JTable with different number of columns (packets)

Hi experts,
is it possible to draw a single JTable which have different number of columns in each row
if yes good
if no my project is to build a comperhensive packet sniffer what is the most appropriate swing component to repersent a packets (data,Ack,...) which have different number of fields and when i select one packet it is highlighted with different color
Best Regards

AHDK wrote:
is it possible to draw a single JTable which have different number of columns in each rowThis is about how to make a cell span multiple cells: [http://www.codeguru.com/java/articles/139.shtml]
The code is a little buggy. I used it in a practical example, and removed the bugs:
[http://forum.byte-welt.net/attachment.php?attachmentid=132&d=1249675825] (source code is included in the jar file)

Similar Messages

LSMW uploading excel with different number of columns

Dear Expert,
I am trying to build a lsmw to upload data sometime the number of columns are different. For example, a standard excel has 5 columns but sometime it only has 4 columns with the input screen of 4 fields. I am wondering what is the APAB code I could put in may LSMW field mapping say if the value from the excel is "/" then this field should be skiped from reading. Then my LSWM will generate a batch input filed with 4 columns of input data to fit in the input screen with for fields only, If the value from the excel does not have "/' then all field would be read. So my LSMW will generate a batch input with 5 columns of input data to fit in the input screen of 5 fields.
If you may share the coding.
Thank you

Hi,
In this step, click on the target field and then click on the button "Rule"
IN the next screen select the radio button "ABAP Code"
Then put the code as below:-
IF NOT <Source Field> IS INITIAL.
<Target Field> = <Source Field>.
ENDIF.
(Insteac of <Source Field> and <Target Field>, put your actual value in your LSMW.)
Regards,
Gaurav

Alternate rows with different number of columns in JTable or similar

Hi Guys,
I have tried searching google and these forums, but have not been able to find what I am looking for.
Looking for ideas, on how to do the following
I have a swing application, that I would like to have alternate rows
eg.
1st row has 10 columns
2nd row has 1 column, that expands all 10 columns of the 1st row
and keeps alternating like this for the rest of the records in the table.
Is there a special JTable that can do this for me, or has anyone had to do this before.
Thanks,
Mac

an example of merging cells is here
[http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples4.html]
scroll down to 'Multi-Span Cell'
run the program, highlight some cells, click combine.
if that's the type of thing you're after, modify your code per what's in 'combine'
note: the original code (now) produces a stack overflow error (don't know if it's been fixed in the above link),
but if you get that error, in AttributiveCellTableModel's setDataVector( Vector newData, Vector columnNames )
change
setColumnIdentifiers(columnNames);
to
columnIdentifiers = columnNames;

How to load data from file contains rows with different number of columns

hi all,
a data file contains assets data ordered like this(location_id
serial_number , quantity
serial_number , quantity
single column rows represents location, and two columns rows represents asset details for that location
123
12345 ,1
32145 ,1
124
12348 ,12
41239 ,22
54189 ,2
254
22419 ,1
I want to use sql loader to load these data after merging locations with thieir assets,like this order(location_id,serial number,quantity)
123 ,12345 ,1
123 ,25413 ,1
123 ,32145 ,1
124 ,12348 ,12
124 ,41239 ,22
124 ,54189 ,2
254 ,22419 ,1
Can one help me in that?
thank you,

Create external table and code sql query to do it.
:p

Make Concatenation with different number of columns in Sequence

I have the folowing query
select dated,sum(substr(hrs,1,2)) ||':'|| sum(substr(hrs,4,5)) hrs,dpt,reason
from dpr.stp_00_00
group by dated,dpt,reason
order by dated
and the output of this query is this
DATED     HRS     DPT     REASON
10/14/2011     2:5     Mechanical     Boiler tubes damaged & less availability of steam due to only one boiler operation
10/14/2011     0:20     Mechanical     Breakage of link of bagasse carrier # 1 and surplus carrier
10/14/2011     1:0     Mechanical     Choke at belt conveyor
10/15/2011     0:10     Mechanical     Boiler pressure dropped
10/16/2011     1:30     Electrical     Power failure / 505 governor card damaged of turbine # 2
10/16/2011     0:10     Mechanical     3rd mill taken in line
10/16/2011     0:30     Mechanical     Raw juice line before primary heaters busted
10/16/2011     1:0     Mechanical     Raw juice pump at mill house NRV body got busted
I have grouped the rows with reason column but due to that the reason is different for each dept and also and for different in each date there fore i want to do that the reason in all dates should be concatenated in single rows in Reason column In other words all reasons in all dates should be shown in single column with grouped date and Department and after the output of data should be like bellow
DATED     HRS     DPT     REASON
10/14/2011     2:5     Mechanical     Boiler tubes damaged & less availability of steam due to only one boiler operation - Breakage of link of bagasse carrier # 1 and surplus -Mechanical     Breakage of link of bagasse carrier # 1 and surplus carriercarrier - Mechanical     Choke at belt conveyor

How about this:
WITH t AS
(SELECT TO_DATE('10/14/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Boiler tubes damaged and less availability of steam due to only one boiler operation' reason FROM dual UNION ALL
SELECT TO_DATE('10/14/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Breakage of link of bagasse carrier # 1 and surplus carrier' reason FROM dual UNION ALL
SELECT TO_DATE('10/14/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Choke at belt conveyor ' reason FROM dual UNION ALL
SELECT TO_DATE('10/15/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Boiler pressure dropped' reason FROM dual UNION ALL
SELECT TO_DATE('10/16/2011', 'MM-DD-YYYY') dated, 'Electrical' dpt, 'Power failure / 505 governor card damaged of turbine # 2 ' reason FROM dual UNION ALL
SELECT TO_DATE('10/16/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, '3rd mill taken in line' reason FROM dual UNION ALL
SELECT TO_DATE('10/16/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Raw juice line before primary heaters busted' reason FROM dual UNION ALL
SELECT TO_DATE('10/16/2011', 'MM-DD-YYYY') dated, 'Mechanical' dpt, 'Raw juice pump at mill house NRV body got busted' reason FROM dual)
SELECT   dated,
         dpt,
         RTRIM(XMLAGG(XMLELEMENT(c, reason||' - ')).extract ('//text()'), ' - ') reasons
FROM     t
GROUP BY dated,
         dpt

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.

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

Displaying tables with dynamic number of columns

Hello,
I'm pretty new to JSF. Currently I'm working on a project where I have to select a table from a list, and then make it browsable/editable. The problem I have is that the different tables also have a different number of columns.
I have no problem displaying different tables if the number of coulumns stays the same (using h:datatable) but when it's dynamic, I don't know how I can have my JSP to adjust to support the varying number of columns.
Has anyone got an example of dynamic datatable or maybe someone can point me in the right direction.
Brimborian

Hi daniel,
1. There is an INDEPENDENT FORM
whose inputs are FIELD LIST
and from those, it consructs dynamic table.
2. Here is the program.
the dynamic table name will be
<DYNTABLE>.
3. U can use this program (FORM in this program)
to generate any kind of internal table
by specifying some inputs (ie. field list)
4.
REPORT abc.
COMPULSORY
FIELD-SYMBOLS: <dyntable> TYPE ANY TABLE.
FIELD-SYMBOLS: <dynline> TYPE ANY.
DATA: lt TYPE lvc_t_fcat.
DATA: ls TYPE lvc_s_fcat.
FIELD-SYMBOLS: <fld> TYPE ANY.
DATA : fldname(50) TYPE c.
PARAMETERS : infty(4) TYPE c OBLIGATORY.
DATA : iname LIKE dd02l-tabname.
START-OF-SELECTION.
GET INFO
CONCATENATE 'P' infty INTO iname.
DATA : ddfields LIKE ddfield OCCURS 0 WITH HEADER LINE.
CALL FUNCTION 'DD_NAMETAB_TO_DDFIELDS'
EXPORTING
tabname = iname
TABLES
ddfields = ddfields.
CONSTRUCT FIELD LIST
LOOP AT ddfields.
ls-fieldname = ddfields-fieldname.
APPEND ls TO lt.
ENDLOOP.
PERFORM
PERFORM mydyntable USING lt.
BREAK-POINT.
INDEPENDENT FORM
FORM mydyntable USING lt TYPE lvc_t_fcat .
Create Dyn Table From FC
FIELD-SYMBOLS: <fs_data> TYPE REF TO data.
FIELD-SYMBOLS: <fs_1>.
FIELD-SYMBOLS: <fs_2> TYPE ANY TABLE.
DATA: lt_data TYPE REF TO data.
ASSIGN lt_data TO <fs_data>.
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = lt
IMPORTING
ep_table = <fs_data>
EXCEPTIONS
generate_subpool_dir_full = 1
OTHERS = 2.
IF sy-subrc <> 0.
ENDIF.
Assign Dyn Table To Field Sumbol
ASSIGN <fs_data>->* TO <fs_1>.
ASSIGN <fs_1> TO <fs_2>.
ASSIGN <fs_1> TO <dyntable>.
ENDFORM. "MYDYNTABLE
regards,
amit m.

DB view with flexible number of columns?

In my Oracle 10 I have these tables
Customer table:
id      customer
1       John
2       Bob
Item table
id      item_name
1       itemA
2       itemB
3       itemC
4       itemD
Purchase table:
id      item_id date    customer_id
1       3       070202 2
2       6       070203 5
...I'd like to create a view like this:
        itemA   itemB   itemC   itemD   ...
John    3       4       0       0       ...
Bob     0       3       0       0       ...
...The view showed John purchased itemA 3 times, item B 4 times. Bob purchased itemB 3 times. This assume each customer only by one item at a time, which is a reasonable simplification of my situation.
Such a view (with variable number of columns) is needed not in our web application but also provide an understandable data source for non IT professional to use report software. If my approach of solving this problem is completely wrong, I'd also like to know what's the common practice. Thank you very much in advance!
Message was edited by:
user609663

I have tried to ask the question in a way that greatly simplify current problem to make it easy for others to understand without having to explain a lot of background information and 'the situation'; it seems I over-simplified the issue to make it even not worth solving or a wrong question being asked. So here I explain the complete problem and look for advice again (be prepared, pretty long description following:). I am a purchased customer of Oracle 10 DB and I reasonably expect being considered as Oracle user looking for help rather than students trying to play smart with assigned data normalization course exercises.
We are working on a system that collects data from interview results. The questionnaires for the interviews are formatted with a coded question, followed by user's answer to the question, like the following:
     Question Code   Question content   Answer
     H001            ...                123
     H002            ...                45
     H003            ...                33
     H004            ...                66
     H005            ...                4,66
     ...             ...                ...The users answer question with a digit, for some special questions, e.g. H005, they are allowed to answer with a set of digits. There are thousands of interviews each year, the simplest solution to collect the interview answers is to use such a db table:
simple_db_table:
id   H001 H002 H003 H004 H005 H006 H007
1    123   45    33    66    4     82    9
...This solution have two problems:
1. It doesn't properly store answers to questions that requre a set of digits, like H005.
2. The number of questions and their codes change from one survey to another, but the table have fixed number of columns and column names.
And two benefit:
1. With such simple table, people who use report software that directly access oracle db can creat their reports on easy-to-understand data presentation;
2. calculation based on questionnaire data is simple, e.g. get the average of H007/H009 for questionnaires that have H002 > H003 * 600 would be:
SELECT SUM(H007) / SUM(H009) FROM simple_db_table WHERE H002 > H003 * 600;Next solution we have normalized tables:
questionnaire_entry_table:
id                 NUMBER
questionnaire_name CHARquestionnaire_definition_table:
id                 NUMBER
questionnaire_id   NUMBER
question_code      CHAR
question_content   VARHCARinterview_table:
id                 NUMBER
questionnaire_id   NUMBER
date               DATEquestionnaire data table: itv_data
id                 NUMBER
interview_id       NUMBER
question_code      CHAR
answer             NUMBERWith the new structure, it just turn the problems of simple_db_table to its benefit and simple_db_table's benefit become the problem:
1. Personnel who use report creation software feel too confused to make report based on such tables, because they do not understand the normalized modeling. In our case, effective training is difficult because there will be many geographically distributed people make reports based on this structure and they have lower IT knowledge than database administrators. These personnel can make reports based on simple_db_table.
2. calculation based on questionnaire data is very difficult.
To explain 2, let's take the same example, we still wish to get the average of H007/H009 for questionnaires that have H002 > H003 * 600, my method is:
setp 1: create a view with by using:
       CREATE VIEW v (id, H002, H003) AS
       SELECT a.itv_id, a.H002, b.H003
         FROM itv_data a, itv_data b
       WHERE a.interviewee_id=b.interviewee_id
         AND a.question_code='H002' AND b.question_code='H003';step 2: create a stored procedure to get the calculation result:
       CREATE OR REPLACE PROCEDURE get_result (result OUT NUMBER) IS
         sh007 NUMBER := 0;
         sh009 NUMBER := 0;
       BEGIN
         SELECT SUM(H007) INTO sh007 FROM itv_data
           WHERE itv_id in (SELECT id FROM v WHERE H002 > H003 * 683);
         SELECT SUM(H009) INTO sh009 FROM itv_data
           WHERE itv_id in (SELECT id FROM v WHERE H002 > H003 * 683);
         idc := sh007/sh009;
       END get_idc;As you can see the calculation become much more complex and might involve overhead.
There might be better way to calculate the result that I don't know yet. We have some 100 different formulas to calculate different results, so it's important to get them right and efficiently.
The best solution seems to me is that to create such a view from itv_data and other tables so that to reflect the same structure of simple_db_table. So here comes the question I originally asked how is it possible to create a view with flexible number of columns. I made the very simple example in my original posted message wishing to get an idea of this is possible or the way to go.
I may be taking a completely wrong approach to attack the problem, e.g. perhaps there is a simpler way to get_result from itv_table and for report creation users I should use a metadata layer on top of the normalized table structure (e.g. by using Metadata Query Language from Pentaho BI). But anyway I'd like to get some insightful ideas from the forum. Again thanks for help in advance.

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?

How can i export the data to excel which has 2 tables with same number of columns & column names?

Hi everyone, again landed up with a problem.
After trying a lot to do it myself, finally decided to post here..
I have created a form in form builder 6i, in which on clicking a button the data gets exported to excel sheet.
It is working fine with a single table. The problem now is that i am unable to do the same with 2 tables.
Because both the tables have same number of columns & column names.
Below are 2 tables with column names:
Table-1 (MONTHLY_PART_1)
Table-2 (MONTHLY_PART_2)
SL_NO
SL_NO
COMP
COMP
DUE_DATE
DUE_DATE
U-1
U-1
U-2
U-2
U-4
U-4
U-20
U-20
U-25
U-25
Since both the tables have same column names, I'm getting the following error :
Error 402 at line 103, column 4
alias required in SELECT list of cursor to avoid duplicate column names.
So How can i export the data to excel which has 2 tables with same number of columns & column names?
Should i paste the code? Should i post this query in 'SQL and PL/SQL' Forum?
Help me with this please.
Thank You.

You'll have to *alias* your columns, not prefix it with the table names:
$[CHE_TEST@asterix1_impl] r
1 declare
2    cursor cData is
3      with data as (
4        select 1 id, 'test1' val1, 'a' val2 from dual
5        union all
6        select 1 id, '1test' val1, 'b' val2 from dual
7        union all
8        select 2 id, 'test2' val1, 'a' val2 from dual
9        union all
10        select 2 id, '2test' val1, 'b' val2 from dual
11      )
12      select a.id, b.id, a.val1, b.val1, a.val2, b.val2
13      from data a, data b
14      where a.id = b.id
15      and a.val2 = 'a'
16      and b.val2 = 'b';
17 begin
18    for rData in cData loop
19      null;
20    end loop;
21* end;
for rData in cData loop
ERROR at line 18:
ORA-06550: line 18, column 3:
PLS-00402: alias required in SELECT list of cursor to avoid duplicate column names
ORA-06550: line 18, column 3:
PL/SQL: Statement ignored
$[CHE_TEST@asterix1_impl] r
1 declare
2    cursor cData is
3      with data as (
4        select 1 id, 'test1' val1, 'a' val2 from dual
5        union all
6        select 1 id, '1test' val1, 'b' val2 from dual
7        union all
8        select 2 id, 'test2' val1, 'a' val2 from dual
9        union all
10        select 2 id, '2test' val1, 'b' val2 from dual
11      )
12      select a.id a_id, b.id b_id, a.val1 a_val1, b.val1 b_val1, a.val2 a_val2, b.val2 b_val2
13      from data a, data b
14      where a.id = b.id
15      and a.val2 = 'a'
16      and b.val2 = 'b';
17 begin
18    for rData in cData loop
19      null;
20    end loop;
21* end;
PL/SQL procedure successfully completed.
cheers

Report with indefinite number of columns

Hello,
I'm using VB.NET and Crystal Reports 2008 for my Windows application.
I've a new report to implement. It's a budgetting report in a table form, which shows the amount of money allocated to a certain projects over a range of years. In each row I show the different projects, in each column I show the budget of each project per year. Users can select the number of years to print (as a parameter), that means, the number of columns is dynamic.
My question is, how am I going to design this report? Will cross-tab help? My report will be in landscape format. The page width is enough for 8 columns, i.e. 8 years can be printed per table. If users choose to print more than 8 years, the "extra" columns should be printed on a new table underneath the one with the first 8 years, or on a new page if there's not enough space underneath.
Your help and suggestions would be much appreciated. Thank you very much.
Agnes

use conditional supressions on the fields in the colums so based upon parameter selection it will display what is shown
insert a section below the other and then use the conditional supression based upon the selection of 8+
cross tabs have limitations and are hard to read.

Report with undefined number of columns

Hello,
I'm using VB.NET and Crystal Reports 2008 for my Windows application.
I've a new report to implement. It's a budgetting report in a table form, which shows the amount of money allocated to a certain projects over a range of years. In each row I show the different projects, in each column I show the budget of each project per year. Users can select the number of years to print (as a parameter), that means, the number of columns is dynamic.
My question is, how am I going to design this report? Will cross-tab help? My report will be in landscape format. The page width is enough for 8 columns, i.e. 8 years can be printed per table. If users choose to print more than 8 years, the "extra" columns should be printed on a new table underneath the one with the first 8 years, or on a new page if there's not enough space underneath.
Your help and suggestions would be much appreciated. Thank you very much.
Agnes

Please note, this forum is dedicated to topics related to custom application development or deployment with Crystal Reports in .Net. This includes full versions of Crystal Reports as well as those versions of Crystal Reports bundled with Microsoft Visual Studio .Net.
As your query concerns design of an actual report, you should be posting your query to the Crystal Reports Design forum:
SAP Crystal Reports
Ludek
Moved to Report Design Forum
Edited by: Don Williams on Nov 24, 2008 7:23 AM

BI Layout/Template | Table with dynamic number of columns

hi!
i have a problem concerning the creation of a dynamic report with the BI publisher.
in my BI template i need a table with a dynamic number of columns. i have searched the
forums but havent really found a solution for this type of problem.
first of all this is A dummy-structure of my dataset:
<ROWSET>
     <ROW>
          <FIELD1>1</FIELD2>
          <FIELD2>2</FIELD2>
          <FIELD3>3</FIELD3>
          <FIELD4>4</FIELD4>
     </ROW>
     <ROW>
          <FIELD1>a</FIELD2>
          <FIELD2>b</FIELD2>
          <FIELD3>c</FIELD3>
          <FIELD4>d</FIELD4>
     </ROW>
</ROWSET>
in the report the fields represent the columns i need in the table.
the problem is, that the number of the fields vary. in this example i have 4 fields/columns
but another time i may have 6 or 10 etc..
my dataset is always different because i am loading my dataset via a http request which is
returning the needed data in XML.
is there a nativ possibility within the publisher to generate the columns dynamically?
i read about <?split-column-header:group element name?> etc. but this is only for cross-tables.
can anybody give me a hint how to approach this problem?
would be very glad for some advice.
thanks a lot in advance!

Specific answer is here
http://winrichman.blogspot.com/2008/09/dynamic-column.html
but these link let you know, how to do
http://winrichman.blogspot.com/search/label/Dynamic%20column
http://winrichman.blogspot.com/search/label/Cross-tab
http://winrichman.blogspot.com/search/label/cross%20tab

How create table with variable number of columns?

I am creating table data in Java. Number of columns is variable. How I can write <table> in UIX.
Here is code of one of my unsuccessful attempt:
<provider>
<!- get table data like DataObjectList-->
<data name="ReportTableData">
<method class="app.ReportTableData" method="getTableData"/>
</data>
<!- get names of columns like DataObjectList-->
<data name="ColumnNames">
<method class="app.ReportTableData" method="getColumnNames"/>
</data>
</provider>
<table data:tableData="@ReportTableData">
<contents data:childData="@ColumnNames">
<text data:text="nameColumn"/>
</contents>
</table>
I hoped that I can get cell data by key, where key is name of column. But cells of table contain only names of columns.
Please help me, where I mistaken?
Thank you.

Hi Sergey,
The UIX table implementation relies on a childData like mechanism internally to iterate over the rows. For instance, when you databind the text attribute of the UINode used to stamp out each column, you are relying on the uix:table iterating over the table data using the data object for the current row when evaluating your column stamp.
Setting the data:childData attribute on the table's contents element conflicts with UIX's internal iteration over the tableData. For this reason, we don't support specifying a dynamic number of table columns in UIX XML.
This doesn't mean that you can't do it, there are different strategies. If you've got a finite and known set of columns, you can specify each possible column and then databind the rendered attribute of each one to hide and show it as appropriate. Another, often cleaner approach, is to build this subtree of UINodes in Java code.

JTable with different number of columns (packets)

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