Creating dynamic object instance names

If I have a class such as ...
class NewDevice
I would create a new instance of that object by calling 'NewDevice' as ....
NewDevice nd = new NewDevice();
Suppose I don't actually know how many device I need before I read a file in and then subsequently create a new object instance. I could have a long list of variable name i.e. nd1, nd2, nd3 etc but that would be messy and I would be sure to run out.
My Question..........
How do I create object instances with unique names 'on-the-fly' so to speak
Thanks

Here's an example that allows you to build up a list of NewDevice instances, see how many there are and get them back by their index in the list:
public class MyClass
List newDeviceList;
public MyClass()
    newDeviceList = new ArrayList();
public void addNewDevice(NewDevice newDevice)
    newDeviceList.add(newDevice);
public int getNewDeviceCount()
    return newDeviceList.size();
public NewDevice getNewDevice(int idx)
    return (NewDevice)newDeviceList.get(idx);
}Hope this helps.

Similar Messages

Salmple at How to Create Dynamical Object for RTTC

Hi all, I need a sample at How to Create Dynamical Object for RTTC.
you can help me?.

Hello Martinez,
I have attached a sample for structure types. With the Where-Used-List on the Create() Method of the various RTTC classes one may find more samples. If you meant with object on OO Type then it is to mention that this is not possible yet.
Regards
Klaus
PROGRAM sample.
DATA: sdescr1 TYPE REF TO cl_abap_structdescr,
      sdescr2 TYPE REF TO cl_abap_structdescr,
      tdescr1 TYPE REF TO cl_abap_tabledescr,
      tdescr2 TYPE REF TO cl_abap_tabledescr,
      tref1   TYPE REF TO data,
      tref2   TYPE REF TO data,
      comp    TYPE abap_component_tab,
      wa      TYPE t100,
      xbuf    TYPE xstring.
FIELD-SYMBOLS: <tab1> TYPE table,
               <tab2> TYPE table.
sdescr1 ?= cl_abap_typedescr=>describe_by_name( 'T100' ).
comp     = sdescr1->get_components( ).
sdescr2 = cl_abap_structdescr=>create( comp ).
tdescr1 = cl_abap_tabledescr=>create( sdescr2 ).
tdescr2 = cl_abap_tabledescr=>create( sdescr2 ).
CREATE DATA: tref1 TYPE HANDLE tdescr1,
             tref2 TYPE HANDLE tdescr2.
ASSIGN: tref1->* TO <tab1>,
        tref2->* TO <tab2>.
wa-sprsl = 'E'. wa-arbgb = 'SY'. wa-msgnr = '123'. wa-text = 'first text'.   INSERT wa INTO TABLE <tab1>.
wa-sprsl = 'D'. wa-arbgb = 'SY'. wa-msgnr = '456'. wa-text = 'second text'. INSERT wa INTO TABLE <tab1>.
wa-sprsl = 'D'. wa-arbgb = 'XY'. wa-msgnr = '001'. wa-text = 'third text'.   INSERT wa INTO TABLE <tab1>.
wa-sprsl = 'D'. wa-arbgb = 'ZZ'. wa-msgnr = '123'. wa-text = 'fourth text'. INSERT wa INTO TABLE <tab1>.
wa-sprsl = 'E'. wa-arbgb = 'SY'. wa-msgnr = '123'. wa-text = 'ABAP is a miracle'. INSERT wa INTO TABLE <tab1>.
EXPORT tab = <tab1> TO DATA BUFFER xbuf.
IMPORT tab = <tab2> FROM DATA BUFFER xbuf.
LOOP AT <tab2> INTO wa.
WRITE: / wa-sprsl, wa-arbgb, wa-msgnr, wa-text.
ENDLOOP.

Error #1056, creating dynamic object

Hi,
I am simultaneously creating an object and adding it to an array, perhaps ill-advisedly. The following code worked on the main timeline, but not when I moved it to the constructor of a document class:
package {
     import flash.geom.Point;
    import flash.display.MovieClip;
    public class IconTour extends MovieClip {
        var thePoint:Point = new Point();
        var defaultColor:Number;
        var overColor:Number;
        var iconCreationList:Array = new Array();
        //var xx:MyIcon;
        public function IconTour(){
            thePoint.x=50;
            thePoint.y=300;
            defaultColor=0x7dc2df;
            overColor=0x788dec;
            iconCreationList.push(this["xx"+iconCreationList.length] = new MyIcon(thePoint,"folder","Text for the folder", "Folder", defaultColor, overColor));
            for each (var iconObject:MyIcon in iconCreationList) {
                addChild(iconObject);
The following error is generated:
>ReferenceError: Error #1056: Cannot create property xx0 on IconTour.
    at IconTour()
I guess this is because xx0 isn't declared? How does one declare a dynamic object/variable?

Nope. No mention. However, I guess I don't need to dynamically create a variable as this works:
iconCreationList.push(xx = new MyIcon(thePoint,"folder","Text for the folder", "Folder", defaultColor, overColor));
iconCreationList.push(xx = new MyIcon(thePoint,"assignments","Text for the assignment", "Assignments", defaultColor, overColor));
where this does not:
iconCreationList.push(this["xx"+iconCreationList.length] = new MyIcon(thePoint,"quiz","Text for the quiz", "Quiz", defaultColor, overColor));
iconCreationList.push(this["xx"+iconCreationList.length] = new MyIcon(thePoint,"assignments","Text for the assignment", "Assignments", defaultColor, overColor));
AS doesn't care if I add more than one object to the array that is named xx. I probably won't be referencing xx by that name anyway, just by iconCreationList[1].

Creating dynamical flat file name in mapping?

Hi.
I know about the variations on how to use an input parameter and/or sysdate to create a dynamic output file name in a mapping.
My challenge is nearly the same, but I cannot make OWB generate the correct code.
Problem:
- got a one column table that holds an identifier in a string field
- got a function that reads and returns said identifier
- imported function into OWB
- trying to use the function call in the Flat File Operator's Target Data File Name, e.g. fixedfilename||fn_get_id()||sysdate||'.ext
OWB creates the code:
UTL_FILE.FOPEN(
'my_location',
'fixedfilename'||fn_get_id()||'_'||SYSDATE||'.ext',
'w',
32767
However, when compiling the package code, it returns the warning:
ORA-06550: PACKAGE BODY, line 2214, column 29: PLS-00201: identifier 'FN_GET_ID' must be declared
which results in an error when trying to execute the mapping.
I've tried substituting the function call in the FOPEN call:
myId := fn_get_id();
UTL_FILE.FOPEN(
'my_location',
'fixedfilename'||myId||'_'||SYSDATE||'.ext',
'w',
32767
and this works fine, the mapping creates a file with the desired filename. But obviously not a good solution rewriting the generated code all the time....
Anyone solved something similar?
Could I use an input parameter and the autogenerated function GET_<PARAMETER>?
But can I set the value of an input parameter inside the very same mapping?
Regards,
-Haakon-

(It always helps writing out one's problems...)
I managed to get it working :-)
Added an input parameter to the mapping, and gave the outgroup variable a default value by calling my imported function.
Then concatenated the implicitly generated function (GET_PARAMETER) in the Target Data flat file name.
I now have a target file name that changes according to a departement id stored in a parameter table.
Regards,
-Haakon-

Create an object instance without calling its constructor?

Hi,
Sometimes it's useful to create object instances without calling their constructor. When? For example object deserialization.
By default when deserializating an object, the instance in the VM is created by calling the default constructor of the first non Serializable super-class (if you don't have such you're in trouble). I think that the db4o object database don't even call any constructor you may have written.
So such thing exists, but how is this possible? I fugured out that sun's deserialization mechanism first finds the constructor of the first non Serializable super-class and then:
cons = reflFactory.newConstructorForSerialization(cl, cons); Here I'm stuck.
Here's the source of the method for finding serializable constructor:
     * Returns subclass-accessible no-arg constructor of first non-serializable
     * superclass, or null if none found. Access checks are disabled on the
     * returned constructor (if any).
    private static Constructor getSerializableConstructor(Class cl) {
     Class initCl = cl;
     while (Serializable.class.isAssignableFrom(initCl)) {
         if ((initCl = initCl.getSuperclass()) == null) {
          return null;
     try {
         Constructor cons = initCl.getDeclaredConstructor(new Class[0]);
         int mods = cons.getModifiers();
         if ((mods & Modifier.PRIVATE) != 0 ||
          ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) == 0 &&
           !packageEquals(cl, initCl)))
          return null;
         cons = reflFactory.newConstructorForSerialization(cl, cons);
         cons.setAccessible(true);
         return cons;
     } catch (NoSuchMethodException ex) {
         return null;
    }So any info about this ReflectionFactory, and the problem as a whole?
Thanks.

So the question is how to create object instance without initializing it (calling the constructor)? And if you have any info about ReflectionFactory it will be useful too.
When serializing an object you save all its fields and some extra info. When you deserialize it you have to reconstruct it, by copying the fields back, but not to reinitialize.
import java.lang.reflect.*;
import java.io.Serializable;
import java.security.AccessController;
import sun.reflect.ReflectionFactory;
public class Test0 implements Serializable {
    public Test0() {
        System.out.println("Test0");
    public static void main(String[] args) throws Exception {
        Constructor<Test0> constr = reflectionFactory.newConstructorForSerialization(Test0.class, Object.class.getConstructor(new Class[0]));
        System.out.println(constr.newInstance(new Object[0]).getClass());
    private static final ReflectionFactory reflectionFactory = (ReflectionFactory)
     AccessController.doPrivileged(
         new ReflectionFactory.GetReflectionFactoryAction());
}When you execute this piece you get:
class Test0

Create SOFM object instance from PDF

Hi All,
I am using 4.6 version of SAP where FM 'sap_wapi_attachment_add' is does not exit. My query is to create an attachment (SMARTFORM coverted in PDF) in ABAP progam which i have to send as attachment with a Decision Task in the workflow.
I am able to send attachment with mail but to send attachment with decision task i need to create an instance of SOFM object. Please suggest an alternative method to do so instead of FM 'sap_wapi_attachment_add' .

Hi Taran,
I had put my code in workflow task. You can find the task method code below:
*Data declaration
DATA: GITAB     TYPE SOLIX_TAB,
      GSTAB     LIKE LINE OF GITAB,
      SOFM_KEY TYPE SOFMK,
      GIT_LINES TYPE SOLI_TAB.
DATA: LREF_DOCUMENT_BCS TYPE REF TO CL_DOCUMENT_BCS,
      LREF_IM_DOCUMENT   TYPE REF TO IF_DOCUMENT_BCS.
Generate Smartform*
CALL FUNCTION 'SSF_FUNCTION_MODULE_NAME'
    EXPORTING
      FORMNAME                 = C_FORM
*      VARIANT                  = ' '
*      DIRECT_CALL              = ' '
    IMPORTING
      FM_NAME                  = GV_FM
    EXCEPTIONS
      NO_FORM                  = 1
      NO_FUNCTION_MODULE       = 2
      OTHERS                   = 3.
IF SY-SUBRC <> 0.
*    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*       WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL FUNCTION 'SSF_GET_DEVICE_TYPE'
    EXPORTING
      I_LANGUAGE                   = SY-LANGU
*      I_APPLICATION                = 'SAPDEFAULT'
    IMPORTING
      E_DEVTYPE                    = GV_OUTPUT_OPTIONS-TDPRINTER
    EXCEPTIONS
      NO_LANGUAGE                  = 1
      LANGUAGE_NOT_INSTALLED       = 2
      NO_DEVTYPE_FOUND             = 3
      SYSTEM_ERROR                 = 4
      OTHERS                       = 5.
IF SY-SUBRC <> 0.
*    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*       WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
GV_OUTPUT_OPTIONS-TDNOPREV = 'X'.
GV_CONTROL_PARAMETERS-GETOTF = 'X'.
GV_CONTROL_PARAMETERS-NO_DIALOG = 'X'.
CALL FUNCTION GV_FM
    EXPORTING
*      ARCHIVE_INDEX              =
*      ARCHIVE_INDEX_TAB          =
*      ARCHIVE_PARAMETERS         =
      CONTROL_PARAMETERS         = GV_CONTROL_PARAMETERS
*      MAIL_APPL_OBJ              =
*      MAIL_RECIPIENT             =
*      MAIL_SENDER                =
      OUTPUT_OPTIONS             = GV_OUTPUT_OPTIONS
      USER_SETTINGS              = 'X'
      GV_ENAME                   = GV_ENAME
      GV_PERNR                   = GV_PERNR
      GV_PERSK                   = GV_PERSK
      GV_ZZ_LEVEL                = GV_ZZ_LEVEL
      GV_BTRTX                   = GV_BTRTX
      GV_GBDAT                   = GV_GBDAT
      GV_JOIN_DATE               = GV_JOIN_DATE
      GV_RESIN_DATE              = GV_RESIN_DATE
    IMPORTING
      DOCUMENT_OUTPUT_INFO       = GV_DOCUMENT_OUTPUT_INFO
      JOB_OUTPUT_INFO            = GV_JOB_OUTPUT_INFO
      JOB_OUTPUT_OPTIONS         = GV_JOB_OUTPUT_OPTIONS
    EXCEPTIONS
      FORMATTING_ERROR           = 1
      INTERNAL_ERROR             = 2
      SEND_ERROR                 = 3
      USER_CANCELED              = 4
      OTHERS                     = 5.
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL FUNCTION 'CONVERT_OTF_2_PDF'
*    EXPORTING
*      USE_OTF_MC_CMD               = 'X'
*      ARCHIVE_INDEX                =
    IMPORTING
      BIN_FILESIZE                 = GV_BIN_FILESIZE
    TABLES
      OTF                          = GV_JOB_OUTPUT_INFO-OTFDATA
      DOCTAB_ARCHIVE               = GIT_DOCS
      LINES                        = GIT_LINES_TEMP
    EXCEPTIONS
      ERR_CONV_NOT_POSSIBLE        = 1
      ERR_OTF_MC_NOENDMARKER       = 2
      OTHERS                       = 3.
IF SY-SUBRC <> 0.
*    MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*       WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL FUNCTION 'SX_TABLE_LINE_WIDTH_CHANGE'
    TABLES
      CONTENT_IN = GIT_LINES_TEMP
      CONTENT_OUT = GIT_LINES.
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*         WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
CALL FUNCTION 'SO_SOLITAB_TO_SOLIXTAB'
    EXPORTING
      IP_SOLITAB = GIT_LINES   "GIT_LINES_TEMP1
    IMPORTING
      EP_SOLIXTAB = GITAB.
*Create SOFM object from smartform PDF
IF NOT GITAB IS INITIAL.
      TRY.
          CALL METHOD CL_DOCUMENT_BCS=>CREATE_DOCUMENT
            EXPORTING
              I_TYPE          = 'BIN'
              I_SUBJECT       = 'NOTICE PAY WAIVER FORM'
*          I_LENGTH        =
*          I_LANGUAGE      = SPACE
*          I_IMPORTANCE    =
*          I_SENSITIVITY   =
*          I_TEXT          =
              I_HEX           = GITAB
*          I_HEADER        =
*          I_SENDER        =
            RECEIVING
              RESULT          = LREF_DOCUMENT_BCS.
        CATCH CX_DOCUMENT_BCS .
      ENDTRY.
LREF_IM_DOCUMENT = LREF_DOCUMENT_BCS.
TRY.
          CALL METHOD LREF_DOCUMENT_BCS->ADD_DOCUMENT_AS_ATTACHMENT
            EXPORTING
              IM_DOCUMENT = LREF_IM_DOCUMENT.
        CATCH CX_DOCUMENT_BCS .
      ENDTRY.
TRY.
          CALL METHOD LREF_DOCUMENT_BCS->GET_DOCTP
            RECEIVING
              RESULT = SOFM_KEY-DOCTP.
        CATCH CX_OS_OBJECT_NOT_FOUND .
      ENDTRY.
TRY.
          CALL METHOD LREF_DOCUMENT_BCS->GET_DOCYR
            RECEIVING
              RESULT = SOFM_KEY-DOCYR.
        CATCH CX_OS_OBJECT_NOT_FOUND .
      ENDTRY.
TRY.
          CALL METHOD LREF_DOCUMENT_BCS->GET_DOCNO
            RECEIVING
              RESULT = SOFM_KEY-DOCNO.
        CATCH CX_OS_OBJECT_NOT_FOUND .
      ENDTRY.
SWC_CREATE_OBJECT NOTICE_PAY_WAIVER_FORM 'SOFM' SOFM_KEY.
      SWC_SET_ELEMENT CONTAINER 'NOTICE_PAY_WAIVER_FORM'
                                 NOTICE_PAY_WAIVER_FORM.
    ENDIF.
The object instance thus created will be visible along with other object instances in the workitem display. Provide this object in binding of decision step as you provise any other obect instance and not as ATTACH_OBJECT
Regards,
Neha

How to create dynamically object in labview 6.0?

i can't create dynamically an object (or insert automatically a word in a ring box)

Hi,
to insert the word into the ring you have to create the ring property node on the block diagram. To do it just right click on the ring cotrol and select Creat->Property node from pop-up menu. The select property "Strings []" by right clicking on the property node in the block diagram.
This array corresponds to the strings in the ring control. So you can change it and read info from it.
Good luck
Oleg Chutko/
Attachments:
Add.vi ‏17 KB

How to get object/instance name in method

Hi folks,
I have created a class and implemented a method within the class.
Now i would like get the name of instance/object calling this method ,within this method.
Is their any way to get this obj name within method?
Eg:
I hve class ZCL with method METH
Now in some program i used this method, by creating any obj
          data obj type ref to ZCL
          obj->METH
Now is there any way to get this obj name within the methodMETH by using some method like GET_OBJ_NAME(just making a guess)
Regards
PG

>
PG wrote:
> Now is there any way to get this obj name within the methodMETH by using some method like GET_OBJ_NAME(just making a guess)
>
> Regards
> PG
Please check the below code snippet
DATA:
    lref_obj TYPE REF TO cl_abap_typedescr.
lref_obj ?= cl_abap_objectdescr=>describe_by_object_ref( me ).

Only knowing the object instance name at runtime

I trying to create objects at runtime but I wont know the var name of the object till runtime, im trying something like this -
name = console.readLine();
Account name = new Account(name);The problem is that name is a string so I can't call the instance of Account that, anyone have any ideas? I've been looking through the reflection tutorial but I havn't found anything.
Thanks.

Can you do something like what's in the following
thread:
http://forum.java.sun.com/thread.jspa?threadID=634815
String name = console.readLine();
Account anAccount = new Account(name);
Map myMap = new HashMap();
myMap.put(name, anAccount);
Account theAccount = (Account)myMap.get(name);
That looks like it should work, thanks for your help.

A way to create new object instances in a loop?

I have an square matrix of String values.
Is there a way to take each row, make it into an object, and put the object in a new square matrix of objects?
Any ideas?

Do you mean something like this:Integer[][] foo = new Integer[5][5];
for (int i = 0; i < foo.length; i++) {
for (int j = 0; j < foo.length; j++) {
foo[i][j] = new Integer(i + j);
}It's hard to guess what you want, why not post some code (use the code tags: Formatting tips)

How to create dynamic object in painter screen.

hi
one case need to display some object in screen,but these object just be determined when program is running.
some one can give me simple demo code
and how to find to detail information from sap douc!
thank you advance!

hi
thank you !
how much and what object (button,label,input,picture...)
just determin in parameter table and table content will change by user!

Is create possible to dynamic object?

I want to creating dynamic object.
For example.
class A{
public static void main(String[] args){
testObject("Test");
public static void testObject(String obj){
Class c = Class.forName(obj);
obj o = c.newInstance();
I define object type to use variable obj.
Is it possible?
obj o = c.newInstance();

Still don't understand your question. Maybe this will help:
public class TestNewInstance
     public static void main(String args[])
          throws Exception
          Object o = createNewInstance("java.lang.StringBuffer");
          StringBuffer sb = (StringBuffer)o;
          sb.append("I just created a StringBuffer");
          System.out.println(sb.toString());
     public static Object createNewInstance(String className)
          throws Exception
          return Class.forName(className).newInstance();
}Notice how the code looks better when you use the "Code" tags as explained above?

Fetching Dynamic Object issue

Hi all,
Instead of define an variable as external (due to size limitation), I decided to use session.getInstanceData to obtain the value in an instance variable. While things works well on my environment, it does not work out in the QA environment. The following is how I do it:
DynamicObject instanceData =
session.getInstanceData(instanceInfo.getId());
Map dataMap = instanceData.asMap();
//Get screening result
String resultStr = "";
boolean hasResult =
dataMap.containsKey("screeningResults");
if (hasResult){
Object resultValue =
dataMap.get("screeningResults");
resultStr = resultValue.toString();
I have also log the content of screen result inside the activity:
logMessage("leaving ... "+this.activity.name +" with screening results="+ this.screeningResults);
At my environment, I can see the content pass from the engine back to PAPI. However, on QA environment, I see the content show on the engine log (due to the logMessage) but PAPI gets empty string back.
At first I thought it is due to the "Max Instnace Size limitation", so I upped the limit to 2000kb, but it still doesn't solve the issue. So anyone got any idea what did I do wrong or forgot to handle? Thanks!
Matthew

Can I create dynamic object?Depends what you mean by "dynamic object." That term is not part of standard Java parlance, AFAIK.

Unique instance names in distributed environment

The 11.1.2.1 installation guide (http://download.oracle.com/docs/cd/E17236_01/epm.1112/epm_install_11121.pdf) says, on page 122 of the .pdf:
+"When you configure in a distributed environment, provide a new, unique instance name as you configure each server. For example, if you are using the default instance name epmsystem1 on the first server, and you keep the same naming convention on subsequent servers, you would create new, unique instance names on each subsequent server, such as epmsystem2, epmsystem3, and so on."+
No reason not to follow this advice, but wondering if it's really necessary. I feel sure I've seen installations where 'epmsystem1' was used on e.g. both a web application server and the Essbase server. Perhaps I'm remembering incorrectly.

Yes each server requires a unique name as it is registers the server with the shared services registry against the instance name, maybe it was on a 11.1.2.0 deployment that you saw the same instance name across the distributed environment.
Cheers
John
http://john-goodwin.blogspot.com/

Dynamic Object for Checkbox in HTMLB control

Hi all,
I want to create dynamic object for Checkbox in HTMLB control.
I have created dynamic check box in JSP using JSPDynpage. I can select multiple values in the list of checkbox.After clicking the submit button , I have to read the value of checkbox. For this first i want to create the object for checkbox in controller.
How can i create the dynamic object?
Help me in this regard.
Thanks & Regards
Hemalatha J

Krish
Will this link helps you ????
<a href="http://help.sap.com/saphelp_nw04/helpdata/en/7d/9b0e41a346ef6fe10000000a1550b0/frameset.htm">Check Box</a>
Thanks
Jack
Allot points if it helps

Creating dynamic object instance names

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