some changes

DEV/DEV3.1/TP03/Exercise1/GridWindow.java

@@ -0,0 +1,86 @@
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Insets;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+
+public class GridWindow extends JFrame {
+    
+    public GridWindow() {
+        this.setSize(200, 200);
+        this.setLocationRelativeTo(null);
+        this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+
+        this.getContentPane().setLayout(new GridBagLayout());
+
+        this.placeButtons();
+
+        this.addWindowListener(new GridWindowClosedEvent(this));
+    }
+
+    private void placeButtons() {
+        GridBagConstraints constraints = new GridBagConstraints();
+
+        JButton one = new JButton("1");
+        constraints.gridx = 0; 
+        constraints.gridy = 0;
+        constraints.gridwidth = 2; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(one, constraints);
+
+        JButton two = new JButton("2");
+        constraints.gridx = 2; 
+        constraints.gridy = 0;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 2;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(two, constraints);
+
+        JButton three = new JButton("3");
+        constraints.gridx = 1; 
+        constraints.gridy = 2;
+        constraints.gridwidth = 2; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(three, constraints);
+
+        JButton four = new JButton("4");
+        constraints.gridx = 0; 
+        constraints.gridy = 1;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 2;
+        constraints.fill = GridBagConstraints.BOTH;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 1.0;
+        constraints.weighty = 1.0;
+
+        this.getContentPane().add(four, constraints);
+
+        JButton five = new JButton("5");
+        constraints.gridx = 1; 
+        constraints.gridy = 1;
+        constraints.gridwidth = 1; 
+        constraints.gridheight = 1;
+        constraints.fill = GridBagConstraints.NONE;
+        constraints.insets = new Insets(0, 0, 0, 0);
+        constraints.weightx = 0.0;
+        constraints.weighty = 0.0;
+
+        this.getContentPane().add(five, constraints);
+    }
+}

DEV/DEV3.1/TP03/Exercise1/GridWindowClosedEvent.java

@@ -0,0 +1,19 @@
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
+
+import javax.swing.JOptionPane;
+
+public class GridWindowClosedEvent extends WindowAdapter {
+
+    private GridWindow window;
+
+    public GridWindowClosedEvent(GridWindow window) {
+        this.window = window;
+    }
+    
+    @Override
+    public void windowClosing(WindowEvent event) {
+        int result = JOptionPane.showConfirmDialog(this.window, "Are you sure you want to close this window?", "Close current window", JOptionPane.YES_NO_OPTION);
+        if(result == JOptionPane.YES_OPTION) this.window.dispose();
+    }
+}

DEV/DEV3.1/TP03/Exercise1/Main.java

@@ -0,0 +1,7 @@
+public class Main {
+
+    public static void main(String[] args) {
+        GridWindow window = new GridWindow();
+        window.setVisible(true);
+    }
+}