Develop Reference

JButton not re-enabling when selecting a row in JTable

I'm trying to set a button in enabled(false) when I create it, and when I select any row on the Jtable, that button goes enabled(true).
Logic is pretty simple here, but for some reason, it doesn't quite work, the button never gets into enabled(true).
JButton btnIniciarReparacin = new JButton("INICIAR REPARACI\u00D3N");
btnIniciarReparacin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tiempoStart = (int) (System.currentTimeMillis() / 1000L);
btnIniciarReparacin.setEnabled(false);
}
});
btnIniciarReparacin.setFont(new Font("SansSerif", Font.BOLD, 13));
btnIniciarReparacin.setBackground(new Color(231, 111, 81));
btnIniciarReparacin.setBounds(129, 625, 254, 50);
frame.getContentPane().add(btnIniciarReparacin);
int row = table.getSelectedRow();
//Comprobamos si hemos cogido algo de la tabla y si los botones están encendidos
if (table.isRowSelected(row)) {
btnIniciarReparacin.setEnabled(true);
} else {
btnIniciarReparacin.setEnabled(false);
}

Swing GUI's work by your adding listeners to events and then responding to state changes within the listener.
You appear to be checking the row selection state in code where you create your components, and that will never work since it only checks the state once, and before the user has had a chance to make a selection. Instead, you need to use a listener on your JTable, more specifically a ListSelectionListener that you add to the JTable's selection model that you get via table.getSelectionModel().addListSelectionListener(...)
Also note that this:
int row = table.getSelectedRow();
if (table.isRowSelected(row)) {
btnIniciarReparacin.setEnabled(true);
} else {
btnIniciarReparacin.setEnabled(false);
}
can be shortened to:
int row = table.getSelectedRow();
btnIniciarReparacin.setEnabled(table.isRowSelected(row));
e.g. something like:
table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent event) {
int row = table.getSelectedRow();
btnIniciarReparacin.setEnabled(table.isRowSelected(row));
}
});
For example, if the button deletes a row:
import java.awt.BorderLayout;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.DefaultTableModel;
#SuppressWarnings("serial")
public class Test01 extends JPanel {
private static final String[] COLUMNS = {"One", "Two", "Three", "Four"};
private DefaultTableModel tableModel = new DefaultTableModel(COLUMNS, 0);
private JTable table = new JTable(tableModel);
private JButton deleteRowButton = new JButton("Delete Row");
public Test01() {
int tableRows = 20;
for (int i = 0; i < tableRows; i++) {
Integer[] row = new Integer[COLUMNS.length];
for (int j = 0; j < row.length; j++) {
row[j] = (int) (100 * Math.random());
}
tableModel.addRow(row);
}
table.getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
#Override
public void valueChanged(ListSelectionEvent e) {
int row = table.getSelectedRow();
deleteRowButton.setEnabled(table.isRowSelected(row));
}
});
deleteRowButton.addActionListener(e -> {
int row = table.getSelectedRow();
tableModel.removeRow(row);
});
deleteRowButton.setEnabled(false);
JPanel bottomPanel = new JPanel();
bottomPanel.add(deleteRowButton);
setLayout(new BorderLayout());
add(new JScrollPane(table));
add(bottomPanel, BorderLayout.PAGE_END);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
private static void createAndShowGui() {
Test01 mainPanel = new Test01();
JFrame frame = new JFrame("Test01");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
}

how to insert Image a row in DefaultTableModel?

public static void table2() {
Object num[] = new Object[1];
for (int q = 0; q < MyDto.userList.size(); q++) {
try {
//ImageIcon i2 = new ImageIcon(new ImageIcon(MyDto.userList.get(q).getMyImg()).getImage()
// .getScaledInstance(150, 120, Image.SCALE_SMOOTH));
ImageIcon i2 = new ImageIcon("/Users/junseok/Desktop/1.png");
JLabel lbImage1 = new JLabel(i2);
lbImage1.setIcon(i2);
num[0] = lbImage1;
model2.addRow(num);
System.out.println(num[0].toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}
why doesnt show image? why write only toString()??

why write only toString()??
The default renderer just invokes the toString() method of the object in the TableModel.
why doesnt show image?
You need to add an Icon to the TableModel (not a JLabel). Then you need to tell the table the Icon is stored in the column so the table can choose the appropriate renderer to paint the Icon.
This is done by overriding the getColumnClass(...) method of the TableModel:
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
public class TableIcon extends JPanel
{
public TableIcon()
{
Icon aboutIcon = new ImageIcon("about16.gif");
Icon addIcon = new ImageIcon("add16.gif");
Icon copyIcon = new ImageIcon("copy16.gif");
String[] columnNames = {"Picture", "Description"};
Object[][] data =
{
{aboutIcon, "About"},
{addIcon, "Add"},
{copyIcon, "Copy"},
};
DefaultTableModel model = new DefaultTableModel(data, columnNames)
{
// Returning the Class of each column will allow different
// renderers to be used based on Class
#Override
public Class getColumnClass(int column)
{
return getValueAt(0, column).getClass();
}
};
JTable table = new JTable( model );
table.setPreferredScrollableViewportSize(table.getPreferredSize());
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("Table Icon");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TableIcon());
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}

Removing Items from an ArrayList through a JTable

I have a JTable that includes items from an ArrayList, however whenever I try to remove the contents of deleted row from the ArrayList I get an IndexOutOfBoundsException depending on the amount of rows I wanted to delete and their location. How would I go about solving this issue?
Runnable Code: http://pastebin.com/Nnrnxzdg
remove.addActionListener( e -> {
int k = 0;
int[] rows = table.getSelectedRows();
TableModel tm= table.getModel();
while(rows.length>0)
{
while(k<rows.length)
{
al.remove(table.getSelectedRow() + k);
k++;
}
((DefaultTableModel)tm).removeRow(table.convertRowIndexToModel(rows[0]));
rows = table.getSelectedRows();
}
table.clearSelection();
});

Basically, the moment you remove a row, all the indices change. So what you need to do, is make a copy of all the selected rows, but NOT the index, but the actual row value...
JTable table = getTable();
if (table.getSelectedRowCount() > 0) {
List<Vector> selectedRows = new ArrayList<>(25);
DefaultTableModel model = getModel();
Vector rowData = model.getDataVector();
for (int row : table.getSelectedRows()) {
int modelRow = table.convertRowIndexToModel(row);
Vector rowValue = (Vector) rowData.get(modelRow);
selectedRows.add(rowValue);
}
Now with this, you can calculate the indexOf any given object with the model and remove it...
for (Vector rowValue : selectedRows) {
int rowIndex = rowData.indexOf(rowValue);
model.removeRow(rowIndex);
}
}
without caring what the index of the value was.

The indexes change if you remove the rows from the start of the model.
One solution is to remove one row at a time, ten all the selected indexes are reset so you are always removing the proper index:
Here is an example showing how you might do this for a JList and a JTable:
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.*;
import javax.swing.table.*;
public class ItemDeletion extends JPanel
{
private JList<String> list;
private JTable table;
public ItemDeletion()
{
setLayout( new BorderLayout(5, 5) );
String[] items =
{
"One",
"Two",
"Three",
"Four",
"Five",
"Six",
"Seven",
"Eight",
"Nine",
"Ten"
};
// Add the list
DefaultListModel<String> listModel = new DefaultListModel<String>();
for (String item: items)
listModel.addElement( item );
list = new JList<String>( listModel );
JButton listDelete = new JButton( "Delete From List" );
listDelete.addActionListener( new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
DefaultListModel model = (DefaultListModel)list.getModel();
int row = list.getSelectedIndex();
while (row != -1)
{
model.removeElementAt( row );
row = list.getSelectedIndex();
}
}
});
JPanel listPanel = new JPanel( new BorderLayout(5, 5) );
listPanel.add(new JScrollPane( list ), BorderLayout.CENTER);
listPanel.add(listDelete, BorderLayout.PAGE_END);
// Add the table
DefaultTableModel tableModel = new DefaultTableModel(0, 1);
List<String> tableItems = Arrays.asList( items );
Collections.shuffle( tableItems );
for (String item: tableItems)
{
System.out.println( item );
tableModel.addRow( new String[]{item} );
}
table = new JTable( tableModel );
table.setAutoCreateRowSorter(true);
((DefaultRowSorter)table.getRowSorter()).toggleSortOrder(0);
JButton tableDelete = new JButton( "Delete From Table" );
tableDelete.addActionListener( new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
DefaultTableModel model = (DefaultTableModel)table.getModel();
int row = table.getSelectedRow();
while (row != -1)
{
int modelRow = table.convertRowIndexToModel( row );
model.removeRow( modelRow );
row = table.getSelectedRow();
}
}
});
JPanel tablePanel = new JPanel( new BorderLayout(5, 5) );
tablePanel.add(new JScrollPane( table ), BorderLayout.CENTER);
tablePanel.add(tableDelete, BorderLayout.PAGE_END);
add(listPanel, BorderLayout.LINE_START);
add(tablePanel, BorderLayout.LINE_END);
}
private static void createAndShowGUI()
{
JFrame frame = new JFrame("Multiple Item Deletion");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new ItemDeletion(), BorderLayout.NORTH);
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
}

Removing combobox as the cell editor of a jtable cell

I have made a combobox as cell editor of a column. I want when i create a new row the cell in that column should not have the combobox as the cell editor and should retain JTextField as the cell editor. Here is what i have done so far.
addRow(mainWindow.salesTable);
final TableColumn items = mainWindow.salesTable.getColumnModel().getColumn(0);
final JTextField tfield = new JTextField();
DefaultCellEditor editorqty = new DefaultCellEditor(tfield);
items.setCellEditor(editorqty);
private static void addRow(JTable table) {
DefaultTableModel model = (DefaultTableModel) table.getModel();
Vector row = new Vector();
row.add("");
row.add("");
row.add("");
row.add("");
row.add("");
row.add("");
row.add("");
row.add("");
model.addRow(row);
}

Overriding the getCellEditor(...) method of JTble is one approach:
import java.awt.*;
import java.util.List;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
public class TableComboBoxByRow extends JPanel
{
List<String[]> editorData = new ArrayList<String[]>(3);
public TableComboBoxByRow()
{
setLayout( new BorderLayout() );
// Create the editorData to be used for each row
editorData.add( new String[]{ "Red", "Blue", "Green" } );
editorData.add( new String[]{ "Circle", "Square", "Triangle" } );
editorData.add( new String[]{ "Apple", "Orange", "Banana" } );
// Create the table with default data
Object[][] data =
{
{"Color", "Red"},
{"Shape", "Square"},
{"Fruit", "Banana"},
{"Plain", "Text"}
};
String[] columnNames = {"Type","Value"};
DefaultTableModel model = new DefaultTableModel(data, columnNames);
JTable table = new JTable(model)
{
// Determine editor to be used by row
public TableCellEditor getCellEditor(int row, int column)
{
int modelColumn = convertColumnIndexToModel( column );
if (modelColumn == 1 && row < 3)
{
JComboBox<String> comboBox1 = new JComboBox<String>( editorData.get(row));
return new DefaultCellEditor( comboBox1 );
}
else
return super.getCellEditor(row, column);
}
};
JScrollPane scrollPane = new JScrollPane( table );
add( scrollPane );
}
private static void createAndShowUI()
{
JFrame frame = new JFrame("Table Combo Box by Row");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new TableComboBoxByRow() );
frame.setSize(200, 200);
frame.setLocationByPlatform( true );
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}

Setting the Box's size

This may seem like a stupid question, but I would like to change the size of a 'box' in my jFrame. I will include the code and a picture.
Here is the JTableResultSet class:
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.TableColumn;
public class JTableResultSet {
public static void main(String[] args) {
Vector columnNames = new Vector();
Vector data = new Vector();
JPanel panel = new JPanel(); //
try {
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/exper482_social", "admin", "testing");
String sql = "Select username, forename, lastname, password from social_users";
Statement statement = con.createStatement();
ResultSet resultSet = statement.executeQuery(sql);
ResultSetMetaData metaData = resultSet.getMetaData();
int columns = metaData.getColumnCount();
for (int i = 1; i <= columns; i++) {
columnNames.addElement(metaData.getColumnName(i));
}
while (resultSet.next()) {
Vector row = new Vector(columns);
for (int i = 1; i <= columns; i++) {
row.addElement(resultSet.getObject(i));
}
data.addElement(row);
}
resultSet.close();
statement.close();
} catch (Exception e) {
System.out.println(e);
}
JTable table = new JTable(data, columnNames);
TableColumn column;
for (int i = 0; i < table.getColumnCount(); i++) {
column = table.getColumnModel().getColumn(i);
column.setMaxWidth(250);//250
}
JScrollPane scrollPane = new JScrollPane(table);
panel.add(scrollPane);
JFrame frame = new JFrame();
frame.add(panel);//adding panel to the frame
frame.setSize(600, 400); //setting frame size 600 400
frame.setVisible(true); //setting visibility true
}
}
And here is the photo:
http://i.stack.imgur.com/Wblfx.png
Can someone please tell me what i can do to make the box bigger? Thanks.

You can use BorderLayout which will make the JScrollPane occupy the full area of the JPanel
JPanel panel = new JPanel(new BorderLayout());
The default JPanel layout, FlowLayout, uses a component's preferred size which will not expand to fill the window.
Read Guide to Layout Managers