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Java Program to determine when a Frame or Window is closing in Java
To determine when a Window is closing in Java, use the WindowListener, which is the listener interface for receiving window events..
WindowListener listener = new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
Frame frame = (Frame) evt.getSource();
System.out.println("Closing = "+frame.getTitle());
}
};Above, we have used the windowClosing() method, which is invoked when a window is in the process of being closed −
public void windowClosing(WindowEvent evt) {
Frame frame = (Frame) evt.getSource();
System.out.println("Closing = "+frame.getTitle());
}The following is an example to determine when a Frame or Window is closing in Java −
Example
package my;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
public class SwingDemo {
public static void main(String args[]) throws BadLocationException {
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
WindowListener listener = new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
Frame frame = (Frame) evt.getSource();
System.out.println("Closing = "+frame.getTitle());
}
};
Container container = frame.getContentPane();
JTextPane pane = new JTextPane();
SimpleAttributeSet attributeSet = new SimpleAttributeSet();
StyleConstants.setItalic(attributeSet, true);
StyleConstants.setForeground(attributeSet, Color.black);
StyleConstants.setBackground(attributeSet, Color.orange);
pane.setCharacterAttributes(attributeSet, true);
pane.setText("This is a demo text!");
JScrollPane scrollPane = new JScrollPane(pane);
container.add(scrollPane, BorderLayout.CENTER);
frame.setSize(550, 300);
frame.addWindowListener(listener); frame.setVisible(true);
}
}The output is as follows. The following is visible on Console −
Output
Updated on: 30-Jul-2019
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