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Java Swing | JDialog with examples

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  • Difficulty Level : Hard
  • Last Updated : 16 Apr, 2021

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
 


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