import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class Main {
public static void main() {
Frame frame = new Frame();
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
Frame frame = (Frame) evt.getSource();
frame.setVisible(false);
// frame.dispose();
}
});
}
}
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