
carColor=Blue
noOfWheels=4
Appreciate any help that I can get!

Hi,
You can map these all parameters in Process instruction sheets and operator can view the PI sheet to view the process or qc parameter.
Find below the link
[http://help.sap.com/saphelp_47x200/helpdata/en/05/603bc6462311d182b50000e829fbfe/frameset.htm]
http://help.sap.com/saphelp_47x200/helpdata/en/05/603bc6462311d182b50000e829fbfe/frameset.htm
Sanjay

Dynamically create varying number of buttons

Hi.
The website I'm currently working on has an object gallery.
Whenever the user clicks one of the objects, it zooms in and
displays a sub-gallery with other images of said object. The images
that make up these galleries are loaded into dynamically created
empty MovieClips inside a sub-gallery MovieClip. Each object has a
varying number of images and they're loaded and unloaded when the
zooming in/out of the object ends.
When you click one of the sub-gallery images, the main image
should change and display the clicked image. However, I'm having
trouble telling the MovieClips containing the sub-gallery images to
do anything when they're clicked. See attached code, please.
I'm guessing this has to do with the onRelease being declared
inside the onMotionFinished. The thing is I can't thing of a way to
declare the onRelease for every sub-gallery image before they're
loaded.
Thanks in advance.

Frank,
Thank you for the response.
On the page2 of the pdf link you provided there is a picture of the tree table and it shows the hierarchy of the first level(or root) parent (President, Steven King). If the data had n presidents (n first or root level ) then this will dispaly all data in the same tree table like
King
--Kochhar
----Greenberge
King 2
--report 1
----report 1.1
King n
--report n
----report n.1
My requirement is pretty close to this but slighly different where these n first level should appear in n different tree tables like below:
Treetable for: King
King
--Kochhar
----Greenberge
Treetable for: King 2
King 2
--report 1
----report 1.1
Treetable for: King n
King n
--report n
----report n.1
That is the reason why I am playing with af:forEach and also have a separate VO which returns all the presidents(first level parents) and view linked that to EmployeesVO so that the AM looks like
AllPresidentsVO
-----EmployeesVO (with the view criteria wihch returns the first level parents)
---------reportingManagers
forEach prints n instances for PresidentsVO King, King2.. King n but all these instances have the same children the tree for King (tree for King2 ... King n does not appear)
May be it should be achieved in a different way?

Netbeans 6.0 - code completion of method parameters

I just updated to NetBeans 6.0 and I find the code completion of method parameters very annoying and counter productive.
It inserts the parameters as keywords when choosing a method from the list after pressing CTRL+SPACE.
How can I switch this off?
I searched the options and also the forum but didn't find a solution.

I know that pressing space or whatever replaces the selected parameter. For a method with a single parameter is not a big problem but this is a poor workaround if a method has more parameters, like eg
public static String formatDate(Date myDate, String myFormat)
When typing
Str.form<CTRL+SPACE,choose method, ENTER>
it looks like
Str.formatDate(myDate, errorMessage)
Although myDate is selected and I can overwrite it, I have to proceed to the next parameter with CTRL+M instead of simply typing a comma. This is very annoying if a method has more parameters and as this annoyance occurs approx. every 5 lines that accumulates.

Get method parameters at runtime?

Hey guys,
is there a way to get the parameters of a methods parameters at runtime? I have a reference to an object and would like to know which paranmeter does a method have.?
thx

Hello
You can use class CL_OO_CLASS (instance attribute METHOD_PARAMETERS ).
Regards
Uwe

Java coding standard- Number of methods in a class

Can anybody please tell me that what is the standard range for number of methods in a class. I need to refcator a very old code which contains large number of methods (50 to 100) in each class. Please help.

I got a huge screen and uses a small font ;)I have a wiiiiide screen. :D What's the maximum number of statements in a line?
I think that a method starts to get long when it's
more than 20 lines.Yepp, but I usually don't count line wraps. I'm not going to create another method for something like
if (abc == null
&& xyz == 17
&& udsfh == false
try {
whatever();
} catch (StupidExceptionA e) {
} catch (StupidExceptionB e) {
} catch (StupidExceptionC e) {
} catch (StupidExceptionD e) {
}It's annoying, but it also looks stupid to have a method that does nothing else but calling another method and catching the exceptions. That clutters the entire class.

Access fo Method parameters to Anonymous Class ?

Can somebody please provide some more information on the statement below? I am also searching for some sample code implementations of it. It would help the cause better.
+"Methods of the object of the anonymous class need access to final local variables and method parameters belonging to the method in which the anonymous class is defined. "+
Thanks in Advance

We're concerned here with "local" classes, i.e. classes defined inside methods (not all anonymous classes are local, and not all local classes are anonymous).
The thing about local classes is that, unlike local variables etc., instances of a local class may survive the method returning. For example a local class might be a listener which gets added to a swing component, it could be a Runnable that get's launched as a thread.
Local classes get to access local variables and parameters of the method in which they are declared but the variables or parameters have to be declared final because, since the class needs to be able to access the value of the local variable even after the method exits, and the variable ceases to exist, what actually happens it that the value of the variable is copied into a special field of the anonymous class, and if the variable could be changed after the class was defined, the two copies would then disagree.

Method parameters

Hello
I'm usimg this code to get the local variables in case of a method entry:
            error = jvmti->GetLocalVariableTable(method, &entryCount, &localVariableEntry);
            if(error == JVMTI_ERROR_NONE) {
                jvmtiLocalVariableEntry* entry = localVariableEntry;
                for(int i = 0; i < entryCount; i++, entry++) {
                    cout << entry->signature << ":" << entry->name << endl;
                    jvmti->Deallocate(reinterpret_cast<unsigned char*>(entry->signature));
                    jvmti->Deallocate(reinterpret_cast<unsigned char*>(entry->name));
                    jvmti->Deallocate(reinterpret_cast<unsigned char*>(entry->generic_signature));
                } // for
                jvmti->Deallocate(reinterpret_cast<unsigned char*>(localVariableEntry));
            } else if(error = JVMTI_ERROR_ABSENT_INFORMATION) {
                cout << "<NO LOCAL VARIABLE INFORMATION AVAILABLE>" << endl;
            } else {
                cout << "<ERROR>" << endl;
            } // if...else if...elseNow I'm wondering how to find the method parameters in all this local variables...
Is there a way to get obly the method parameters?
Thank you very much and with kind regards
Alexander Schell
Edited by: EJP on 3/10/2011 20:24: added {noformat}{noformat} tags: please use them.
Edit: Moved the first code-tag
Edited by: user3948319 on 03.10.2011 08:02

Hello and thanks for the answer...
That was my first assumption...but after running the code I got some puzzling results...here's an example:
callbackMethodEntry: methodName=reverse methodSignature=(Ljava/util/List;)V methodGenerigPtr=(Ljava/util/List<*>;)V classSignature=Ljava/util/Collections; thread=DestroyJavaVM
I:i
I:mid
I:j
Ljava/lang/Object;:tmp
I:i
I:mid
Ljava/util/ListIterator;:fwd
Ljava/util/ListIterator;:rev
Ljava/util/List;:list
I:size
The method entered takes surely one argument - a list...but the list is not the first entry in the array which is created by calling getLocalVariableTable...so I'm a wee bit confused right now...
I also don't understand under which circumstances the JVMTI_ERROR_ABSENT_INFORMATION error is raised...
before I forget: Thanks for the tip with the code tags...I looked for something to mark the code but could not find it...
With kind regards
Alexander Schell

How to get names of method parameters ?

How to get names of method parameters (Not only their type and value) is it only possible during debugging ??
for example void myFunction(int a,int b)
I need the "a" , and the "b" The issiue is about the java.lang.reflect.InvocationHandler ,
and its method invoke(Object proxy,
Method method,
Object[] args)
throws Throwable
I Have the parameter objects themself and their types using method.getParameters() , this is fine ,, but i need the names of the parameters !!!

If the class file was compiled without debug information included then it is impossible to get the original parameter names, as used in the source code.
However, If the class file does include debug information, then the method names are hidden deep within the class file. You'd need to parse the class file yourself. Check out a copy of the Java VM Specification for a detailed format of the java class file format.
It's not a trivial task to parse the java class file, and the VM spec isn't easy reading. You'd nearly be writing a class file disassembler.

Can WLW display the real names of method parameters, not arg0, arg1...

Hello
I am new to Java development and as I used to work with MS.NET usually rely on parameter names, so that I don't have to read documentations each time I use a method. However I noticed that WLW replaces the names of method parameters with arg0, arg1, arg2 etc. Is there a way to somehow make WLW display the real argument names and not those argX strings?
Thanks in advance.
Best regards,
Vasil Svetoslavov

In wlw select...
Tools
+-- IDE Properties
--Editor
Ensure that the following are Checked
Use Method Completion
Use Parameter Completion

Varying Number of Method Parameters

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