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What are the differences between JFrame and JDialog in Java?
JFrame
- The components added to the frame are referred to as its contents, these are managed by the contentPane. To add a component to a JFrame, we must use its contentPane instead.
- A JFrame contains a window with title, border, (optional) menu bar and user-specified components.
- A JFrame can be moved, resized, iconified and it is not a subclass of JComponent.
- By default, JFrame is displayed in the upper-left corner of the screen. To display a frame at a specified location, we can use the setLocation(x, y) method in the JFrame class.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JFrameDemo {
public static void main(String s[]) {
JFrame frame = new JFrame("JFrame Demo");
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JLabel lbl = new JLabel("JFrame Demo");
lbl.setPreferredSize(new Dimension(175, 100));
frame.getContentPane().add(lbl, BorderLayout.CENTER);
frame.setSize(375, 275);
frame.setVisible(true);
}
}Output
JDialog
- The JDialog is very similar to a JFrame except that the JDialog can be set modally. Modal means that no other window can be used or activated while the corresponding JDialog is being displayed.
- Modal dialogs block input to other top-level windows and Modeless dialogs allow input to other windows.
- Unlike JFrame, JDialog does not hold minimize and maximize buttons at the top right corner of the window.
Example
import javax.swing.JDialog;
import javax.swing.JLabel;
public class JDialogDemo extends JDialog {
public static void main(String[] args) {
try {
JDialogDemo dialog = new JDialogDemo();
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
public JDialogDemo() {
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setTitle("Welcome to Tutorials Point");
setBounds(100, 100, 359, 174);
getContentPane().setLayout(null);
JLabel label = new JLabel("Welcome to Tutorials Point");
label.setBounds(86, 37, 175, 29);
getContentPane().add(label);
}
}Output
Updated on: 07-Feb-2020
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