Determining When a Frame or Window Is Opened or Closed

    

import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class Main {
  public static void main() {
    Frame frame = new Frame();

    WindowListener listener = new WindowAdapter() {
      public void windowOpened(WindowEvent evt) {
        Frame frame = (Frame) evt.getSource();
        System.out.println(frame.getTitle());
      }

      public void windowClosing(WindowEvent evt) {
        Frame frame = (Frame) evt.getSource();

        System.out.println(frame.getTitle());

      }

      public void windowClosed(WindowEvent evt) {
        Frame frame = (Frame) evt.getSource();
        System.out.println(frame.getTitle());
      }
    };

    frame.addWindowListener(listener);
    frame.setVisible(true);
  }
}

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Determining When a Frame or Window Is Opened or Closed : Frame « Swing JFC « Java

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