Java Swing | JDialog with examples

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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:

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

Commonly used methods

setLayout(LayoutManager m) : sets the layout of the dialog to specified layout manager
setJMenuBar(JMenuBar m) : sets the menubar of the dialog to specified menubar
add(Component c): adds component to the dialog
isVisible(boolean b): sets the visibility of the dialog, if value of the boolean is true then visible else invisible
update(Graphics g) : calls the paint(g) function
remove(Component c) : removes the component c
getGraphics() : returns the graphics context of the component.
getLayeredPane() : returns the layered pane for the dialog
setContentPane(Container c) :sets the content pane for the dialog
setLayeredPane(JLayeredPane l) : set the layered pane for the dialog
setRootPane(JRootPane r) : sets the rootPane for the dialog
getJMenuBar() : returns the menubar of the component
setTransferHandler(TransferHandler n) : Sets the transferHandler property, which is a mechanism to support transfer of data into this component.
setRootPaneCheckingEnabled(boolean enabled) : Sets whether calls to add and setLayout are forwarded to the contentPane.
setRootPane(JRootPane root) :Sets the rootPane property of the dialog.
setGlassPane(Component glass) : Sets the glassPane property of the dialog.
repaint(long time, int x, int y, int width, int height): Repaints the specified rectangle of this component within time milliseconds.
remove(Component c): Removes the specified component from the dialog.
isRootPaneCheckingEnabled() : Returns whether calls to add and setLayout are forwarded to the contentPane or not .
getTransferHandler() : returns the transferHandler property.
getRootPane() : Returns the rootPane object for this dialog.
getGlassPane() : Returns the glassPane object for this dialog.
createRootPane() : Called by the constructor methods to create the default rootPane.
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);
        }
    }
}