Remove and add a columns in JTable

Use the DefaultTableModel to do basic funtions like adding rows and columns:

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import java.io.*;

import javax.swing.*;

import javax.swing.event.*;

import javax.swing.table.*;

public class TableRowColumn extends JFrame

{

private final static String LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

JTable table;

DefaultTableModel model;

JPanel buttonPanel;

JButton button;

public TableRowColumn()

{

// Create table

Object[][] data =

{

{new Integer(1), "A"},

{new Integer(2), "B"},

{new Integer(3), "C"}

};

String[] columnNames = {"Number","Letter"};

model = new DefaultTableModel(data, columnNames);

table = new JTable(model)

{

public boolean isCellEditable(int row, int column)

{

return true;

}

};

table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);

table.setPreferredScrollableViewportSize(table.getPreferredSize());

table.getColumnModel().getColumn(0).

setCellRenderer( table.getDefaultRenderer(Integer.class) );

// Add table and a Button panel to the frame

final JScrollPane scrollPane = new JScrollPane( table );

getContentPane().add( scrollPane, BorderLayout.CENTER );

buttonPanel = new JPanel();

getContentPane().add( buttonPanel, BorderLayout.SOUTH );

button = new JButton( "Add Row" );

button.setMnemonic('A');

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

model.addRow( createRow() );

int row = table.getRowCount() - 1;

table.changeSelection(row, 0, false, false);

table.requestFocusInWindow();

table.scrollRectToVisible(table.getCellRect(row, 0, true) );

}

});

button = new JButton( "Insert Row" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

model.insertRow( 0, createRow() );

table.changeSelection(0, 0, false, false);

table.requestFocusInWindow();

table.scrollRectToVisible(table.getCellRect(0, 0, true) );

}

});

button = new JButton( "Empty Row" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

model.setRowCount( model.getRowCount() + 1 );

int row = table.getRowCount() - 1;

table.changeSelection(row, 0, false, false);

table.requestFocusInWindow();

}

});

button = new JButton( "Add Column" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String header = "Col" + (table.getColumnCount() + 1);

model.addColumn( header );

header = "Col" + (table.getColumnCount() + 1);

model.addColumn( header );

table.moveColumn(table.getColumnCount() - 1, 0);

table.requestFocusInWindow();

}

});

button = new JButton( "Add Column & Data" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

String header = "Col" + (table.getColumnCount() + 1);

int rows = table.getRowCount();

String[] values = new String[rows];

for (int j = 0; j < rows; j++)

{

values[j] = Integer.toString(j);

}

model.addColumn( header, values );

table.requestFocusInWindow();

}

});

button = new JButton( "Add Column - No Reordering" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

// Use this method when you don't want existing columns

// to be rebuilt from the model.

// (ie. moved columns will not be reordered)

table.setAutoCreateColumnsFromModel( false );

String header = "Col" + (table.getColumnCount() + 1);

model.addColumn( header );

// AutoCreate is turned off so create table column here

TableColumn column = new TableColumn( table.getColumnCount() );

column.setHeaderValue( header );

table.addColumn( column );

// These won't work once setAutoCreate... has been set to false

buttonPanel.getComponent(3).setEnabled( false );

buttonPanel.getComponent(4).setEnabled( false );

table.requestFocusInWindow();

}

});

button = new JButton( "Remove Last Column" );

buttonPanel.add( button );

button.addActionListener( new ActionListener()

{

public void actionPerformed(ActionEvent e)

{

int columns = model.getColumnCount();

if (columns > 0)

{

if (!table.getAutoCreateColumnsFromModel())

{

int view = table.convertColumnIndexToView(columns - 1);

TableColumn column =

table.getColumnModel().getColumn(view);

table.getColumnModel().removeColumn( column );

}

model.setColumnCount( columns - 1 );

}

table.requestFocusInWindow();

}

});

JTable lineTable = new LineNumberTable( table );

scrollPane.setRowHeaderView( lineTable );

}

private Object[] createRow()

{

Object[] newRow = new Object[2];

int row = table.getRowCount();

newRow[0] = Integer.toString(row + 1);

row = (row % 26) + 1;

newRow[1] = LETTERS.substring(row-1, row);

return newRow;

}

public static void main(String[] args)

{

TableRowColumn frame = new TableRowColumn();

frame.setDefaultCloseOperation( EXIT_ON_CLOSE );

frame.pack();

frame.setLocationRelativeTo( null );

frame.setVisible(true);

}

}

camickra at 2007-7-12 3:10:17 >

By the way I looked again in your program without compiling it.

As far as I understood it is removing the last columns and adding the new columns at the of the table ,but what I need is to put it in the middle or to drop it from the start.

I think what you gave me I already saw in the forum and it is not what I wanted!

amnonma at 2007-7-12 3:10:17 >