Java Swing | JDialog with examples

JDialog is a part Java swing package. The main purpose of the dialog is to add components to it. JDialog can be customized according to user need .
Constructor of the class are: 

1. JDialog() : creates an empty dialog without any title or any specified owner
2. JDialog(Frame o) :creates an empty dialog with a specified frame as its owner
3. JDialog(Frame o, String s) : creates an empty dialog with a specified frame as its owner 
   and a specified title
4. JDialog(Window o) : creates an empty dialog with a specified window as its owner
5. JDialog(Window o, String t) : creates an empty dialog with a specified window as its owner and specified title.
6. JDialog(Dialog o) :creates an empty dialog with a specified dialog as its owner
7. JDialog(Dialog o, String s) : creates an empty dialog with a specified dialog as its owner and specified title.

Commonly used methods 

1. setLayout(LayoutManager m) : sets the layout of the dialog to specified layout manager
2. setJMenuBar(JMenuBar m) : sets the menubar of the dialog to specified menubar
3. add(Component c): adds component to the dialog
4. isVisible(boolean b): sets the visibility of the dialog, if value of the boolean is true then visible else invisible
5. update(Graphics g) : calls the paint(g) function
6. remove(Component c) : removes the component c
7. getGraphics() : returns the graphics context of the component.
8. getLayeredPane() : returns the layered pane for the dialog
9. setContentPane(Container c) :sets the content pane for the dialog
10. setLayeredPane(JLayeredPane l) : set the layered pane for the dialog
11. setRootPane(JRootPane r) : sets the rootPane for the dialog
12. getJMenuBar() : returns the menubar of the component
13. setTransferHandler(TransferHandler n) : Sets the transferHandler property, which is a mechanism to support transfer of data into this component.
14. setRootPaneCheckingEnabled(boolean enabled) : Sets whether calls to add and setLayout are forwarded to the contentPane.
15. setRootPane(JRootPane root) :Sets the rootPane property of the dialog.
16. setGlassPane(Component glass) : Sets the glassPane property of the dialog.
17. repaint(long time, int x, int y, int width, int height): Repaints the specified rectangle of this component within time milliseconds.
18. remove(Component c): Removes the specified component from the dialog.
19. isRootPaneCheckingEnabled() : Returns whether calls to add and setLayout are forwarded to the contentPane or not .
20. getTransferHandler() : returns the transferHandler property.
21. getRootPane() : Returns the rootPane object for this dialog.
22. getGlassPane() : Returns the glassPane object for this dialog.
23. createRootPane() : Called by the constructor methods to create the default rootPane.
24. addImpl(Component co, Object c, int i) : Adds the specified child Component to the dialog.

The following programs will illustrate the use of JDialog
1 .Program to create a simple JDialog

Java

// java Program to create a simple JDialog
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame implements ActionListener {

    // frame
    static JFrame f;

    // main class
    public static void main(String[] args)
    {
        // create a new frame
        f = new JFrame("frame");

        // create a object
        solve s = new solve();

        // create a panel
        JPanel p = new JPanel();

        JButton b = new JButton("click");

        // add actionlistener to button
        b.addActionListener(s);

        // add button to panel
        p.add(b);

        f.add(p);

        // set the size of frame
        f.setSize(400, 400);

        f.show();
    }
    public void actionPerformed(ActionEvent e)
    {
        String s = e.getActionCommand();
        if (s.equals("click")) {
            // create a dialog Box
            JDialog d = new JDialog(f, "dialog Box");

            // create a label
            JLabel l = new JLabel("this is a dialog box");

            d.add(l);

            // setsize of dialog
            d.setSize(100, 100);

            // set visibility of dialog
            d.setVisible(true);
        }
    }
}

Output:

2. Program to create a dialog within a dialog

Java

// java Program to create a dialog within a dialog
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class solve extends JFrame implements ActionListener {

    // frame
    static JFrame f;

    // dialog
    static JDialog d, d1;

    // main class
    public static void main(String[] args)
    {
        // create a new frame
        f = new JFrame("frame");

        // create a object
        solve s = new solve();

        // create a panel
        JPanel p = new JPanel();

        JButton b = new JButton("click");

        // add actionlistener to button
        b.addActionListener(s);

        // add button to panel
        p.add(b);

        f.add(p);

        // set the size of frame
        f.setSize(400, 400);

        f.show();
    }
    public void actionPerformed(ActionEvent e)
    {
        String s = e.getActionCommand();
        if (s.equals("click")) {
            // create a dialog Box
            d = new JDialog(f, "dialog Box");

            // create a label
            JLabel l = new JLabel("this is first dialog box");

            // create a button
            JButton b = new JButton("click me");

            // add Action Listener
            b.addActionListener(this);

            // create a panel
            JPanel p = new JPanel();

            p.add(b);
            p.add(l);

            // add panel to dialog
            d.add(p);

            // setsize of dialog
            d.setSize(200, 200);

            // set visibility of dialog
            d.setVisible(true);
        }
        else { // create a dialog Box
            d1 = new JDialog(d, "dialog Box");

            // create a label
            JLabel l = new JLabel("this is second dialog box");

            d1.add(l);

            // setsize of dialog
            d1.setSize(200, 200);

            // set location of dialog
            d1.setLocation(200, 200);

            // set visibility of dialog
            d1.setVisible(true);
        }
    }
}

Output :

Note : The above programs might not run in an online compiler please use an offline IDE