About JTable ...removing one Column
How do i remove one Column from the JTable?
Thanks
TableColumnModel tcm = table.getColumnModel().
tcm.remove( tcm.getColumn(...) );This only removes the column from the view of the table. The data is still stored in the TableModel.
Similar Messages
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Remove JTable row and column in one event
Hello,
I 've using matrix table in one application.
i need to remove both column and row in single event.
For this i construct
JTable(data[][], header[]);
because dynamically increase data's and header's
What can i do for this?Create a method that does:
DefaultTableModel model = (DefaultTableModel)table.getModel();
model.removeRow(...)
model.setRowCount(...)
Read the DefaultTableModel API for more information. -
How to get all the values in one column of a JTable
How to get all the values in one column of a JTable as a Collection of String.
I don;t want to write a for loop to say getValueAt(row, 1) eg for 2nd column.I don;t want to write a for loop to say getValueAt(row, 1) eg for 2nd column. You could always write a custom TableModel that stores the data in the format you want it. It would probably be about 50 lines of code. Or you could write a loop in 3 lines of code. I'll let you decide which approach you want to take.
-
How to change font in just one column of JTable
I have a table with 4 column.
I want to have Courier font in column number 2, and Arial in columns number 1, 3 and 4.
With:
table.setFont(new Font("Courier New", Font.PLAIN, 12));
I can set fonts in all columns but how to set font in just one column.
Thanks
SrdanHi,
there are 2 methods of JTable where every rendering resp. editing component "comes" through - prepareRenderer(...) and prepareEditor(....) - by overwriting this methods and calling its super method first you get the component and can manipulate it before you return it. This component is exactly that, what is used for rendering resp. editing afterwards.
greetings Marsian -
Simulating one column using two columns in a JTable
What I need to do is "join" the two first columns of a JTable...
What do I mean by saying "join" ?
I want to make dissapear the right border of the first column, and the same thing for the left border of the second column, also do both things for the column headers of that two columns.
All that to simulate having one column when there's actually two differents columns.
How can i do that ? Thanks !Make a TableModel that filters your original table model.
See JTable.setModel.
public class MergedColumnsTableModel extends javax.swing.table.AbstractTableModel
javax.swing.TableModel model;
int[] columnSpans;
* Assume for simplicity that model does not change (no columns inserted/deleted).
public MergedColumnsTableModel(javax.swing.TableModel model) {
this.model = model;
columnSpans = new int[model.getColumnCount()];
for (int columnIndex = 0; columnIndex < columnSpans.length; ++columnIndex) {
columnSpans[columnIndex] = 1;
public void merge2(int columnIndex) {
int leftSpan = columnSpans[columnIndex];
int rightSpan = columnSpans[columnIndex + leftSpan];
columnSpans[columnIndex + leftSpan] = 0;
columnSpans[columnIndex] += rightSpan;
public int getRowCount() {
return model.getRowCount();
public int getColumnCount() {
int n = 0;
for (int i = 0; i < columnSpans.length; ++i) {
if (columnSpans[i] != 0) {
++n;
return n;
public Object getValueAt(int row, int column) {
int n = 0;
for (int i = 0; i < columnSpans.length; ++i) {
if (columnSpans[i] != 0) {
if (n == column) { // We are at the column
return model.getValueAt(row, i);
++n;
} -
JTable - One Column Heading for Two Columns
Can you adjust the default JTable to have one column heading for two columns of data? Is there a simple span command? I've looked at the api for JTable and JTableHeader and didn't see anything, is there something I'm missing? Any help would be appreciated.
What i am trying to accomplish is have column 'E' span 2 columns.
This is my code thus far, however it give the error from my pryor message. I am pretty sure it is because I'm using and Object[][] and a String[] instead of Vectors. What corrections do I need to make in order for my goal of:
[ A ][ B ][ C ][ D ][ E ][ F ][ G ]
[ 1 ][ 2 ][ 3 ][ 4 ][5][6][ 7 ][ 8 ]
Object[][] data = new Object[ROWS][COLUMNS];
String[] columnNames = {"A","B","C","D","E","E","F","G"};
table = new JTable(data, columnNames);
table.setBackground(Color.white);
table.addKeyListener(this);
DefaultTableCellRenderer d = new DefaultTableCellRenderer();
d.setHorizontalAlignment(JLabel.CENTER);
table.setDefaultRenderer(table.getColumnClass(0),d);
for (int i = 0; i < table.getColumnCount(); i++){
TableColumn aColumn = header.getColumnModel().getColumn(i);
TableCellRenderer renderer = aColumn.getHeaderRenderer();
if (renderer == null) {
renderer = new DefaultTableCellRenderer(){
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column){
JTableHeader header = table.getTableHeader();
if (header != null) {
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
setHorizontalAlignment(JLabel.CENTER);
setText((value == null) ? "" : value.toString());
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
return this;
aColumn.setHeaderRenderer(renderer); -
Both of my iphones are in my icloud. The one I turned in last night, and the iphone6 I purchased. Can I remove one safely from my icloud? I keep getting warnings about my storage space.
Hello racegirl3998,
Welcome to Apple Support Communities.
Congratulations on your new iPhone 6 purchase! It sounds like you want to know how to free up some iCloud storage space because you’re seeing an alert related to it on your new device. Take a look at the article linked below which outlines a few options for freeing up iCloud storage space.
iCloud: iCloud storage management overview
Cheers,
-Jason -
Hi,
I'm programming in Java since 5 months ago. Now I'm developing an application that uses tables to present information from a database. This is my first time handling tables in Java. I've read Sun's Swing tutorial about JTable, and several information on other websites, but they limit to table's syntax and not in best practices.
So I decided what I think is a proper way to handle data from a table, but I'm not sure that is the best way.Let me tell you the general steps I'm going through:
1) I query employee data from Java DB (using EclipseLink JPA), and load it in an ArrayList.
2) I use this list to create the JTable, prior transformation to an Object[][] and feeding this into a custom TableModel.
3) From now on, if I need to search an object on the table, I search it on the list and then with the resulting index, I get it from the table. This is possible because I keep the same row order on the table and on the list.
4) If I need to insert an item on the table, I do it also on the list, and so forth if I'd need to remove or modify an element.
Is the technique I'm using a best practice? I'm not sure that having to keep synchronized the table with the list is the better way to handle this, but I don't know how I'd deal just with the table, for instance to efficiently search an item or to sort the table, without doing that first on a list.
Are there any best practices in dealing with tables?
Thank you!
Francisco.Hi Joachim,
What I'm doing now is extending DefaultTableModel instead of implementing AbstractTableModel. This is to save implementing methods I don't need and because I inherit methods like addRow from DefaultTableModel. Let me paste the private class:
protected class MyTableModel extends DefaultTableModel {
private Object[][] datos;
public MyTableModel(Object[][] datos, Object[] nombreColumnas) {
super(datos, nombreColumnas);
this.datos = datos;
@Override
public boolean isCellEditable(int fila, int columna) {
return false;
@Override
public Class getColumnClass(int col) {
return getValueAt(0, col).getClass();
}What you are suggesting me, if I well understood, is to register MyTableModel as a ListSelectionListener, so changes on the List will be observed by the table? In that case, if I add, change or remove an element from the list, I could add, change or remove that element from the table.
Another question: is it possible to only use the list to create the table, but then managing everything just with the table, without using a list?
Thanks.
Francisco. -
JTable: Easy groupable column headers with hideable columns
Hi All,
I have a requirement to make a JTable which displays
columns with 2 values - a current value and an old one.
The old value can be hidden or shown by user preference.
The values are not editable. The 2 values have a single
heading.
I've been mucking about with GroupableTableHeader and
HideableTableColumnModel and all that. This way of
solving the problem requires siginificant coding.
Then I had an idea - just use the TableCellRenderer to
make it look like 2 columns ! This fits my requirements
and is much simpler.
So for anyone who has the same requirement, here is
some sample code. I think you'll all agree that in my
specific case it is a very good way of providing the needed
functionality.
Here is the sample code:
import javax.swing.*;
import javax.swing.border.AbstractBorder;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import java.awt.*;
import java.awt.event.ActionEvent;
public class DoubleColumnTable extends JTable {
private boolean secondValueVisible = true;
public DoubleColumnTable() {
super();
setModel(new AbstractTableModel() {
public String getColumnName(int column) {
return column + "";
public int getColumnCount() {
return 5;
public int getRowCount() {
return 5;
public Object getValueAt(int rowIndex, int columnIndex) {
return new Integer[]{new Integer(rowIndex), new Integer(columnIndex + 10)};
setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
Integer[] twoValues = (Integer[])value;
JPanel panel = new JPanel();
if (secondValueVisible) {
panel.setLayout(new GridLayout(0, 2));
JLabel firstLabel = new JLabel(twoValues[0].toString(), JLabel.CENTER);
JLabel secondLabel = new JLabel(twoValues[1].toString(), JLabel.CENTER);
secondLabel.setBackground(Color.lightGray);
secondLabel.setOpaque(true);
secondLabel.setBorder(new LeftBorder());
panel.add(firstLabel);
panel.add(secondLabel);
} else {
panel.setLayout(new GridLayout(0, 1));
JLabel firstLabel = new JLabel(twoValues[0].toString(), JLabel.CENTER);
panel.add(firstLabel);
return panel;
private void toggle() {
secondValueVisible = !secondValueVisible;
repaint();
class LeftBorder extends AbstractBorder {
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
g.setColor(Color.gray);
g.drawLine(x, y, x, height);
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setSize(300, 300);
frame.setLocation(300, 200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container contentPane = frame.getContentPane();
final DoubleColumnTable table = new DoubleColumnTable();
contentPane.add("North", new JButton(new AbstractAction("Toggle") {
public void actionPerformed(ActionEvent e) {
table.toggle();
contentPane.add("Center", new JScrollPane(table));
frame.setVisible(true);
}Message was edited by:
NY_Consultant
Message was edited by:
NY_Consultant
Message was edited by:
NY_ConsultantThis should read
"I have a table with column headers and a row headers using a single column from a second table." -
JTable without headers - column resizing
I have a simple problem: a JTable with 3 columns, and NO HEADERS.
I want the middle column ONLY to be resized when the WINDOW is resized. The other two columns should remain of fixed size.
Is there a simple answer?
Many thanks for any help,
george33Thank you Thomas for your prompt reply. I have eliminated the headers and automatic resizing using:
myTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
JTableHeader th=myTable.getTableHeader();
th.setReorderingAllowed(false);
th.setResizingAllowed(false);
jth.setPreferredSize(new Dimension(0, 0)); //remove headers
This works fine as far as eliminating resizing of all columns and removing the headers.
What I cannot work out is how to ensure that only the middle column is resized when the window is resized.
You refer to a component listener. Which componenent should I attach the listener to?
How can I make two columns of fixed size and one of variable size, and only when the window is resized?
thanks for your help
George33 -
How we can remove one authorization object from multiplt roles
How we can remove one authorization object from multiplt roles
> Correct me if I am wrong !!
O.K., Here I go
> But if the object is maintained in SU24 and if you use Expert mode for generation of the role then again those objects may be pulled.(make sure you never use expert mode once you delete the objects)
Actually using expert mode and choosing 'edit old status' is the only way to avoid objects being 'pulled in' after menu changes.
> As jurjen said, you may download the tables and instead of deleting the object from the excel sheet, change the value of the object in column "DELETED" = X, by doing this only the objects get inactivated(but remain in PFCG).
I am not speaking of downloading tables but about downloading roles from PFCG. This will not get you a spreadsheet but a flat textfile. If you whish to set the object status to deleted you'll have to swap the space on position 207, right behind the 'U, S, G' flag, with an 'X' for all corresponding lines.
Jurjen -
I have one column in dataTable. I want to remove it and add new one.
But it can never be removed. Pls help.
JTable dataTable = new JTable();
dataTable.removeColumn(dataTable.getColumnModel().getColumn(0));
dataTable.revalidate();
dataTable.getDefaultTableModel.addColumn("Code");Maybe you must call a fireXxxChanged method in your table Model (assuming your table Model extends one of the Standard table models)
-
In the app "Numbers" I want to paste in many rows in to columns. And each row separated. Now it's getting all in one column when I try to paste.
Fact is that I have a 4 pages list with about 50 rows of single words and I want all that in columnsHey joshuafromisr,
If you resintall iTunes, it should fix the issue. The following document will go over how to remove iTunes fully and then reinstall. Depending on what version of Windows you're running you'll either follow the directions here:
Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
http://support.apple.com/kb/HT1925
or here:
Removing and reinstalling iTunes, QuickTime, and other software components for Windows Vista or Windows 7
http://support.apple.com/kb/HT1923
Best,
David -
How to make only one column non reorderble
I want to make only one column (Column 0) of my JTable non reorderble.
I also want to make the same column non resizable and I want to give it a specific size.
Please help me on this?I have implemented a RowHeaderTable class which displays 1, 2, 3, ... in the first column. The column is in the scrollpane's RowHeaderView, so it is not resizable nor reorderable. But its width can be set in your code. Maybe this is what you need.
Use the class the same way you use a JTable, except 3 added methods:
getScrollPane();
setMinRows(int r);
setRowHeaderWidth(int w);
Note: The table works perfectly in skinless L&F, such as the default java L&F. It looks ugly in Liquid L&F because I don't know how to steal column header's UI to use on a JList. If someone can help me on this one, I thank you in advance.
* RowHeaderTable.java
* Created on 2005-3-21
* Copyright (c) 2005 Jing Ding, All Rights Reserved.
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies.
* JING DING MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
* SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. JING DING
* SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT
* OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
import java.awt.BorderLayout;
import java.awt.Component;
import javax.swing.AbstractListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ListCellRenderer;
import javax.swing.UIManager;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableModel;
* @author Jing Ding
public class RowHeaderTable extends JTable {
private int minRows = 10; // Minimum size of the row header.
private static final int DEFAULT_WIDTH = 30;
private JScrollPane jsp;
// The row header is a JList with the same appearance as the column header.
private JList rowHeader;
// Repaint row header whenever the table inserts or deletes rows.
private TableModelListener tmListener = new TableModelListener(){
public void tableChanged(TableModelEvent e){
if(e.getType() != TableModelEvent.UPDATE)
rowHeader.repaint();
/** Create a new instance of RowHeaderTable.
* @param model
public RowHeaderTable(TableModel model){
setModel(model);
initializeHeader();
jsp = new JScrollPane(this);
jsp.setRowHeaderView(rowHeader);
private void initializeHeader(){
rowHeader = new JList(new AbstractListModel(){
public int getSize(){ return Math.max(getModel().getRowCount(), minRows); }
public Object getElementAt(int index){ return "" + ++index; }
setRowHeaderWidth(DEFAULT_WIDTH);
rowHeader.setFixedCellHeight(getRowHeight());
rowHeader.setCellRenderer(new TableRowHeaderRenderer());
public void setRowHeaderWidth(int w){
rowHeader.setFixedCellWidth(w);
public void setMinRows(int m){ minRows = m; }
public void setModel(TableModel model){
super.setModel(model);
model.addTableModelListener(tmListener);
/**Use this method to get the scrollPane, instead of new JScrollPane(table).
* @return
public JScrollPane getScrollPane(){ return jsp; }
protected class TableRowHeaderRenderer implements ListCellRenderer{
TableCellRenderer colHeaderRenderer;
public TableRowHeaderRenderer(){
JTableHeader header = getTableHeader();
TableColumn aColumn = header.getColumnModel().getColumn(0);
colHeaderRenderer = aColumn.getHeaderRenderer();
if(colHeaderRenderer == null)
colHeaderRenderer = header.getDefaultRenderer();
public Component getListCellRendererComponent(JList list, Object value,
int index, boolean isSelected, boolean hasFocus){
return colHeaderRenderer.getTableCellRendererComponent(
RowHeaderTable.this, value, isSelected, hasFocus, -1, -1);
public static void main(String[] args){
try {
UIManager.setLookAndFeel("com.birosoft.liquid.LiquidLookAndFeel");
}catch (Exception e){ e.printStackTrace(); }
String[] columnNames = {"First Name",
"Last Name",
"Sport",
"# of Years",
"Vegetarian"};
Object[][] data = {
{"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)},
{"Alison", "Huml", "Rowing", new Integer(3), new Boolean(true)},
{"Kathy", "Walrath", "Knitting", new Integer(2), new Boolean(false)},
{"Sharon", "Zakhour", "Speed reading", new Integer(20), new Boolean(true)},
{"Philip", "Milne", "Pool", new Integer(10), new Boolean(false)}
DefaultTableModel dtm = new DefaultTableModel(data, columnNames);
RowHeaderTable rht = new RowHeaderTable(dtm);
rht.setMinRows(0);
JFrame frame = new JFrame("RowHeaderTable Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(rht.getScrollPane(), BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
dtm.addRow(new Object[]{"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)});
dtm.addRow(new Object[]{"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)});
dtm.addRow(new Object[]{"Mary", "Campione", "Snowboarding", new Integer(5), new Boolean(false)});
} -
I want to write a script or Automator workflow/app that automatically emails a random shortcut of the day to three recipients. The source is from an Excel spreadsheet. One column is the shortcut, and the second column is the definition. Anyone have similar experience and know that this would work?
I have had a first stab at the script, below. It uses a file to store the shortcuts and command [descriptions]. You should be able to see from the script annotations how to add a new one. (I populated 1-4 with real data, but got lazy after that, so you have a few placeholders to work with first.
As I have noted, once you are happy that you have all the data in the file, you can comment out part of the script for ongoing use. (BTW, my reluctance to use Excel is that I don't currently have it installed and I don't want to offer wrong advice. If you have Numbers, I do have that and could probably modify to work with a spreadsheet from there. This might be especially useful if you have the data already sitting in Excel.)
A few things came-up whilist I was writing the script:
1. Currently, all recipients will not only get the same tip at the same time, but they will see the names and email addresses of the others who receive them. It is possible to modify this.
2. I have added a property gRandomCheck which keeps track of which shortcut has already been used (since the last time the script was compiled. This will prevent the same tip being sent more than once. When all tips have been sent once, the script will alert you and not send anything until reset. It does not check on a per-addressee basis (which would be a refinement). (If you add a new addressee at this stage, the whole process will start again, and you may not really want this to be the behaviour.)
3. The way that I have built the list, commandList, is deliberately cumbersome - it's for the sake of clarity. If you prefer, you can construct the whole list as {{shortcut:"X", command:"X"}, {shortcut:"Y", command:"Y"}}
Have a look - I am sure you will have questions!
SCRIPT STARTS HERE Paste the following lines (thru the end) into a new AppleScript Editor document and press RUN
--The property gRandomCheck persists between runs and is used to stop sending the same hint twice.
property gRandomCheck : {}
--I am defining a file on the desktop. It doesn't have to be in this location
set theFolder to path to desktop
set commandFile to (theFolder as text) & "CommandFile.csv"
--(* Unless you need to change the file contents you do not need to write to it each time. Remove the "--" on this line and before the asterisk about 18 lines below
--Follow this format and enter as many records as you like on a new line - each with a unique name
set record1 to {shortcut:"Z", command:"Undo"}
set record2 to {shortcut:"R", command:"Record"}
set record3 to {shortcut:"⇧R", command:"Record Toggle"}
set record4 to {shortcut:"⌘.", command:"Discard Recording & Return to Last Play Position"}
set record5 to {shortcut:"X", command:"x"}
set record6 to {shortcut:"X", command:"x"}
set record7 to {shortcut:"X", command:"x"}
set record8 to {shortcut:"X", command:"x"}
set record9 to {shortcut:"X", command:"x"}
set record10 to {shortcut:"X", command:"x"}
set record11 to {shortcut:"X", command:"x"}
set record12 to {shortcut:"X", command:"x"}
set record13 to {shortcut:"X", command:"x"}
--Make sure you add the record name before randomCheck:
set commandList to {record1, record2, record3, record4, record5, record6, record7, record8, record9, record10, record11, record12, record13}
--This part writes the above records to the file each time.
set fileRef to open for access commandFile with write permission
set eof of fileRef to 0
write commandList to fileRef starting at eof as list
close access fileRef
--remove "--" here to stop writing (see above)*)
--This reads from the file
set fileRef to open for access commandFile with write permission
set commandList to read fileRef as list
close access fileRef
--Here's where the random record is chosen
set selected to 0
if (count of gRandomCheck) is not (count of commandList) then
repeat
set selected to (random number from 1 to (count of commandList))
if selected is not in gRandomCheck then
set gRandomCheck to gRandomCheck & selected
exit repeat
end if
end repeat
else
display dialog "You have sent all shortcuts to all recipients once. Recompile to reset"
return
end if
--This is setting-up the format of the mail contents
set messageText to ("Shortcut: " & shortcut of record selected of commandList & return & "Command: " & command of record selected of commandList)
tell application "Mail"
--When you're ready to use, you probably will not want Mail popping to the front, so add "--" before activate
activate
--You can change the subject of the message here. You can also set visible:true to visible:false when you are happy all is working OK
set theMessage to (make new outgoing message with properties {visible:true, subject:"Today's Logic Pro Shortcut", content:messageText})
tell theMessage
--You can add new recipients here. Just add a new line. Modify the names and addresses here to real ones
make new to recipient with properties {name:"Fred Smith", address:"[email protected]"}
make new to recipient with properties {name:"John Smith", address:"[email protected]"}
--When you are ready to start sending, remove the dashes before "send" below
--send
end tell
end tell
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