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    <p>This reminded me of a very favourite post of mine, using <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/Window.html#setLocationByPlatform%28boolean%29" rel="nofollow noreferrer">Window.setLocationByPlatform(true)</a>, on StackOverflow.</p> <p><a href="https://stackoverflow.com/q/7143287/1057230">How to best position Swing GUIs</a></p> <p><strong>EDIT 1 :</strong></p> <p>You can add a <code>FocusListener</code> to your <code>JDialog</code> and on <code>focusGained(...)</code> method, you can use <code>setLocationRelativeTo(null)</code> for both the <code>JFrame</code> and the <code>JDialog</code>, so that they both come to the center of the screen no matter where they are before.</p> <pre><code>import java.awt.*; import java.awt.event.FocusEvent; import java.awt.event.FocusListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; /** * Created with IntelliJ IDEA. * User: Gagandeep Bali * Date: 1/14/13 * Time: 7:34 PM * To change this template use File | Settings | File Templates. */ public class FrameFocus { private JFrame mainwindow; private CustomDialog customDialog; private void displayGUI() { mainwindow = new JFrame("Frame Focus Window Example"); customDialog = new CustomDialog(mainwindow, "Modal Dialog", true); mainwindow.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); JPanel contentPane = new JPanel(); JButton mainButton = new JButton( "Click me to open a MODAL Dialog"); mainButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (!customDialog.isShowing()) customDialog.setVisible(true); } }); contentPane.add(mainButton); mainwindow.setContentPane(contentPane); mainwindow.pack(); mainwindow.setLocationByPlatform(true); mainwindow.setVisible(true); } public static void main(String... args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new FrameFocus().displayGUI(); } }); } } class CustomDialog extends JDialog { private JFrame mainWindow; public CustomDialog(JFrame owner, String title, boolean modal) { super(owner, title, modal); mainWindow = owner; JPanel contentPane = new JPanel(); JLabel dialogLabel = new JLabel( "I am a Label on JDialog.", JLabel.CENTER); contentPane.add(dialogLabel); setContentPane(contentPane); pack(); addFocusListener(new FocusListener() { @Override public void focusGained(FocusEvent e) { mainWindow.setLocationRelativeTo(null); setLocationRelativeTo(null); } @Override public void focusLost(FocusEvent e) { /* * Nothing written for this part yet */ } }); } } </code></pre> <p><strong>EDIT 2 :</strong></p> <p>I searched a bit here and there, and it turns out, in my opinion, that actually on which <code>Monitor Screen</code> your application comes at the first instance, will determine it's <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/Component.html#getGraphicsConfiguration%28%29" rel="nofollow noreferrer">GraphicsConfiguration</a>. Though as I roamed through the API, there is only a getter method for the said <code>GraphicsConfiguration</code> thingy and no setter methods for the same (Still You can specify one through the constructor of any top level Window i.e. <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JFrame.html#JFrame%28java.lang.String,%20java.awt.GraphicsConfiguration%29" rel="nofollow noreferrer">JFrame(...)</a>/<a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JDialog.html#JDialog%28java.awt.Frame,%20java.lang.String,%20boolean,%20java.awt.GraphicsConfiguration%29" rel="nofollow noreferrer">JDialog(...)</a>).</p> <p>Now you can occupy your head with this code, which can be used to determine the appropriate location, that you want to set, again, you might have to use <code>focusGain()</code> method in my opinion, to satisfy condition 2 of your question. Have a look at the code attached, though no need to create a <code>new JFrame/JDialog</code>, just watch how to get coordinates for the screen (that you can add in the <code>focusGain()</code> method to determine the location of the whole Application.)</p> <pre><code>GraphicsEnvironment ge = GraphicsEnvironment. getLocalGraphicsEnvironment(); GraphicsDevice[] gs = ge.getScreenDevices(); for (int j = 0; j &lt; gs.length; j++) { GraphicsDevice gd = gs[j]; GraphicsConfiguration[] gc = gd.getConfigurations(); for (int i=0; i &lt; gc.length; i++) { JFrame f = new JFrame(gs[j].getDefaultConfiguration()); Canvas c = new Canvas(gc[i]); Rectangle gcBounds = gc[i].getBounds(); int xoffs = gcBounds.x; int yoffs = gcBounds.y; f.getContentPane().add(c); f.setLocation((i*50)+xoffs, (i*60)+yoffs); f.show(); } } </code></pre> <p><strong>EDIT 3 :</strong></p> <p>Try to change this :</p> <pre><code>int x = loc.getX() + (mainWindow.getWidth() - getWidth()) / 2; int y = loc.getY() + (mainWindow.getHeight() - getHeight()) / 2; setLocation(x, y); </code></pre> <p>to just : </p> <pre><code>setLocationRelativeTo(mainWindow); </code></pre> <p>To test the above thingy, I used my <code>FrameFocus</code> Class as is, though I had added your changes to my <code>CustomDialog</code> method, as shown in this modified <code>CustomDialog</code> Class.</p> <pre><code>class CustomDialog extends JDialog { private JFrame mainWindow; public CustomDialog(JFrame owner, String title, boolean modal) { super(owner, title, modal); mainWindow = owner; JPanel contentPane = new JPanel(); JLabel dialogLabel = new JLabel( "I am a Label on JDialog.", JLabel.CENTER); contentPane.add(dialogLabel); setContentPane(contentPane); pack(); addFocusListener(new FocusListener() { @Override public void focusGained(FocusEvent e) { //mainWindow.setLocationRelativeTo(null); //setLocationRelativeTo(null); GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment(); GraphicsDevice[] gs = ge.getScreenDevices(); for (int j = 0; j &lt; gs.length; j++) { GraphicsDevice gd = gs[j]; GraphicsConfiguration[] gc = gd.getConfigurations(); for (int i=0; i &lt; gc.length; i++) { Rectangle gcBounds = gc[i].getBounds(); Point loc = mainWindow.getLocationOnScreen(); if (gcBounds.contains(loc)) { System.out.println("at " + j + " screen"); int x = gcBounds.x + (gcBounds.width - mainWindow.getWidth()) / 2; int y = gcBounds.y + (gcBounds.height - mainWindow.getHeight()) / 2; mainWindow.setLocation(x, y); //x = (int) (loc.getX() + (mainWindow.getWidth() - CustomDialog.this.getWidth()) / 2); //y = (int) (loc.getY() + (mainWindow.getHeight() - CustomDialog.this.getHeight()) / 2); //CustomDialog.this.setLocation(x, y); CustomDialog.this.setLocationRelativeTo(mainWindow); break; } } } } @Override public void focusLost(FocusEvent e) { /* * Nothing written for this part yet */ } }); } } </code></pre>
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    1. POOptimal location for a modal JDialog to avoid stuck
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    1. CO+1 my favourite too, I like the screenshots :)
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    2. COI move JFrame to second screen, but JDialog appears on the first. It does not address issue #1.
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      1. USNikolay Kuznetsov
    3. CO@NikolayKuznetsov : What if you you add a FocusListener, to your `JDialog` and perform steps as mentioned in my edit for the `focusGained()` method ? I hope this workaround can work for both the situations.
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