Develop Reference

How to take value of JComboBox value that is inside JTable?

I have tried this part of code to get values from a JComboBox that is inside of a JTable, but it doesn't work!
I want to get the value of selected cell in order to insert into DB.
package fx;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
public class ComboInTable extends JFrame {
private static JFrame jFrame;
public ComboInTable() throws HeadlessException {
jFrame=this;
JTable table=new JTable();
DefaultTableModel model= (DefaultTableModel) table.getModel();
model.addColumn("A",new Object[]{"item1"});
model.addColumn("B",new Object[]{"item2"});
JScrollPane scrollPane=new JScrollPane(table);
String[] value1=new String[]{"1","2","3"};
String[] value2=new String[]{"a","b","c"};
TableColumn col0=table.getColumnModel().getColumn(0);
TableColumn col1=table.getColumnModel().getColumn(1);
col0.setCellEditor(new MyComboBoxEditor(value1));
col0.setCellRenderer(new MyComboBoxRenderer(value1));
col1.setCellEditor(new MyComboBoxEditor(value2));
col1.setCellRenderer(new MyComboBoxRenderer(value2));
JComboBox comboBox=new JComboBox(value1);
comboBox.addItemListener(new ItemListener() {
#Override
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == ItemEvent.SELECTED)
{
System.out.println(e.getItem());
}
}
});
jFrame.setLayout(new FlowLayout());
jFrame.add(scrollPane);
jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jFrame.setSize(400, 400);
jFrame.setVisible(true);
}
public static void main(String[] args) {
ComboInTable comboInTable=new ComboInTable();
}
}
I have MyComboBoxEditor and MyComboBoxRenderer classes.
package fx;
import javax.swing.*;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;
public class MyComboBoxRenderer extends JComboBox implements TableCellRenderer {
public MyComboBoxRenderer(String[] items) {
super( items);
}
#Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
if(isSelected){
setForeground(table.getSelectionForeground());
super.setBackground(table.getSelectionBackground());
}
else {
setForeground(table.getForeground());
setBackground(table.getBackground());
}
setSelectedItem(value);
return this;
}
}
package fx;
import javax.swing.*;
import javax.swing.table.TableCellEditor;
public class MyComboBoxEditor extends DefaultCellEditor {
public MyComboBoxEditor(String[] items) {
super(new JComboBox(items));
}
}

I have tried this part of code to get values from a JComboBox that is inside of a JTable,
You don't get the value from the combo box.
You get the value from the JTable using the getValueAt(...) method.
I also have no idea why you are creating a custom renderer and editor. Just use the default renderer/editor provided by the table.
Start by reading the section from the Swing tutorial on How to Use Tables. You will find an example that shows how to use a combo box as an editor.

Issue with clickable buttons in JTable column

I am trying to create a JTable which has clickable buttons in one column. I have been following a tutorial found here: https://www.youtube.com/watch?v=3LiSHPqbuic. Essentially, when you click one of the buttons a message box pops up. My code almost works but I have to double click the buttons rather than single click. I have been playing around with it for quite sometime and not made much progress. Can anyone see where I'm going wrong?
package buttoncolumn;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.TableCellRenderer;
public class ButtonColumn extends JFrame {
public ButtonColumn() {
super("Button Column Example");
//Data for table
Object[][] data=
{
{"1","Man Utd",new Integer(2013),"21"},
{"2","Man City",new Integer(2014),"3"},
{"3","Chelsea",new Integer(2015),"7"},
{"4","Arsenal",new Integer(1999),"10"},
{"5","Liverpool",new Integer(1990),"19"},
{"6","Everton",new Integer(1974),"1"},
};
//Column header
String columnHeaders[]={"Position","Team","Last Year Won","Trophies"};
//Create table object
JTable table=new JTable(data,columnHeaders);
//Set custom renderer to teams column
table.getColumnModel().getColumn(1).setCellRenderer(new ButtonRenderer());;
//Set custom editor to team column
table.getColumnModel().getColumn(1).setCellEditor(new ButtonEditor(new JTextField()));
//Scroll pane
JScrollPane pane=new JScrollPane(table);
getContentPane().add(pane);
setSize(450,100);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] args) {
ButtonColumn bc = new ButtonColumn();
bc.setVisible(true);
}
}
//Button renderer class
class ButtonRenderer extends JButton implements TableCellRenderer
{
//Constructir
public ButtonRenderer(){
setOpaque(true);
}
#Override
public Component getTableCellRendererComponent(JTable table, Object obj,
boolean selected, boolean focused, int row, int col) {
setText((obj==null) ? "":obj.toString());
return this;
}
}
//Button editor class
class ButtonEditor extends DefaultCellEditor
{
protected JButton btn;
private String lbl;
private Boolean clicked;
public ButtonEditor(JTextField txt){
super(txt);
btn=new JButton();
btn.setOpaque(true);
//When button is clicked
btn.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
fireEditingStopped();
}
});
}
//Overide a couple of methods
public Component getTableCellEditorComponent(JTable table, Object obj,
boolean selected, int row, int col) {
//Set button text
lbl=(obj==null) ? "":obj.toString();
btn.setText(lbl);
clicked=true;
return btn;
}
//If button cell value changes (clicked)
#Override
public Object getCellEditorValue(){
if(clicked)
{
JOptionPane.showMessageDialog(btn, lbl+" Clicked");
}
clicked = false;
return new String(lbl);
}
#Override
public boolean stopCellEditing(){
clicked=false;
return super.stopCellEditing();
}
#Override
protected void fireEditingStopped(){
super.fireEditingStopped();
}
}

Make sure you consult the documentation for more information about the classes you are creating.
Have a look at the JavaDocs for DefaultCellEditor and Using Other Editors for more details.
Essentially, you need to modify the isCellEditable method of the DefaultCellEditor
class ButtonEditor extends DefaultCellEditor {
//...
#Override
public boolean isCellEditable(EventObject anEvent) {
return anEvent instanceof MouseEvent && ((MouseEvent) anEvent).getClickCount() == 1 && SwingUtilities.isLeftMouseButton((MouseEvent) anEvent);
}
}
Or, if you really want it simple, just use setClickCountToStart
class ButtonEditor extends DefaultCellEditor {
//...
public ButtonEditor(JTextField txt) {
super(txt);
setClickCountToStart(1);
//...
}
}

JComboBox how to show the right end of the item?

I have the following Java code:
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JComboBox;
import javax.swing.JFrame;
public class EnumsRightVisible {
public void show() {
JFrame frame = new JFrame("Combo box");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String[] items = {"aaaaaaaaa__________zzzzzzzzz",
"aaaaaaaaa__________zzzzzzzzz",
"aaaaaaaaa__________zzzzzzzzz"};
JComboBox combo = new JComboBox(items);
combo.setPreferredSize(new Dimension(100,20));
frame.add(combo, BorderLayout.CENTER);
frame.setLocation(600, 100);
frame.pack();
frame.setVisible(true);
}
public static void main(String args[]) {
EnumsRightVisible enumsRightVisible = new EnumsRightVisible();
enumsRightVisible.show();
}
}
Running it you can see that the visible text is left oriented.
Please note that this code does not solve my problem (it aligns the text to the right, but only when the combo box is expanded):
((JLabel)comboBox.getRenderer()).setHorizontalAlignment(JLabel.RIGHT);
How can I display the right end of the text in the same window (...__zzzzzz)?
Thanks in advance!

Use a custom renderer that uses FontMetrics to measure the String's width and does the ellipsis (...) manually. More info here: http://docs.oracle.com/javase/tutorial/uiswing/components/combobox.html#renderer

Method 1
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class ComboBoxDemo extends JFrame {
public ComboBoxDemo() {
JComboBox comboBox = new JComboBox();
((JLabel)comboBox.getRenderer()).setHorizontalAlignment(JLabel.RIGHT);
comboBox.addItem("Apple");
comboBox.addItem("Orange");
comboBox.addItem("Mango");
getContentPane().add(comboBox, "North");
setSize(200, 100);
this.setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new ComboBoxDemo().setVisible(true);
}
}
Method 2 (Oviously, First is better)
import java.awt.Component;
import java.awt.ComponentOrientation;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.ListCellRenderer;
public class ComboBoxDemo extends JFrame {
public ComboBoxDemo() {
JComboBox comboBox = new JComboBox();
setListCellRendererOf(comboBox);
comboBox.addItem("Apple");
comboBox.addItem("Orange");
comboBox.addItem("Mango");
getContentPane().add(comboBox, "North");
setSize(200, 100);
this.setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private void setListCellRendererOf(JComboBox comboBox) {
comboBox.setRenderer(new ListCellRenderer() {
#Override
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
Component component = new DefaultListCellRenderer()
.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
component.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
return component;
}
});
}
public static void main(String[] args) {
new ComboBoxDemo().setVisible(true);
}
}

How to display the color selected in my combo box

So I'm attempting to make a pretty window displaying the color selected from the combo box. But I got the window and combo box made, for some reason my color isn't displayed. Can anyone help me?
Also from what I can tell, my combo box is at the top of my window. I would like to have it shown below the color.
import java.awt.*;
import java.awt.event.*;
import javax.swing.JFrame;
class Colors extends JFrame implements ItemListener
{
Choice chooseColor = new Choice();
Label lblQts = new Label("Choose color you like : ");
public Colors(String title)
{
super(title);
setLayout(new FlowLayout());
chooseColor.addItem("red");
chooseColor.addItem("green");
chooseColor.addItem("blue");
add(lblQts);
add(chooseColor);
chooseColor.addItemListener(this);
}
public void itemStateChanged(ItemEvent e)
{
String c;
Color color;
c = chooseColor.getSelectedItem();
color=Color.getColor(c);
setBackground(color);
}
}
public static void main(String[] args)
{
Colors objColor = new Colors("Color Chooser");
objColor.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
objColor.setSize(400,400);
objColor.setVisible(true);
}

Let's assume for a moment that you really should be using the Swing API and not the AWT API (and seen as you're only just learning I think it's a decent assumption to make).
You can do the following...
Basically. I have JComboBox with a custom ListCellRenderer and ActionListener.
The ListCellRenderer renders the items in a fashion I want and the ActionListener listeners for changes to the combobox.
When a new item is selected, it will change the background of the combo box based on the selected item.
The concepts demonstrated here are crucial to understanding Swing (and Java in general)
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ComboBoxEditor;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestComboBox08 {
public static void main(String[] args) {
new TestComboBox08();
}
public TestComboBox08() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
final JComboBox cb = new JComboBox();
cb.addItem(new SelectableColor("Red", Color.RED));
cb.addItem(new SelectableColor("Green", Color.GREEN));
cb.addItem(new SelectableColor("Blue", Color.BLUE));
cb.setRenderer(new ColorCellRenderer());
add(cb);
cb.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
Object value = cb.getSelectedItem();
if (value instanceof SelectableColor) {
cb.setBackground(((SelectableColor)value).getColor());
} else {
cb.setBackground(null);
}
}
});
cb.setSelectedItem(null);
}
}
public class SelectableColor {
private String name;
private Color color;
public SelectableColor(String name, Color color) {
this.name = name;
this.color = color;
}
public String getName() {
return name;
}
public Color getColor() {
return color;
}
}
public class ColorCellRenderer extends DefaultListCellRenderer {
#Override
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
if (value instanceof SelectableColor) {
SelectableColor sc = (SelectableColor) value;
if (!isSelected) {
setBackground(sc.getColor());
setOpaque(true);
}
setText(sc.getName());
}
return this;
}
}
}
You really should familiarise yourself with Creating A UI with Swing. If that is going over your head, start with Trails covering the basics

You need to set contentPane's background, not JFrame background.
Then, you can't use Color.getColor to retrieve your color object for this case. See this
This is the working code:
import java.awt.Choice;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Label;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.lang.reflect.Field;
import javax.swing.JFrame;
public class Colors extends JFrame implements ItemListener
{
Choice chooseColor = new Choice();
Label lblQts = new Label("Choose color you like : ");
public Colors (String title) {
super(title);
setLayout(new FlowLayout());
chooseColor.addItem("red");
chooseColor.addItem("green");
chooseColor.addItem("blue");
add(lblQts);
add(chooseColor);
chooseColor.addItemListener(this);
}
public void itemStateChanged(ItemEvent e) {
String c;
Color color;
c = chooseColor.getSelectedItem();
try {
Field field = Class.forName("java.awt.Color").getField(c);
color = (Color)field.get(null);
} catch (Exception ex) {
color = null; // Not defined
}
getContentPane().setBackground(color);
}
public static void main(String[] args) {
Colors objColor = new Colors ("Color Chooser");
objColor.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
objColor.setSize(400, 400);
objColor.setVisible(true);
}
}

How to get the selected RadioButton from JTable

i'm workin on programe and i need to get the selected radio buttom from a Jtable
I found an exemple that i'm workin on
there is to class
the 1st :
import java.awt.Component;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import javax.swing.DefaultCellEditor;
import javax.swing.JCheckBox;
import javax.swing.JRadioButton;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
class RadioButtonRenderer implements TableCellRenderer {
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
if (value == null)
return null;
return (Component) value;
}
}
class RadioButtonEditor extends DefaultCellEditor implements ItemListener {
/**
*
*/
private static final long serialVersionUID = 1L;
private JRadioButton button;
public RadioButtonEditor(JCheckBox checkBox) {
super(checkBox);
}
public Component getTableCellEditorComponent(JTable table, Object value,
boolean isSelected, int row, int column) {
if (value == null)
return null;
button = (JRadioButton) value;
button.addItemListener(this);
return (Component) value;
}
public Object getCellEditorValue() {
button.removeItemListener(this);
return button;
}
public void itemStateChanged(ItemEvent e) {
super.fireEditingStopped();
}
}
and the 2nd class is :
package TP2;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import javax.swing.ButtonGroup;
import javax.swing.ButtonModel;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JToggleButton;
import javax.swing.event.TableModelEvent;
import javax.swing.table.DefaultTableModel;
import net.miginfocom.swing.MigLayout;
public class tablesDesEtudiants extends JFrame {
public tablesDesEtudiants(Object[][] objt) {
super("List des etudiants");
// UIDefaults ui = UIManager.getLookAndFeel().getDefaults();
// UIManager.put("RadioButton.focus", ui.getColor("control"));
DefaultTableModel dm = new DefaultTableModel();
dm.setDataVector(objt , new Object[] {"Nom","Prénom","Année","Succs","Type","Select"});
JTable table = new JTable(dm) {
public void tableChanged(TableModelEvent e) {
super.tableChanged(e);
repaint();
}
};
final ButtonGroup group1 = new ButtonGroup();
for(int i =0 ; i<objt.length;i++){
if(objt[i][1]!=null)
group1.add((JRadioButton) dm.getValueAt(i, 5));
}
// System.out.println(objt.length);
table.getColumn("Select").setCellRenderer(new RadioButtonRenderer());
table.getColumn("Select").setCellRenderer(new RadioButtonRenderer());
table.getColumn("Select").setCellRenderer(new RadioButtonRenderer());
table.getColumn("Select").setCellRenderer(new RadioButtonRenderer());
table.getColumn("Select").setCellRenderer(new RadioButtonRenderer());
table.getColumn("Select").setCellEditor(new RadioButtonEditor(new JCheckBox()));
JScrollPane scroll = new JScrollPane(table);
JButton bView = new JButton("View");
bView.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ButtonModel choix = group1.getSelection();
if (choix != null) {
System.out.println( choix.getActionCommand());
}
else System.out.println("nullll");
}
});
JPanel pp =new JPanel();
MigLayout layout = new MigLayout(
"", // Layout Constraints
"[][]20[]", // Column constraints
"[]20[]"); // Row constraint
pp.setLayout(layout);
pp.add(scroll,"cell 1 2");
pp.add(bView,"cell 2 3");
getContentPane().add(pp);
setSize(600, 400);
setVisible(true);
}
/* public static void main(String[] args) {
JRadioButtonTableExample frame = new JRadioButtonTableExample();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}*/
}
in the 2nd class i'm trying to add all the radio button on ButtonGroup
like this :
final ButtonGroup group1 = new ButtonGroup();
for(int i =0 ; i<objt.length;i++){
if(objt[i][1]!=null)
group1.add((JRadioButton) dm.getValueAt(i, 5));
}
and my problem is that i can't get selected RadioButton :
ButtonModel choix = group1.getSelection();
if (choix != null) {
System.out.println( choix.getActionCommand());
}
else System.out.println("nullll");
}
i alwayse get nullll
any help plz !!

Read my answer to this question. You shouldn't store components in a table. Store booleans. You should then configure a renderer to display the boolean as a radio button, and an editor to change the value of the checked cell as well as the value of the previously checked one. And understand that the same instance of renderer is used to render/edit all the cells of the same class.

I think that not easy job, TableCellEditor for JRadioButtons in the ButtonGroup
use JCheckBox if is possible
use JComboBox as TableCellEditor instead of JRadioButtons in the ButtonGroup if is possible, for TableCellRenderer you can use JRadioButtons in the ButtonGroup