Custom table model won't cast
Hi, I have a JTable with a custom table model that extends AbstractTableModel. I want to take the number of a selected table row and pass it to a method of my custom model to get back the original complex object represented by the row.
int x = mytable.getSelectedRow();
MyTableModel model = (MyTableModel)(mytable.getModel());
MyOwnClass orig = model.myConversionMethod(x);
Problem: when I call mytable.getModel() then cast it to my custom model class (so I can call this conversion method) I get a ClassCastException.
What am I doing wrong? Thanks in advance for any help/advice you can give.
Mike
Where is the table model created?Right after the JTable is created, I call...
mytable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
mytable.setModel(new SortFilterModel(new MyTableModel()));
Similar Messages
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JTable: Custom Table Model (pII)
As was explained in pI, I'm creating a custom table model to overcome a few pitfalls I came across using the DefaultTableModel class, such as aligning cells, and getting certain columns to return only numeric type data. However, I've come upon a few roadblocks myself.
How do I create each of the following methods:
insertRow(int ow, int column)
remove row(int row)
addRow(Object[] rowData)Assuming that I decide to allow the user to add a column to the table, how would I create the methodaddColumn(Object columnName, Object[] columnData)And also, as I'm creating a custom table model, would I need to replicate DefaultTableModel's methods that inform the listeners that a change has been made to the table?
Thanks!Thanks!
I just got this response. Anyways, I found another solution that was, interestingly, from one of your threads written in 2005.
This is what I did:
// Letting the JTable know what each column stores and should return by
// overloading the getColumnClass() method
public Class getColumnClass(int column)
if(recordsTable.getColumnName(column) == "Ranking")
return Integer.class;
/* Why do I keep ketting an IllegalArgumentException here? *
* It keeps saying it cannot format given object as a Number */
else if(recordsTable.getColumnName(column) == "Price (�) ")
return Float.class;
else
return getValueAt(0, column).getClass();
}However, another problem has arisen.
The if method for the int column (Ranking column) works okay, and is even right-aligned. The else if arguments for the Price (�) column however is returning an IllegalArgumentException. This I just cannot figure out.
Here's the code:package Practice;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.MenuShortcut;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent; // for MenuItem shortcuts
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane; // JTable added to it, aiding flexibility
import javax.swing.JTable; // The personally preferred GUI for this purpose
// Provides a basic implementation of TableModel
import javax.swing.table.DefaultTableModel;
// This class uses Vector to store the rows and columns of data, though
// programmer will be using LinkedLists
import java.util.LinkedList;
// User-defined classes
import Practice.MusicDatabase;
public class MusicBank extends Frame implements ActionListener
MusicDatabase mDBase;
Frame frame;
String title = "", // Frame's title
file = ""; // pathname of the file to be opened
// Declaring Menu and MenuItem variables
Menu recordM; // ...
// recordM
MenuItem newRecordR_MI, deleteRecordR_MI;
// Other irrelevant menus and sub items
DefaultTableModel recordDetails;
JTable recordsTable;
LinkedList musicList;
public MusicBank()
musicList = new LinkedList();
frame = new Frame(title);
frame.setMenuBar(menuSystem());
// Should user seek to close window externally
frame.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent we)
frame.dispose();
System.exit(0);
recordDetails = new DefaultTableModel();
// Creating the relevant columns
recordDetails.addColumn("Title");
recordDetails.addColumn("Identity");
recordDetails.addColumn("Music Company");
recordDetails.addColumn("Ranking");
recordDetails.addColumn("Price (�) ");
// Ensuring the table has at least one visible record (empty)
recordDetails.addRow(populateRow("", "", "", 0, 0.00f));
// Creating the table to display the data files (music record details)
recordsTable = new JTable(recordDetails)
// Letting the JTable know what each column stores and should return by
// overloading the getColumnClass() method
public Class getColumnClass(int column)
if(recordsTable.getColumnName(column) == "Ranking")
return Integer.class;
/* Why do I keep ketting an IllegalArgumentException here? *
* It keeps saying it cannot format given object as a Number */
else if(recordsTable.getColumnName(column) == "Price (�) ")
return Float.class;
else
return getValueAt(0, column).getClass();
// Creating the menus
public MenuBar menuSystem()
MenuBar bar = new MenuBar();
// Record menu and related items
recordM = new Menu("Record");
recordM.setShortcut(new MenuShortcut(KeyEvent.VK_R, false));
newRecordR_MI = new MenuItem("New record");
newRecordR_MI.setShortcut(new MenuShortcut(KeyEvent.VK_N, false));
deleteRecordR_MI = new MenuItem("Delete record");
deleteRecordR_MI.setShortcut(new MenuShortcut(KeyEvent.VK_D, false));
recordM.add(newRecordR_MI);
recordM.addSeparator();
recordM.add(deleteRecordR_MI);
// Enabling menus with functionality
newRecordR_MI.addActionListener(this);
deleteRecordR_MI.addActionListener(this);
// Adding menus and items to menu bar
bar.add(recordM);
return bar;
public void actionPerformed(ActionEvent ae)
if(ae.getSource() == newRecordR_MI)
newRecord();
else if(ae.getSource() == deleteRecordR_MI)
deleteRecord();
// Object that will be used, in conjunction with MusicDatabase's, to
// populate the JTable
// A record in a JTable is equivalent to an element in a LinkedList
public Object[] populateRow(String title, String name, String comp, int rank, float price)
// First, update the LinkedList
mDBase = new MusicDatabase(title, name, comp, rank, price);
musicList.add(mDBase);
// Then, update the table
// As the parameters of Object tableDetails can only take a String or
// object, rank and price will have to be cast as a String and later
// parsed to their original form before use.
String rankPT = ""+rank, pricePT = ""+price;
Object rowDetails[] = {title, name, comp, rankPT, pricePT};
return rowDetails;
public static void main(String args[])
MusicBank app = new MusicBank();
// Using the platform's L&F (if Win32, Windows L&F; Mac OS, Mac OS L&F,
// Sun, CDE/Motif L&F)
// For more on this, refer to the WinHelp Java tutorial by F. Allimont
try
UIManager.getSystemLookAndFeelClassName();
catch(Exception e)
JOptionPane.showMessageDialog(app,
"Failed to create the Windows Look and Feel for this program",
"Look and Feel (L&F) error",
JOptionPane.ERROR_MESSAGE);
app.frame.setSize(500, 500);
app.frame.setVisible(true);
// Placing frame in the centre of the screen on-loading
app.frame.setLocationRelativeTo(null);
// action methods per menu items
// Also, why do I keep getting an ArrayIndexOutOfBoundsException
// here? I do know what this exception is, and how it works, but just cannot
// understand what is causing it
public void newRecord()
// Before adding a new record, check if previous record has complete
// entries. If not, either display a message (JOptionPane) or disallow
// request (simply do nothing)
// Proceed based on assesment
if(queryState() == true)
// Inform user that all entries need to be filled in before a new
// record can be created
JOptionPane.showMessageDialog(this, // current frame
"There are incomplete cells in the table."+
"\nPlease fill these in before proceeding", // Message to user
"Incomplete entries", // Title
JOptionPane.ERROR_MESSAGE); // Relevant icon
else
// To ensure that both the linked list & the table are simultaneously
// updated, JOptionPane's input dialogs are used to temporarily store
// the data which is then inputted into both (linked list and JTable)
String titleN, identityN, companyN; int rankN; float priceN;
titleN = JOptionPane.showInputDialog(this, "Enter song title");
identityN = JOptionPane.showInputDialog(this, "Enter name of singer/band");
companyN = JOptionPane.showInputDialog(this, "Enter signed/unsigned company");
rankN = Integer.parseInt( JOptionPane.showInputDialog(this,
"Enter rank (a number)") );
System.out.println("\n JTable rows = "+recordDetails.getRowCount());
// Ensuring that the chosen rank is not already entered
/* Problem lies here */
for(int row = 1; row <= recordDetails.getRowCount(); ++row)
if((recordDetails.getValueAt(row, 4)).equals(""+rankN))
rankN = Integer.parseInt( JOptionPane.showInputDialog(this,
"That number's already chosen.\nPlease enter a rank ") );
priceN = Float.parseFloat( JOptionPane.showInputDialog(this, "Finally, enter price �") );
mDBase = new MusicDatabase(titleN, identityN, companyN, rankN, priceN);
musicList.add(mDBase);
recordDetails.addRow(populateRow(titleN, identityN, companyN, rankN,
priceN));
System.out.println("JTable rows after creation = "+
recordDetails.getRowCount());
// Enabling the delete record menu item (as necessary)
if((recordsTable.getRowCount()) > 0)
deleteRecordR_MI.setEnabled(true);
} // newRecord()
public void deleteRecord()
int selectedRow = recordsTable.getSelectedRow();
recordDetails.removeRow(selectedRow);
// Removing the element from the LinkedList's corresponding index
musicList.remove(selectedRow);
System.out.println("Existing rows = "+recordsTable.getRowCount());
// If there are no more rows, disallow user from trying to delete rows
if(selectedRow <= 0)
deleteRecordR_MI.setEnabled(false);
} // deleteRecord()
// Method to query if all cells have changed their states (empty or not)
public boolean queryState()
// Obtaining number of rows
int rows = recordDetails.getRowCount();
int columns = recordDetails.getColumnCount();
boolean isEmpty = false; // cell
System.out.println("Rows = "+rows);
System.out.println("Columns = "+columns);
try{
// Assessing all cells for complete entries
// This approach is flexible, rather than hardcoding the rows available,
// making it more reusable (assuming it will always be 5 columns)
for (int rowIndex = 0; rowIndex<=rows; ++rowIndex)
if((recordDetails.getValueAt(rowIndex, 1)).equals(""))
isEmpty = true;
else if((recordDetails.getValueAt(rowIndex, 2)).equals(""))
isEmpty = true;
else if((recordDetails.getValueAt(rowIndex, 3)).equals(""))
isEmpty = true;
else if((recordDetails.getValueAt(rowIndex, 4)).equals("0"))
isEmpty = true;
else if((recordDetails.getValueAt(rowIndex, 5)).equals("0.00"))
isEmpty = true;
catch(Exception e)
System.out.println(e.getMessage());
return isEmpty;
Now here is the code for the MusicDatabase class
package Practice;
class MusicDatabase
private String songTitle, identity, musicCompany;
private int rank;
private float priceF;
// Defining the constructor
public MusicDatabase(String title, String name, String company, int rankingInt, float price)
songTitle = title;
identity = name;
musicCompany = company;
rank = rankingInt;
priceF = price;
} // constructor
// Other methods
} // class MusicDatabaseSorry, but am not sure if these codes are executable, as where I am (a general library), JVM is not on the machine I am using. (Remember, i don't have ready acess to the Internet, so I could not use my machine, nor the facilities that had the JVM - unavailable to me at the time).
Thanks!
Reformer...
PS I do hope the code pasted was not too much. Kind regards.... -
JTable column headers not displaying using custom table model
Hi,
I'm attempting to use a custom table model (by extending AbstractTableModel) to display the contents of a data set in a JTable. The table is displaying the data itself correctly but there are no column headers appearing. I have overridden getColumnName of the table model to return the correct header and have tried playing with the ColumnModel for the table but have not been able to get the headers to display (at all).
Any ideas?
CheersClass PublicationTableModel:
public class PublicationTableModel extends AbstractTableModel
PublicationManager pubManager;
/** Creates a new instance of PublicationTableModel */
public PublicationTableModel(PublicationManager pm)
super();
pubManager = pm;
public int getColumnCount()
return GUISettings.getDisplayedFieldCount();
public int getRowCount()
return pubManager.getPublicationCount();
public Class getColumnClass(int columnIndex)
Object o = getValueAt(0, columnIndex);
if (o != null) return o.getClass();
return (new String()).getClass();
public String getColumnName(int columnIndex)
System.out.println("asked for column name "+columnIndex+" --> "+GUISettings.getColumnName(columnIndex));
return GUISettings.getColumnName(columnIndex);
public Publication getPublicationAt(int rowIndex)
return pubManager.getPublicationAt(rowIndex);
public Object getValueAt(int rowIndex, int columnIndex)
Publication pub = (Publication)pubManager.getPublicationAt(rowIndex);
String columnName = getColumnName(columnIndex);
if (columnName.equals("Address"))
if (pub instanceof Address) return ((Address)pub).getAddress();
else return null;
else if (columnName.equals("Annotation"))
if (pub instanceof Annotation) return ((Annotation)pub).getAnnotation();
else return null;
etc
else if (columnName.equals("Title"))
return pub.getTitle();
else if (columnName.equals("Key"))
return pub.getKey();
return null;
public boolean isCellEditable(int rowIndex, int colIndex)
return false;
public void setValueAt(Object vValue, int rowIndex, int colIndex)
}Class GUISettings:
public class GUISettings {
private static Vector fields = new Vector();
private static Vector classes = new Vector();
/** Creates a new instance of GUISettings */
public GUISettings() {
public static void setFields(Vector f)
fields=f;
public static int getDisplayedFieldCount()
return fields.size();
public static String getColumnName(int columnIndex)
return (String)fields.elementAt(columnIndex);
public static Vector getFields()
return fields;
}GUISettings.setFields has been called before table is displayed.
Cheers,
garsher -
Hi,
i m leaning JTable recently, following is an experimental code which i wrote, it has a custom table model and custom tablecellrenderer, the custom tablecellrender determine the column of # of Years greater or equal than 5 should display color green, less than 5 should display color red, it works well, however, the custom table model should be smart enough to know that the # of Years column contains numbers (which should generally be right aligned and have a particular format), it also should know that the Vegetarian column contains boolean values, which can be represented by check boxes, but it didn't, i don't know why, i have implement a getColumnClass method,
but it seems not work, have i make any mistakes? Any idea? Thanks
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import java.awt.Color;
import java.util.Vector;
public class CellRenderTestVector extends JFrame {
protected JTable table;
protected int width = 100;
protected MyCustomTableModel model;
public CellRenderTestVector() {
JPanel pan0 = new JPanel(new BorderLayout());
Container contentPane = getContentPane();
pan0.setPreferredSize(new Dimension(500,200));
model = new MyCustomTableModel();
table = new JTable();
table.setAutoCreateColumnsFromModel(false);
table.setModel(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
TableColumn column = null;
for (int i = 0; i < model.getColumnCount(); i++) {
DefaultTableCellRenderer renderer = new
ColoredTableCellRenderer();
column = new TableColumn(i,
width, renderer, null);
table.addColumn(column);
TableColumn t_column = table.getColumnModel().getColumn(2);
System.out.println(table.getColumnModel());
JScrollPane scrollPane = new JScrollPane(table);
pan0.add(scrollPane, BorderLayout.CENTER);
contentPane.add(pan0);
public class ColoredTableCellRenderer extends DefaultTableCellRenderer {
public void setValue(Object value) {
Color m_color;
Color GREEN = new Color(0, 128, 0);
Color RED = Color.red;
if (value instanceof Integer) {
Integer m_data = (Integer)value;
m_color = m_data.intValue() >= 5 ? GREEN : RED;
setForeground(m_color);
setText(m_data.toString());
else {
super.setValue(value);
public class Columndata {
protected String m_title;
public Columndata(String title) {
m_title = title;
public class Rowdata {
protected String fname;
protected String lname;
protected String sport_type;
protected Integer no_year;
protected Boolean vegetarian;
public Rowdata(String fn, String ln,
String sp, int ny, boolean vg) {
fname = fn;
lname = ln;
sport_type = sp;
no_year = new Integer(ny);
vegetarian = new Boolean(vg);
public class MyCustomTableModel extends AbstractTableModel {
protected final Columndata m_column[] =
{new Columndata("First Name"),
new Columndata("Last Name"),
new Columndata("Sport"),
new Columndata("# of Years"),
new Columndata("Vegetarian")
protected Vector m_vector;
public MyCustomTableModel() {
m_vector = new Vector();
setDefaultData();
public void setDefaultData() {
m_vector.removeAllElements();
m_vector.addElement(new Rowdata("Mary", "Campione",
"Snowboarding", 5, false));
m_vector.addElement(new Rowdata("Alison", "Huml",
"Rowing",3,true));
m_vector.addElement(new Rowdata("Kathy", "Walrath",
"Knitting",2, false));
m_vector.addElement(new Rowdata("Sharon", "Zakhour",
"Speed reading",20,true));
m_vector.addElement(new Rowdata("Philip", "Milne",
"Pool",10,false));
public int getColumnCount() {
return m_column.length;
public int getRowCount() {
return m_vector==null ? 0 : m_vector.size();
public String getColumnName(int col) {
return m_column[col].m_title;
public Object getValueAt(int nRow, int nCol) {
if (nRow < 0 || nRow>=getRowCount()) return "";
Rowdata row = (Rowdata)m_vector.elementAt(nRow);
switch (nCol) {
case 0: return row.fname;
case 1: return row.lname;
case 2: return row.sport_type;
case 3: return row.no_year;
case 4: return row.vegetarian;
return "";
public Class getColumnClass(int c) {
return getValueAt(0, c).getClass();
public static void createAndShowGUI() {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
JFrame f = new CellRenderTestVector();
f.setTitle("TableTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.pack();
f.setVisible(true);
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}You need to write your custom TableCellRenderes/Editors for each type. And don't forget to register your custom renderes via myTable.setDefaultRendere().
-
JButton in JTable with custom table model
Hi!
I want to include a JButton into a field of a JTable. I do not know why Java does not provide a standard renderer for JButton like it does for JCheckBox, JComboBox and JTextField. I found some previous postings on how to implement custom CellRenderer and CellEditor in order to be able to integrate a button into the table. In my case I am also using a custom table model and I was not able to create a clickable button with any of the resources that I have found. The most comprehensive resource that I have found is this one: http://www.java2s.com/Code/Java/Swing-Components/ButtonTableExample.htm.
It works fine (rendering and clicking) when I start it. However, as soon as I incorporate it into my code, the clicking does not work anymore (but the buttons are displayed). If I then use a DefaultTableModel instead of my custom one, rendering and clicking works again. Does anyone know how to deal with this issue? Or does anyone have a good pointer to a resource for including buttons into tables? Or does anyone have a pointer to a resource that explains how CellRenderer and CellEditor work and which methods have to be overwritten in order to trigger certain actions (like a button click)?
thanksYes, you were right, the TableModel was causing the trouble, everything else worked fine. Somehow I had this code (probably copy and pasted from a tutorial - damn copy and pasting) in my TableModel:
public boolean isCellEditable(int row, int col) {
//Note that the data/cell address is constant,
//no matter where the cell appears onscreen.
if (col < 3) {
return false;
} else {
return true;
}A pretty stupid thing when you want to edit the 3rd column... -
Custom table model, table sorter, and cell renderer to use hidden columns
Hello,
I'm having a hard time figuring out the best way to go about this. I currently have a JTable with an custom table model to make the cells immutable. Furthermore, I have a "hidden" column in the table model so that I can access the items selected from a database by their recid, and then another hidden column that keeps track of the appropriate color for a custom cell renderer.
Subject -- Sender -- Date hidden rec id color
Hello Pete Jan 15, 2003 2900 blue
Basically, when a row is selected, it grabs the record id from the hidden column. This essentially allows me to have a data[][] object independent of the one that is used to display the JTable. Instinctively, this does not seem right, but I don't know how else to do it. I know that the DefaultTableModel uses a Vector even when it's constructed with an array and I've read elsewhere that it's not a good idea to do what I'm trying to do.
The other complication is that I have a table sorter as well. So, when it sorts the objects in the table, I have it recreate the data array and then set the data array of the ImmutableTableModel when it has rearranged all of the items in the array.
On top of this, I have a custom cell renderer as well. This checks yet another hidden field and displays the row accordingly. So, not only does the table sort need to inform the table model of a change in the data structure, but also the cell renderer.
Is there a better way to keep the data in sync between all of these?To the OP, having hidden columns is just fine, I do that all the time.. Nothing says you have to display ALL the info you have..
Now, the column appears to be sorting properly
whenever a new row is added. However, when I attempt
to remove the selected row, it now removes a seemingly
random row and I am left with an unselectable blank
line in my JTable.I have a class that uses an int[] to index the data.. The table model displays rows in order of the index, not the actual order of the data (in my case a Vector of Object[]'s).. Saves a lotta work when sorting..
If you're using a similar indexing scheme: If you're deleting a row, you have to delete the data in the vector at the INDEX table.getSelectedRow(), not the actual data contained at
vector.elementAt(table.getSelectedRow()). This would account for a seemingly 'random' row getting deleted, instead of the row you intend.
Because the row is unselectable, it sounds like you have a null in your model where you should have a row of data.. When you do
vector.removeElementAt(int), the Vector class packs itself. An array does not. If you have an array, when you delete the row you must make sure you dont have that gap.. Make a new array of
(old array length-1), populate it, and give it back to your model.. Using Vectors makes this automatic.
Also, you must make sure your model knows the data changed:
model.fireTableDataChanged(); otherwise it has no idea anything happened..
IDK if that's how you're doing it, but it sounds remarkably similar to what I went thru when I put all this together.. -
JTable: Custom Table Model (pI)
This is a follow-up to thread http://forum.java.sun.com/thread.jspa?threadID=725162 and thread http://forum.java.sun.com/thread.jspa?threadID=725158.
As I'm hoping to have a table of 5 columns, where the 4th and 5th columns are for integer and float data types respectively, I am creating a custom table model under the assumption that I will not know beforehand the number of rows the table will contain.
Problems? Having not specified the cell contents of the table, since it will be pupulated by users unknown to me, I did not declare or initialize a variable similar to TableDemo's data variable of type Object (see the TableDemo tutorial http://java.sun.com/docs/books/tutorial/uiswing/components/example-swing/TableDemo.java). As such, I am unable to specify the return parameters for the getRowCount() and getValueAt(~, ~) methods.
To overcome this, I sought to replicate the example shown in TableDemo by doing the following:
Object[][] cell = {"", "", "", new Integer(0), new Float(0.00f)};
public int getRowCount()
returncell.length;
public Object getValueAt(int row, int column)
return cell[row][column];
//...I got the following errors:
pathname\CustomTableModel.java:line #: incompatible types
found: java.lang.String
required: java.lang.Object[]
and the errors continue...
So I tried
Object[] cell = {"", "", "", new Integer(0), new Float(0.00f)};
// ...However, I got this error:
C:\...\CustomTableModel.java:line #:array required, but java.lang.String found
return cell[row][column];
.......................... ^
I just want to set the return parameters for getRowCount() and getValueAt(~,~) in the custom table model I'm creating. How do I do this?
Cheers!
PS Thanks for reading this far...I decided to use the DefaultTableModel, after all. I was using it before, but at the time, i didn't know that certain things I wanted to accomplish, it could too.
Anyways, here's what I have been doing: http://forum.java.sun.com/thread.jspa?threadID=725861
Thanks nonetheless for your help. And by the way, my client is adamant that I use a LinkedList, rather than a Vector for this project. But nevertheless, thanks. -
Want to add rows from database in custom table model
Hello all,
I have written custom table model which has single blank row intially.
Once user clicks on button, i want to add more rows in custom table model and display them in JTable.
I have created JTable object as shown below.
Jtable patientTable = new JTable( new DiagnosticTableModel());
My custom tabel model is as shown below.
import javax.swing.table.AbstractTableModel;
public class DiagnosticTableModel extends AbstractTableModel
private String[] columnNames = {
"Date",
"Diagnosis",
"Severity",
"Medications"};
private String[][] data = {
public int getColumnCount()
return columnNames.length;
public int getRowCount()
return data.length;
public String getColumnName(int col)
return columnNames[col];
public Class getColumnClass(int col)
return getValueAt(0, col).getClass();
public Object getValueAt(int row, int col)
return data[row][col];
public boolean isCellEditable(int row, int col)
return true;
public void setValueAt(Object value, int row, int col)
data[row][col] = value.toString();
fireTableCellUpdated(row, col);
}Thanx a lot in advance.I have written custom table model which has single blank row intially.Why did you write a custom TableModel? The DefaultTableModel will work fine and it has methods that allow you to dynamically add rows to the table.
-
Custom Table Model from Default Table Model
I'm creating a customised table model to create a table with column header and empty rows.But it is throwing Component paint_imediatly error.If i pass in empty string to the row vector then setNumRows then no problem. If i do like this later it throws me error in my addNewRow method which was working fine before.Can anyone help?I would realy apreaciate it.Thank you.
KavithaThis must be your lucky day :)
Here is my version of an EditableTableModel which displays an emptyline as the last line
import java.io.*;
import java.util.*;
import javax.swing.table.*;
import javax.swing.event.*;
* Custom TableModel, allows addition and removal of records/rows and editting of existing values.
* it also keeps track over which rows have been altered.
* column 0 is a boolean indicating wheter or not to keep this row/record
* @author Maurice Marrink
* @version 1.0
public class EditableTableModel extends AbstractTableModel implements Serializable, TableModelListener
protected ArrayList keep,changed; //houden bij of een rij gedel moet worden en of ie is veranderd (false = delete)
protected ArrayList[] DATA;
protected int emptyLineIndex;
protected String[] kolomNamen;
protected Object[] kolomTypen; // bevat een object van dezelfde class als die kolom
protected int newRowsIndex; // houd bij vanaf welke rij niewe regels zijn toegevoegd ivm het opslaan in de db
protected int[]primecolumns; //houd bij welke kolommen ingevuld moeten worden voordat de volgende regel getoond wordt (default= kolom 1)
public EditableTableModel()
keep = new ArrayList(); //visible
changed=new ArrayList(); // not visisble
primecolumns=new int[0];
DATA=new ArrayList[0];
kolomNamen =new String[0];
kolomTypen=new Object[0];
emptyLineIndex=-1;
newRowsIndex=-1;
* the constructor, creates a new EditableTableModel
*@param data an array of ArrayLists each arrayList contains the values of an entire column
*@param names an array containg the names of the columns
*@param type an array containing Objects which correspond to the objects in the columns
public EditableTableModel(ArrayList[] data, String[] names, Object[] type)
keep = new ArrayList(); //visible
changed=new ArrayList(); // not visisble
primecolumns=new int[1];
primecolumns[0]=1;
DATA=data;
for(int i=0;i<getRowCount();i++)
keep.add(new Boolean(true));
changed.add(new Boolean(false));
kolomNamen=names;
kolomTypen=type;
emptyLineIndex=getRowCount()-1;
addNewLine();
newRowsIndex=emptyLineIndex; // nieuwe regels beginnen op de lege regel
addTableModelListener(this);
* @return the number of rows/records
public int getRowCount()
return DATA[0].size();
*@return the number of columns
public int getColumnCount()
return DATA.length+1;
* returns the object containing the value for this cell
* indexes start at 0 (wheter or not to keep this row), but the actual data starts at 1
*@param row the row in which the cell resides
*@param column the column in which the cell resides
*@return the value of the cell wrapped in the appropiate Object
public Object getValueAt(int row, int column)
if(column==0)
return keep.get(row);
else
return DATA[column-1].get(row);
* allows editing of an existing value
*@param value the new value, should be of the same Object Type as the existing one
*@param row the row nr of the cell
*@param col the column nr of the cell
public void setValueAt(Object value, int row, int col)
if(col==0)
keep.set(row,value);
else
DATA[col-1].set(row,value);
changed.set(row, new Boolean(true));
fireTableCellUpdated(row, col);
* adds a new "empty" row after all the PrimeColums of the last row have been filled with an acceptable value
*@see setPrimeColumns
protected void addNewLine()
try
for(int i=0;i<DATA.length;i++)
if(kolomTypen[i] instanceof Integer)
DATA.add(new Integer(-1));
else
if(kolomTypen[i] instanceof Boolean)
DATA[i].add(new Boolean(false));
else
if(kolomTypen[i] instanceof Long)
DATA[i].add(new Long(-1)); //displayed as "" by cellrenderer
else
DATA[i].add(kolomTypen[i].getClass().newInstance()); //nieuw object aanmaken van het type dat gespecificeerd is, Integers en Booleans moet een waarde meegegeven worden
keep.add(new Boolean(true));
changed.add(new Boolean(false));
emptyLineIndex++;
catch(Exception e)
e.printStackTrace();
public void tableChanged(TableModelEvent e)
if(e.getFirstRow()==emptyLineIndex)//alleen als de emptyLine ge?dit wordt een regel toevoegen
boolean primesfilled=true;
for(int i=0;i<primecolumns.length;i++)
if(getValueAt(emptyLineIndex,primecolumns[i]).equals(null) || getValueAt(emptyLineIndex,primecolumns[i]).toString().equals("")|| getValueAt(emptyLineIndex,primecolumns[i]).toString().equals("-1"))
primesfilled=false;
break;
if(primesfilled) //alleen als de primaire sleutel kolommen ingevuld zijn
addNewLine();
* returns the Class type of the Objects representing the column type
*@param c the column nr
public Class getColumnClass(int c)
if(c==0)
return new Boolean(true).getClass();
else
return kolomTypen[c-1].getClass();
*@param rowIndex the index of the row
*@param columnIndex the index of the column
*@return true if a cell is Editable,false otherwise (all cells are Editable)
public boolean isCellEditable(int rowIndex, int columnIndex)
return true;
* returns the name of the column
*@param column the column index
*@return a String containing the name of the column
public String getColumnName(int column)
if(column==0)
return "";
else
return kolomNamen[column-1];
*@return wheter or not 1 or rows is marked for deletion
public boolean deletionNeeded()
Boolean B;
for(int i=0;i<emptyLineIndex;i++)
B=(Boolean)keep.get(i);
if(!B.booleanValue())
return true;
return false;
* Deletes all rows which are marked for deletion
*@return the number of rows that have been deleted
public int deleteMarkedRows() // zou niets uit moeten maken of je eerst deleteMarkedRows() of isSavedToDB(true) aanroept
int aantalRows=0;
Boolean B;
for(int i=0;i<emptyLineIndex;i++)
B=(Boolean)keep.get(i);
if(!B.booleanValue())
if(deleteRow(i))
aantalRows++;
i--;
return aantalRows;
* deletes a single row
*@param row the row index
*@return true if the row was deleted, false otherwise
protected boolean deleteRow(int row)
boolean result=false;
if(row==emptyLineIndex) // emptyline kan niet gedelete worden
return result;
try
for(int j=0;j<DATA.length;j++)
DATA[j].remove(row);
changed.remove(row);
keep.remove(row);
emptyLineIndex--;
if(row < newRowsIndex)
newRowsIndex--;
result=true;
catch(Exception e)
e.printStackTrace();
return result;
* returns if the row has changed or not
*@param row the row index
*@return true if 1 or more cells in this row had their value changed or if 1 or more rows were added, false otherwise
public boolean hasChanged(int row)
Boolean B=(Boolean)changed.get(row);
return B.booleanValue();
* Methode waarmee men kan bepalen of 1 van de originele waarden ook veranderd is.
* Het geeft dus niet aan of er ook nieuwe rijen zijn toegevoegd.
public boolean hasChanged()
Boolean B;
for(int i=0;i<newRowsIndex;i++)
B=(Boolean)changed.get(i);
if(B.booleanValue())
return true;
return false;
* if true it sets all flags indicating a change to false, else nothing
*@param saved boolean indicating all changes are now to be considerd to be the original values, or not
public void isSavedToDB(boolean saved)
if(saved)
for(int i=0; i<changed.size();i++)
changed.set(i,new Boolean(false));
newRowsIndex=emptyLineIndex;
* @return the row nr. at which newly added entrys begin, updated after isSavedToDB(true) is called
public int getNewRowsIndex()
return newRowsIndex;
* allows the specification of certain columns that need to be filled in, if not a new row will not be made vissible
*@param columns an array containing the column indexes which must be set to a valid value
public void setPrimeColumns(int[] columns)
primecolumns=columns;
* allows retrieval of the PrimeColumns
*@return an arrayof int containing the column indexes
public int[] getPrimeColumns()
return primecolumns;
Ok some of the comments are in dutch go ahead an blame me :(
if you have any questions, just ask.
i also have a TableModel which can use automatic numbering
Oh numbers (currently only Integer and Long) are initiated wth a value of -1 if you want to display them as blank cells like i wanted to you modify a cellrenderer (or use mine)
Mr Mean -
Using custom table model with the Net Beans JTable
I am using the net beans editor to create an application. For the JTable that net beans provides, I would like to use my own Table Model instead of the default one that is provided. How do I specify to the form editor that I want to use my own TableModel instead of the DeafaultTableModel?
I am using the net beans editor to create an application. For the JTable that net beans provides, I would like to use my own Table Model instead of the default one that is provided. How do I specify to the form editor that I want to use my own TableModel instead of the DeafaultTableModel?
-
JTable with custom column model and table model not showing table header
Hello,
I am creating a JTable with a custom table model and a custom column model. However the table header is not being displayed (yes, it is in a JScrollPane). I've shrunk the problem down into a single compileable example:
Thanks for your help.
import javax.swing.*;
import javax.swing.table.*;
public class Test1 extends JFrame
public static void main(String args[])
JTable table;
TableColumnModel colModel=createTestColumnModel();
TestTableModel tableModel=new TestTableModel();
Test1 frame=new Test1();
table=new JTable(tableModel, colModel);
frame.getContentPane().add(new JScrollPane(table));
frame.setSize(200,200);
frame.setVisible(true);
private static DefaultTableColumnModel createTestColumnModel()
DefaultTableColumnModel columnModel=new DefaultTableColumnModel();
columnModel.addColumn(new TableColumn(0));
return columnModel;
static class TestTableModel extends AbstractTableModel
public int getColumnCount()
return 1;
public Class<?> getColumnClass(int columnIndex)
return String.class;
public String getColumnName(int column)
return "col";
public int getRowCount()
return 1;
public Object getValueAt(int row, int col)
return "test";
public void setValueAt(Object aValue, int rowIndex, int columnIndex)
}Edited by: 802416 on 14-Oct-2010 04:29
addedKleopatra wrote:
jduprez wrote:
See http://download.oracle.com/javase/6/docs/api/javax/swing/table/TableColumn.html#setHeaderValue(java.lang.Object)
When the TableColumn is created, the default headerValue is null
So, the header ends up rendered as an empty label (probably of size 0 if the JTable computes its header size based on the renderer's preferred size).nitpicking (can't resist - the alternative is a cleanup round in some not so nice code I produced recently <g>):
- it's not the JTable's business to compute its headers size (and it doesn't, the header's the culprit.) *> - the header should never come up with a zero (or near-to) height: even if there is no title shown, it's still needed as grab to resize/move the columns. So I would consider this sizing behaviour a bug.*
- furthermore, the "really zero" height is a longstanding issue with MetalBorder.TableHeaderBorder (other LAFs size with the top/bottom of their default header cell border) which extends AbstractBorder incorrectly. That's easy to do because AbstractBorder itself is badly implemented
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6459419
Thanks for the opportunity to have some fun :-)
JeanetteNo problem, thanks for the insight :) -
Custom Table Editor: values are not populated to the model
H,
I wrote a custom table renderer which uses JComboBox + editor, which seem to work (after editing, the displayed cell reflects the change) but after editing the table manually, the model is not altered when i call table.getModel();
The editor part is as simple as
class MPComboBoxEditor extends DefaultCellEditor {
private final JComboBox box;
public MPComboBoxEditor(JComboBox b) {
super(b);
this.box = b;
}The renderer:
public class CellRendererWithMPComboBox extends JLabel implements TableCellRenderer {
private final Context c;
private final JTable table;
private DefaultTableCellRenderer rend = new DefaultTableCellRenderer();
private JLabel label = new JLabel();
public CellRendererWithMPComboBox(Context c, JTable table) {
super();
this.c = c;
this.table = table;
* Set this renderer to the given column
* @param column
public void setRendererTo(int column) {
TableColumn col = table.getColumnModel().getColumn(column);
col.setCellEditor(new JComboBoxEditor(JComboBox(<some values>)));
col.setCellRenderer(this);
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (hasFocus && isSelected) {
if (isSelected) {
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
} else {
setForeground(table.getForeground());
setBackground(table.getBackground());
label.setText((value == null) ? "" : value.toString());
return label;
} else {
label.setText((value == null) ? "" : value.toString());
return label;
}the model simply extends DeafultTableModel to get formatted numbers.
@Override
@SuppressWarnings("unchecked")
public Object getValueAt(int row, int column) {
Object o = super.getValueAt(row, column);
Class t = getColumnClass(column);
if (!t.getName().equals("java.lang.Object")) {
if (o != null && (t.isAssignableFrom(Double.class) ||
t.isAssignableFrom(double.class) ||
t.isAssignableFrom(float.class) ||
t.isAssignableFrom(Float.class))) {
return FormatNumber.formatDezimal(Double.valueOf(o.toString()));
} else {
return o;
} else {
return o;
}Do i need to override some setValueAt method in the editor/renderer or something?
Thanks one more time!
Regards,
AndreasI don't see any getModel() in your code extract. If the renderer renders it right after edition, then the value is probably correct in the model.
Also, remember [this thread|http://forums.sun.com/thread.jspa?threadID=5396048], where it appeared you were not clear about which model you were looking at.
Do i need to override some setValueAt method in the editor/renderer or something?No. But have you overridden the model's setValueAt?
Edited by: jduprez on Jul 15, 2009 4:56 PM -
Importing a model from a configurator to a custom table
Hi,
I'm new to Configurator.
Can someone please advice in detail how to import all possible combinations from a model in the configurator to a custom table?
I have created a custom table based on the items in the model.
I have also written a CIO which displays all the possible combinations in a html page when a button is clicked.
What i want is, how to connect to a database and import into the custom table.
Any Help Appreciated.
Thanks in advance.
--PKHi,
I read those documents (they are similar), but they don't say much about the web dynpro. There is another document saying I should add my class as an external jar to my project, but it still doesnt work. The errors I get are in the following classes:
IPublic<Custom Controller>.java
Internal<Custom Controller>.java
The errors are:
Clients (my class) cannot be resolved or is not a type
gen_modelInstance cannot be resolved
Any thoughts?
Lionel -
Importing data from a model to a custom table
Hi,
I'm new to Configurator.
Can someone please advice in detail how to import all possible combinations from a model in the configurator to a custom table?
I have created a custom table based on the items in the model.
I have also written a CIO which displays all the possible combinations in a html page when a button is clicked.
What i want is, how to connect to a database and import into the custom table.
Any Help Appreciated.
Thanks in advance.
--PKPK,
You probably meant to post this in one of the E-Business Suite forums. This forum is for JDev ;) Try the [url http://forums.oracle.com/forums/forum.jspa?forumID=413]Configurator Forum
John -
Issue in creating a custom data model from BP
Hi Team
We have a requirement to create a custom data model by copying data model BP. I have successfully created new data model ZP . I have copied the UI for searching from BP. Issue is when i search a business partner ideally it should not display any entries because i have just created the data model, But it is taking entries from BP and getting displayed. Please let me know how to map data model to search UI. I dont see option USMD_MODEL hereHi Imran,
actually that is not an issue but a designed feature. I'm afraid that you need to re-think your whole project. The explanations is rather simple:
Data model BP in MDG is a so called Re-Use Area data modell. This means that active data (records that are currently not stored in a change request) are saved in existing SAP ERP data base tables like BUT000 for the business partner master data and LFA1 or KNA1 for Vendor or Customer master data.
If you copy data model BP to ZP you still refer to the same active area. You will always find the same active objects - no matter which data model you are actually using for the user interface. The only difference wil occur for objects being currently processed in a change request. In that case a separation between BP and ZP is possible. But this won't help to solve your issue.
From SAP side I can only recommend not to copy BP but to find a different way of integrating your project needs into BP.
Best regards
Michael
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