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reading the value of jtable selected row

I am working with java RMI and swing and I have read the values from database but i am unable to read the value of selected row in this code. What i want to JTable to show all databases and it is showing all the available databases in server but i am unable to read the selected row value in this
package schoolclient;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.table.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.*;
import schoolserver.SchoolInterface;
public class DatabaseList {
JFrame jFrame = null;
JPanel jPanel = null;
JList jList = null;
JTable jTable = null;
String data = null;
schoolserver.SchoolInterface schoolInt = null;
public DatabaseList(SchoolInterface sii) {
schoolInt = sii;
jFrame = new JFrame();
jTable = new JTable(){
public boolean isCellEditable(int row, int column) {
return false;
}
};
jTable.setModel(createTable());
jTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
jTable.addMouseListener(new MouseAdapter() {
public void MouseClicked(MouseEvent e) {
if(SwingUtilities.isLeftMouseButton(e) && (e.getClickCount() == 2)) {
new createListSelection();
}
}
});
JScrollPane scrollPane = new JScrollPane(jTable);
jFrame.add(scrollPane);
jFrame.setSize(200, 200);
jFrame.setVisible(true);
}
private DefaultTableModel createTable() {
DefaultTableModel dtm = new DefaultTableModel();
dtm.addColumn("Databases", createArray());
return dtm;
}
private class createListSelection implements ListSelectionListener {
#Override
public void valueChanged(ListSelectionEvent e) {
if(!e.getValueIsAdjusting()) {
ListSelectionModel lsm = jTable.getSelectionModel();
data = (String) jTable.getValueAt(jTable.getSelectedRow(), 0);
System.out.println(data);
}
}
}
Object[] createArray() {
ArrayList<Object> al = null;
Object[] x = null;
try {
al = schoolInt.availableDatabases();
x = new Object[al.size()];
int i = 0;
for(Object o : schoolInt.availableDatabases())
x[i++] = o;
}
catch(Exception e) {
JOptionPane.showMessageDialog(null, "no connection to database or "
+ "remote server availabe", "Server Information", JOptionPane.OK_OPTION);
}
return x;
}
}

You look to be over-complicating things. Don't re-add listeners within a listener, but rather simply add one listener, a MouseListener to the JTable, and add it once. Within it check for double clicks (presses) and respond. Something like:
jTable.addMouseListener(new MouseAdapter() {
#Override
public void mousePressed(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1 && e.getClickCount() == 2) {
data = (String) jTable.getValueAt(jTable.getSelectedRow(), 0);
System.out.println(data);
}
}
});
Other problems, your method within your MouseAdapter will never be called, ever:
jTable.addMouseListener(new MouseAdapter() {
public void MouseClicked(MouseEvent e) {
// ....
}
});
Your capitalization is wrong, and since MouseAdapter/MouseListener does not have a MouseClicked method (it is mouseClicked) this method is never called. Always place an #Override annotation above any method that you think might be an override, and let the compiler warn you if it is not so. Had you done this, you'd get a prompt warning from the compiler.
Regarding your comment
You never add a selection listener to the JTable. Again the method within the MouseAdapter is never called since it is not capitalized correctly
Even if it did get called, what use is there repeatedly adding a ListSelectionListener?
If your goal is to only respond to double-clicks, a ListSelectionListener is not what you want. Only a MouseListener would work in this situation.
Do read the appropriate tutorials as they explain all of this and well. Please check out the links to be found within the Swing Info tag.

InputVerifier don't display each component icon(lable)

I have a form that set a input verifier to it.
I want when a user type a correct value for a text field and want to go to other text field, a check icon should be display besides of text field.
But now in my code, when user type a correct value on first text field an go to other, Two icons displayed together!
public class UserDialog extends JDialog {
JButton cancelBtn, okBtn;
JTextField fNameTf, lNameTf;
JRadioButton maleRb, femaleRb;
ButtonGroup group;
JLabel fNameLbl, fNamePicLbl, lNameLbl, lNamePicLbl, genderLbl, tempBtn, temp3;
public UserDialog() {
add(createForm(), BorderLayout.CENTER);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setLocation(400, 100);
pack();
setVisible(true);
}
public JPanel createForm() {
JPanel panel = new JPanel();
ImageIcon image = new ImageIcon("Check.png");
okBtn = new JButton("Ok");
cancelBtn = new JButton("Cancel");
tempBtn = new JLabel();
fNameLbl = new JLabel("First Name");
fNamePicLbl = new JLabel(image);
fNamePicLbl.setVisible(false);
lNameLbl = new JLabel("Last Name");
lNamePicLbl = new JLabel(image);
lNamePicLbl.setVisible(false);
genderLbl = new JLabel("Gender");
maleRb = new JRadioButton("Male");
femaleRb = new JRadioButton("Female");
temp3 = new JLabel();
group = new ButtonGroup();
group.add(maleRb);
group.add(femaleRb);
fNameTf = new JTextField(10);
fNameTf.setName("FnTF");
fNameTf.setInputVerifier(new MyVerifier(new JComponent[]{maleRb, femaleRb, okBtn}));
lNameTf = new JTextField(10);
lNameTf.setName("LnTF");
lNameTf.setInputVerifier(new MyVerifier(new JComponent[]{maleRb, femaleRb, okBtn}));
panel.add(fNameLbl);
panel.add(fNameTf);
panel.add(fNamePicLbl);
panel.add(lNameLbl);
panel.add(lNameTf);
panel.add(lNamePicLbl);
panel.add(genderLbl);
JPanel radioPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
radioPanel.add(maleRb);
radioPanel.add(femaleRb);
panel.add(radioPanel);
panel.add(temp3);
panel.add(okBtn);
panel.add(cancelBtn);
panel.add(tempBtn);
panel.setLayout(new SpringLayout());
SpringUtilities.makeCompactGrid(panel, 4, 3, 50, 10, 80, 60);
return panel;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new UserDialog();
}
});
}
public class MyVerifier extends InputVerifier {
private JComponent[] component;
public MyVerifier(JComponent[] components) {
component = components;
}
#Override
public boolean verify(JComponent input) {
String name = input.getName();
if (name.equals("FnTF")) {
String text = ((JTextField) input).getText().trim();
if (text.matches(".*\\d.*") || text.length() == 0) {
//disable dependent components
for (JComponent r : component) {
r.setEnabled(false);
}
return false;
}
} else if (name.equals("LnTF")) {
String text = ((JTextField) input).getText();
if (text.matches(".*\\d.*") || text.length() == 0) {
//disable dependent components
for (JComponent r : component) {
r.setEnabled(false);
}
return false;
}
}
//enable dependent components
for (JComponent r : component) {
r.setEnabled(true);
}
fNamePicLbl.setVisible(true);
lNamePicLbl.setVisible(true);
return true;
}
}
}
}
Updated
public class MyVerifier extends InputVerifier {
private JComponent[] component;
public MyVerifier(JComponent[] components) {
component = components;
}
#Override
public boolean verify(JComponent input) {
String name = input.getName();
if (name.equals("FnTF")) {
String text = ((JTextField) input).getText().trim();
if (text.matches(".*\\d.*") || text.length() == 0) {
return false;
}
} else if (name.equals("LnTF")) {
String text = ((JTextField) input).getText();
if (text.matches(".*\\d.*") || text.length() == 0) {
return false;
}
}
return true;
}
#Override
public boolean shouldYieldFocus(JComponent input) {
boolean isValidDate = verify(input);
if (isValidDate) {
for (JComponent r : component) {
r.setEnabled(true);
}
} else {
for (JComponent r : component) {
r.setEnabled(false);
}
}
return isValidDate;
}

But now in my code, when user type a correct value on first text field
an go to other, Two icons displayed together!
Because you did so: (Read the comments)
public boolean verify(JComponent input) {
String name = input.getName();
if (name.equals("FnTF")) {
// your code
}
} else if (name.equals("LnTF")) {
// your code
}
//enable dependent components
for (JComponent r : component) {
r.setEnabled(true);
}
/* And Now we are here */
fNamePicLbl.setVisible(true);
lNamePicLbl.setVisible(true);
// making visible two of them at once as soon as verify is called
// on any one of the components, verifier is registered
return true;
}
setVisible should be controlled by the if-else condition too. For your better understanding you need to do something like this:
if (text.matches(".*\\d.*") || text.length() == 0) {
// your code
}
else
{
fNamePicLbl.setVisible(true);
}
Second Issue:
fNameTf.setInputVerifier(new MyVerifier(new JComponent[]{maleRb, femaleRb, okBtn}));
lNameTf = new JTextField(10);
lNameTf.setName("LnTF");
lNameTf.setInputVerifier(new MyVerifier(new JComponent[]{maleRb, femaleRb, okBtn}));
The MyVerfier has the common code to verify both input field. But you are creating two instances of it with same instances of components. Create one and set it as the input verifier of the two field.
You might want to create two different InputVerifier class for the two Text Field. FnTFVerifier and LnTFVerifier. Then put your verification code that relates them e.g., enabling the radio buttons and showing the label with check.png. most of the if-else checking will go-away.
But I think, this should not really be the preferable way. As the two text field has the common functionality, one InputVerifier class and instance is sufficient. you would have to just encapsulate the input text field and related cehckLabel to one component, then register the InputVerifier instances to this component.
Third issue: you are misusing verify function:
The verify function is meant to be used for nothing but verify data: whether data is valid or not with user required condition. It should do nothing more. InputVerifier has another function boolean ShouldYieldFocus(Jcomponent): Before focus is transfered to another Swing component that requests it, the input verifier's shouldYieldFocus method is called, which decides whither the component under verification should lose focus or not. Focus is transferred only if this method returns true. You should however write the required state change of components inside this function.
public boolean shouldYieldFocus(JComponent input) {
boolean isDataValid = verify(input);
if(isDataValid); //do stuff
return isDataValid; // if verify is true(valid) return true;
}

Java Swing Combobox removeAllItems calling ItemStateChanged also?

My code is quite simple actually. I saw a simple and similar code was from this article.
At first, I have 1 combobox. I have a listener on it called itemStateChanged(). My purpose to add into this listener is that; "to execute some code when user click (select) an item from its dropbox".
Cmb_ItemCategory = new javax.swing.JComboBox();
Cmb_ItemCategory.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Loading..." }));
Cmb_ItemCategory.addItemListener(new java.awt.event.ItemListener() {
public void itemStateChanged(java.awt.event.ItemEvent evt) {
Cmb_ItemCategoryItemStateChanged(evt);
}
});
private void Cmb_ItemCategoryItemStateChanged(java.awt.event.ItemEvent evt) {
if(evt.getStateChange() == java.awt.event.ItemEvent.SELECTED){
System.err.println("Sombody click or change my model content");
}
}
Behind the code, I grab some data, and then calling a method of removeAllItems() .
And then I set a new Model (from new data) into it.
-- at another line of code ---
Cmb_ItemCategory.removeAllItems();
Cmb_ItemCategory.setModel(newModel);
I juz realized that my itemStateChanged() is called when i do the removeAllItem() method. called once.
So, How to make it only called once user Click (select) only AND not when removeAllItems() called?
it similar to this article. But it's not removingItems case. CMIIW.

Here check this code out, this works flawlessly, might be you doing something wrong where you calling removeAllItems() :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ComboState
{
private void createAndDisplayGUI()
{
JFrame frame = new JFrame("Combo State Testing : ");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
final JComboBox cbox = new JComboBox();
cbox.addItem("One");
cbox.addItem("Two");
cbox.addItem("Three");
cbox.addItem("Four");
cbox.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent ie)
{
if (ie.getStateChange() == ItemEvent.SELECTED)
{
System.out.println("Item Selected is : " + ie.getItem());
}
/*else
{
System.out.println("I am called for other reasons.");
}*/
}
});
/*
* Click me to remove JComboBox's items.
*/
JButton removeButton = new JButton("REMOVE");
removeButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
cbox.removeAllItems();
}
});
frame.add(cbox, BorderLayout.CENTER);
frame.add(removeButton, BorderLayout.PAGE_END);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new ComboState().createAndDisplayGUI();
}
});
}
}

As nIcE cOw already illustrated in his example, it should certainly work when you use a DefaultComboBoxModel (which is the case in his sample code, although it happens behind the screens).
I could explain the behavior you encounter for the non-DefaultComboBoxModel case, although your code snippet suggests you use one. Looking at the source code for JComboBox#removeAllItems there is a different code path since the removeAllElements method is not part of the MutableComboBoxModel interface
public void removeAllItems() {
checkMutableComboBoxModel();
MutableComboBoxModel<E> model = (MutableComboBoxModel<E>)dataModel;
int size = model.getSize();
if ( model instanceof DefaultComboBoxModel ) {
((DefaultComboBoxModel)model).removeAllElements();
}
else {
for ( int i = 0; i < size; ++i ) {
E element = model.getElementAt( 0 );
model.removeElement( element );
}
}
selectedItemReminder = null;
if (isEditable()) {
editor.setItem(null);
}
}
So with a non-DefaultComboBoxModel you are going to remove the items one by one. This means that at a certain point in time, you will remove the selected element. A possible implementation of your model might change the selected element at that point. If you look for example at the implementation in DefaultComboBoxModel (although this code will not be triggered) you can clearly see it changes the selection.
public void removeElementAt(int index) {
if ( getElementAt( index ) == selectedObject ) {
if ( index == 0 ) {
setSelectedItem( getSize() == 1 ? null : getElementAt( index + 1 ) );
}
else {
setSelectedItem( getElementAt( index - 1 ) );
}
}
objects.removeElementAt(index);
fireIntervalRemoved(this, index, index);
}
Perhaps your model does something similar, which explains the event. Just for making this post complete, the code behind the DefaultComboBoxModel#removeAllElements where you can clearly see it sets the selection to null and does not select another object. Only weird thing in that code is that it does not fire a DESELECTED event first, although you know the selection has changed if you listen for the intervalRemoved event ... but that is not really relevant to your problem
public void removeAllElements() {
if ( objects.size() > 0 ) {
int firstIndex = 0;
int lastIndex = objects.size() - 1;
objects.removeAllElements();
selectedObject = null;
fireIntervalRemoved(this, firstIndex, lastIndex);
} else {
selectedObject = null;
}
}
So to conclude: I say the solution for your problem is located in your model, and not in the code you posted

One quick way to do is to have a bool set to true before you call removeAllItem() and back false after. Execute the code in your itemStateChanged() only if the bool variable is false.
Ideally you could override the removeAllItem() function.

not clear from whole discusion,
you have to remove all Listener(s) from JComboBox before removing all Items, after Items are removed you can add Listener(s) back,
still not sure if you want to add & remove Items dynamically, or you can set whatever value for another JComponent(s),
(against complicating simple things) did you see there remove,
.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class ComboBoxTwo extends JFrame implements ActionListener, ItemListener {
private static final long serialVersionUID = 1L;
private JComboBox mainComboBox;
private JComboBox subComboBox;
private Hashtable<Object, Object> subItems = new Hashtable<Object, Object>();
public ComboBoxTwo() {
String[] items = {"Select Item", "Color", "Shape", "Fruit"};
mainComboBox = new JComboBox(items);
mainComboBox.addActionListener(this);
mainComboBox.addItemListener(this);
//prevent action events from being fired when the up/down arrow keys are used
//mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
getContentPane().add(mainComboBox, BorderLayout.WEST);
subComboBox = new JComboBox();// Create sub combo box with multiple models
subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
subComboBox.addItemListener(this);
getContentPane().add(subComboBox, BorderLayout.EAST);
String[] subItems1 = {"Select Color", "Red", "Blue", "Green"};
subItems.put(items[1], subItems1);
String[] subItems2 = {"Select Shape", "Circle", "Square", "Triangle"};
subItems.put(items[2], subItems2);
String[] subItems3 = {"Select Fruit", "Apple", "Orange", "Banana"};
subItems.put(items[3], subItems3);
// mainComboBox.setSelectedIndex(1);
}
#Override
public void actionPerformed(ActionEvent e) {
String item = (String) mainComboBox.getSelectedItem();
Object o = subItems.get(item);
if (o == null) {
subComboBox.setModel(new DefaultComboBoxModel());
} else {
subComboBox.setModel(new DefaultComboBoxModel((String[]) o));
}
}
#Override
public void itemStateChanged(ItemEvent e) {
if (e.getStateChange() == ItemEvent.SELECTED) {
if (e.getSource() == mainComboBox) {
if (mainComboBox.getSelectedIndex() != 0) {
FirstDialog firstDialog = new FirstDialog(ComboBoxTwo.this,
mainComboBox.getSelectedItem().toString(), "Please wait, Searching for ..... ");
}
}
}
}
private class FirstDialog extends JDialog {
private static final long serialVersionUID = 1L;
FirstDialog(final Frame parent, String winTitle, String msgString) {
super(parent, winTitle);
setModalityType(Dialog.ModalityType.APPLICATION_MODAL);
JLabel myLabel = new JLabel(msgString);
JButton bNext = new JButton("Stop Processes");
add(myLabel, BorderLayout.CENTER);
add(bNext, BorderLayout.SOUTH);
bNext.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
setVisible(false);
}
});
javax.swing.Timer t = new javax.swing.Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
t.setRepeats(false);
t.start();
setLocationRelativeTo(parent);
setSize(new Dimension(400, 100));
setVisible(true);
}
}
public static void main(String[] args) {
JFrame frame = new ComboBoxTwo();
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}

The method removeAllItems does not call ItemStateChanged, but it call actionPerformed, you can check it by running this simple code:
public class Tuto {
public static void main(String[] args) {
//create the main frame
JFrame frame = new JFrame();
frame.setResizable(false);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setLayout(null);
frame.setLocation(new Point(10, 10));
frame.setPreferredSize(new Dimension(400, 300));
JComboBox<String> combo = new JComboBox();
combo.addItem("item 1");
combo.addItem("item 2");
combo.addItem("item 3");
combo.setBounds(50, 30, 300, 20);
combo.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
System.out.println(" action Performed ");
}
});
frame.add(combo);
JButton button = new JButton("Remove");
button.setBounds(50, 100, 100, 30);
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent ae) {
combo.removeAllItems();
}
});
frame.add(button);
frame.pack();
frame.setVisible(true);
}
}

Setting component focus in JOptionPane.showOptionDialog()

In order to have custom button captions in an input dialog, I created the following code:
String key = null;
JTextField txtKey = new JTextField();
int answerKey = JOptionPane.showOptionDialog(this, new Object[] {pleaseEnterTheKey, txtKey}, decryptionKey, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[] {okCaption, cancelCaption}, okCaption);
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}
How can I move the focus (cursor) to the text field as the dialog is displayed?
UPDATE
This does not work for me, I mean the textfield has no focus:
OS: Fedora - Gnome
public class Test {
public static void main(String[] args) {
String key = null;
JTextField txtKey = new JTextField();
txtKey.addAncestorListener(new RequestFocusListener());
int answerKey = JOptionPane.showOptionDialog(null, new Object[]{"Please enter the key:", txtKey}, "Title", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[]{"OKKK", "CANCELLLL"}, "OKKK");
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}
}
}

Dialog Focus shows how you can easily set the focus on any component in a modal dialog.

public static String getPassword(String title) {
JPanel panel = new JPanel();
final JPasswordField passwordField = new JPasswordField(10);
panel.add(new JLabel("Password"));
panel.add(passwordField);
JOptionPane pane = new JOptionPane(panel, JOptionPane.QUESTION_MESSAGE, JOptionPane.OK_CANCEL_OPTION) {
#Override
public void selectInitialValue() {
passwordField.requestFocusInWindow();
}
};
pane.createDialog(null, title).setVisible(true);
return passwordField.getPassword().length == 0 ? null : new String(passwordField.getPassword());
}

passing null as the last argument is the solution. At least it worked for me.
String key = null;
JTextField txtKey = new JTextField();
int answerKey = JOptionPane.showOptionDialog(this, new Object[] {pleaseEnterTheKey, txtKey}, decryptionKey, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[] {okCaption, cancelCaption}, null);
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}
But even this solution bring another problem:
Focused component and Default component are different. Default component or default button is the button which its onclick fires if you press ENTER KEY.The last argument define the default component which gets the focus too and passing null brings the problem of having no default component!
I solved it for my code this way but I guess it is not a best practice:
String key = null;
final JTextField txtKey = new JTextField();
txtKey.addKeyListener(new KeyAdapter() {
#Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();
if (keyCode == 10) { //enter key
Container parent = txtKey.getParent();
while (!(parent instanceof JOptionPane)) {
parent = parent.getParent();
}
JOptionPane pane = (JOptionPane) parent;
final JPanel pnlBottom = (JPanel) pane.getComponent(pane.getComponentCount() - 1);
for (int i = 0; i < pnlBottom.getComponents().length; i++) {
Component component = pnlBottom.getComponents()[i];
if (component instanceof JButton) {
final JButton okButton = ((JButton)component);
if (okButton.getText().equalsIgnoreCase(okCaption)) {
ActionListener[] actionListeners = okButton.getActionListeners();
if (actionListeners.length > 0) {
actionListeners[0].actionPerformed(null);
}
}
}
}
}
}
});

I had the same problem with the RequestFocusListener() not working on Linux, after following the discussion on http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5018574 I found that adding an invokeLater fixed it for now...
public class RequestFocusListener implements AncestorListener
{
public void ancestorAdded(final AncestorEvent e)
{
final AncestorListener al= this;
SwingUtilities.invokeLater(new Runnable(){
#Override
public void run() {
JComponent component = (JComponent)e.getComponent();
component.requestFocusInWindow();
component.removeAncestorListener( al );
}
});
}
public void ancestorMoved(AncestorEvent e) {}
public void ancestorRemoved(AncestorEvent e) {}
}

The trick is to (a) use an AncestorListener on the text component to request focus, and when the focus is lost again (given to the default button), ask for focus a second time using a FocusListener on the text component (but don't keep asking for focus after that):
final JPasswordField accessPassword = new JPasswordField();
accessPassword.addAncestorListener( new AncestorListener()
{
#Override
public void ancestorRemoved( final AncestorEvent event )
{
}
#Override
public void ancestorMoved( final AncestorEvent event )
{
}
#Override
public void ancestorAdded( final AncestorEvent event )
{
// Ask for focus (we'll lose it again)
accessPassword.requestFocusInWindow();
}
} );
accessPassword.addFocusListener( new FocusListener()
{
#Override
public void focusGained( final FocusEvent e )
{
}
#Override
public void focusLost( final FocusEvent e )
{
if( isFirstTime )
{
// When we lose focus, ask for it back but only once
accessPassword.requestFocusInWindow();
isFirstTime = false;
}
}
private boolean isFirstTime = true;
} );

Better way to do it: create the JOptionPane using the constructor, override selectInitialValue to set the focus, and then build the dialog using createDialog.
// Replace by the constructor you want
JOptionPane pane = new JOptionPane(panel, JOptionPane.PLAIN_MESSAGE, JOptionPane.OK_CANCEL_OPTION) {
#Override
public void selectInitialValue() {
textArea.requestFocusInWindow();
}
};
JDialog dialog = pane.createDialog(owner, title);
dialog.setVisible(true);

Try this
String key = null;
JTextField txtKey = new JTextField();
Object[] foo = {pleaseEnterTheKey, txtKey};
int answerKey = JOptionPane.showOptionDialog(this, foo, decryptionKey, JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, new Object[] {okCaption, cancelCaption}, foo[1]);
if (answerKey == JOptionPane.OK_OPTION && txtKey.getText() != null) {
key = txtKey.getText();
}

I found a solution !
Very primitive, but works.
Just jump to the field by java.awt.Robot using key "Tab".
I've created utils method calls "pressTab(..)"
For example:
GuiUtils.pressTab(1); <------------- // add this method before popup show
int result = JOptionPane.showConfirmDialog(this, inputs, "Text search window", JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION)
{
}
If you should press multiple times on "Tab" to get your Component you can use below method:
GUIUtils.pressTab(3);
Definition:
public static void pressTab(int amountOfClickes)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
try
{
Robot robot = new Robot();
int i = amountOfClickes;
while (i-- > 0)
{
robot.keyPress(KeyEvent.VK_TAB);
robot.delay(100);
robot.keyRelease(KeyEvent.VK_TAB);
}
}
catch (AWTException e)
{
System.out.println("Failed to use Robot, got exception: " + e.getMessage());
}
}
});
}
If your Component location is dynamic, you can run over the while loop without limitation, but add some focus listener on the component, to stop the loop once arrived to it.

How would I go about highlighting an item in a JList? [duplicate]

I am trying to change JList rows dynamically. I need change nth row colour, highlight it(n is unknown during compilation). I saw a lot of examples with custom ListCellRenderer, but all were "static".
In other words I have JList with x rows. During runtime my "business logic" detects nth row is important. So I want make its background green, wait one second, and then make it white again. One more thing, don't wan change row selection.
What is the best way to do so?

Simple, set a custom ListCellRenderer to your JList using:
list.setCellRenderer(myListCellrenderer);
Now inside the overridden method getListCellRendererComponent() do something like this:
public Component getListCellRendererComponent(.....) {
Component c = super.getListCellRendererComponent();
c.setBackGround(Color.blue)
return c;
}
The above example assumed that your custom renderer overrid DefaultListCellRenderer

Based on ListDemo sample from SUN.
If you enter some text in the textfield which isn't in the list and you hit highlight it gets added.
If the text is in the list and you hit highlight the entry in the list gets temporarily highlighted blue.
Note the solution here with the match field is just for demo. For more correct implementation consider the other ideas proposed and consider using javax.swing.Timer
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class ListDemo extends JPanel {
private JList list;
private DefaultListModel listModel;
public String match = null;
private static final String hireString = "Highlight";
private JTextField employeeName;
public ListDemo() {
super(new BorderLayout());
listModel = new DefaultListModel();
listModel.addElement("Test1");
listModel.addElement("Test2");
listModel.addElement("Test3");
list = new JList(listModel);
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.setVisibleRowCount(5);
list.setCellRenderer(new MyListCellRenderer());
JScrollPane listScrollPane = new JScrollPane(list);
JButton hireButton = new JButton(hireString);
HireListener hireListener = new HireListener(hireButton);
hireButton.setActionCommand(hireString);
hireButton.addActionListener(hireListener);
hireButton.setEnabled(false);
employeeName = new JTextField(10);
employeeName.addActionListener(hireListener);
employeeName.getDocument().addDocumentListener(hireListener);
listModel.getElementAt(list.getSelectedIndex()).toString();
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new BoxLayout(buttonPane,
BoxLayout.LINE_AXIS));
buttonPane.add(Box.createHorizontalStrut(5));
buttonPane.add(employeeName);
buttonPane.add(hireButton);
buttonPane.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
add(listScrollPane, BorderLayout.CENTER);
add(buttonPane, BorderLayout.PAGE_END);
}
class MyListCellRenderer extends JLabel implements ListCellRenderer {
public MyListCellRenderer() {
setOpaque(true);
}
public Component getListCellRendererComponent(JList paramlist, Object value, int index, boolean isSelected, boolean cellHasFocus) {
setText(value.toString());
if (value.toString().equals(match)) {
setBackground(Color.BLUE);
SwingWorker worker = new SwingWorker() {
#Override
public Object doInBackground() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) { /*Who cares*/ }
return null;
}
#Override
public void done() {
match = null;
list.repaint();
}
};
worker.execute();
} else
setBackground(Color.RED);
return this;
}
}
class HireListener implements ActionListener, DocumentListener {
private boolean alreadyEnabled = false;
private JButton button;
public HireListener(JButton button) {
this.button = button;
}
public void actionPerformed(ActionEvent e) {
String name = employeeName.getText();
if (listModel.contains(name)) {
match = name;
list.repaint();
employeeName.requestFocusInWindow();
employeeName.selectAll();
return;
}
if (name.equals("")) {
Toolkit.getDefaultToolkit().beep();
employeeName.requestFocusInWindow();
employeeName.selectAll();
return;
}
int index = list.getSelectedIndex();
if (index == -1)
index = 0;
else
index++;
listModel.insertElementAt(employeeName.getText(), index);
employeeName.requestFocusInWindow();
employeeName.setText("");
list.setSelectedIndex(index);
list.ensureIndexIsVisible(index);
}
public void insertUpdate(DocumentEvent e) {
enableButton();
}
public void removeUpdate(DocumentEvent e) {
handleEmptyTextField(e);
}
public void changedUpdate(DocumentEvent e) {
if (!handleEmptyTextField(e))
enableButton();
}
private void enableButton() {
if (!alreadyEnabled)
button.setEnabled(true);
}
private boolean handleEmptyTextField(DocumentEvent e) {
if (e.getDocument().getLength() <= 0) {
button.setEnabled(false);
alreadyEnabled = false;
return true;
}
return false;
}
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("ListDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComponent newContentPane = new ListDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() { createAndShowGUI(); }
});
}
}

Your custom ListCellRenderer, which implements the method getListCellRendererComponent, will have access to both the JList and the value that it is redering. This gives you a couple options for how to determine when to paint the nth row green:
You could subclass JList and have the renderer ask it which color to use for the bg. The JList subclass could trigger a repaint when the business logic determines that it is time for the nth row to be green, and then start an Swing Timer to trigger a repaint returning the bg back to normal
When the business logic determines when you should show the row as green, you also have the option of setting state on the backing object of the row, and test it for that state within getListCellRendererComponent, setting the bg green if the state is correct. Again, you have the option of setting an Swing Timer to revert the state on the backing object.