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DEV2.1/CTRLBLANC/Exo5/Fermeture.java

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+import java.awt.*;
+import javax.swing.*;
+
+
+
+public class Fermeture{
+	public static void main(String[] args) {
+		JFrame fenetre = new JFrame();
+		fenetre.setSize(800, 800);
+		Oui yeet = new Oui();
+		while(yeet.checkVrai()!= true){
+			fenetre.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+			fenetre.setVisible(true);
+
+		}
+		fenetre.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		fenetre.addWindowListener(yeet);
+		fenetre.setVisible(true);
+
+	}
+}

DEV2.1/CTRLBLANC/Exo5/Oui.java

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+import java.awt.event.*;
+import javax.swing.*;
+
+public class Oui implements WindowListener{
+	private int a;
+	public Oui(){
+		super();
+		this.a=0;
+	}
+	public void windowActivated(WindowEvent evenement){}    // premier plan
+	public void windowClosed(WindowEvent evenement){}     // après fermeture
+	public void windowClosing(WindowEvent evenement){}        // avant fermeture
+	public void windowDeactivated(WindowEvent evenement){}    // arrière-plan
+	public void windowDeiconified(WindowEvent evenement){}   // restauration
+	public void windowOpened(WindowEvent evenement){}
+	public void windowIconified(WindowEvent e){
+		this.a=1;
+	}
+	public boolean checkVrai(){
+		if (this.a == 1){
+			return true;
+		}
+		else{
+			return false;
+		}
+	}
+	
+}