Java WindowEvent WINDOW_GAINED_FOCUS
Syntax
WindowEvent.WINDOW_GAINED_FOCUS has the following syntax.
public static final int WINDOW_GAINED_FOCUS
Example
In the following code shows how to use WindowEvent.WINDOW_GAINED_FOCUS field.
//w w w . j a v a2 s.co m
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
public class Main extends JFrame {
public Main() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
enableEvents(java.awt.AWTEvent.WINDOW_EVENT_MASK);
}
protected void processWindowEvent(WindowEvent e) {
if (e.getID() == WindowEvent.WINDOW_GAINED_FOCUS) {
System.out.println(WindowEvent.WINDOW_GAINED_FOCUS);
dispose();
System.exit(0);
}
super.processWindowEvent(e); // Pass on the event
}
public static void main(String[] a) {
Main window = new Main();
window.setBounds(30, 30, 300, 300);
window.setVisible(true);
}
}
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