Display Message
/*
* This example is from the book "Java Foundation Classes in a Nutshell".
* Written by David Flanagan. Copyright (c) 1999 by O'Reilly & Associates.
* You may distribute this source code for non-commercial purposes only.
* You may study, modify, and use this example for any purpose, as long as
* this notice is retained. Note that this example is provided "as is",
* WITHOUT WARRANTY of any kind either expressed or implied.
*/
import java.awt.*; // AWT classes
import javax.swing.*; // Swing components and classes
import javax.swing.border.*; // Borders for Swing components
import java.awt.event.*; // Basic event handling
public class DisplayMessage {
public static void main(String[] args) {
/*
* Step 1: Create the components
*/
JLabel msgLabel = new JLabel(); // Component to display the question
JButton yesButton = new JButton(); // Button for an affirmative response
JButton noButton = new JButton(); // Button for a negative response
/*
* Step 2: Set properties of the components
*/
msgLabel.setText(args[0]); // The msg to display
msgLabel.setBorder(new EmptyBorder(10,10,10,10)); // A 10-pixel margin
yesButton.setText((args.length >= 2)?args[1]:"Yes"); // Text for Yes button
noButton.setText((args.length >= 3)?args[2]:"No"); // Text for no button
/*
* Step 3: Create containers to hold the components
*/
JFrame win = new JFrame("Message"); // The main application window
JPanel buttonbox = new JPanel(); // A container for the two buttons
/*
* Step 4: Specify LayoutManagers to arrange components in the containers
*/
win.getContentPane().setLayout(new BorderLayout()); // layout on borders
buttonbox.setLayout(new FlowLayout()); // layout left-to-right
/*
* Step 5: Add components to containers, with optional layout constraints
*/
buttonbox.add(yesButton); // add yes button to the panel
buttonbox.add(noButton); // add no button to the panel
// add JLabel to window, telling the BorderLayout to put it in the middle
win.getContentPane().add(msgLabel, "Center");
// add panel to window, telling the BorderLayout to put it at the bottom
win.getContentPane().add(buttonbox, "South");
/*
* Step 6: Arrange to handle events in the user interface.
*/
yesButton.addActionListener(new ActionListener() { // Note: inner class
// This method is called when the Yes button is clicked.
public void actionPerformed(ActionEvent e) { System.exit(0); }
});
noButton.addActionListener(new ActionListener() { // Note: inner class
// This method is called when the No button is clicked.
public void actionPerformed(ActionEvent e) { System.exit(1); }
});
/*
* Step 7: Display the GUI to the user
*/
win.pack(); // Set the size of the window based its children's sizes.
win.show(); // Make the window visible.
}
}
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