DELEGATION MODEL

13. Java Program to Close the Frame using WindowAdapter Class

            import java.awt.*;
            import java.awt.event.WindowAdapter;
            import java.awt.event.WindowEvent;
            import java.awt.GraphicsEnvironment;
            
            public class AvailableFontsApp extends Frame {
            
                public AvailableFontsApp() {
                    // Set up the frame
                    setTitle("Available Fonts");
                    setSize(400, 300);
                    setLayout(new BorderLayout());
            
                    // TextArea to display the available fonts
                    TextArea fontDisplayArea = new TextArea();
                    fontDisplayArea.setEditable(false);
            
                    // Retrieve available font family names
                    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
                    String[] fontNames = ge.getAvailableFontFamilyNames();
            
                    // Display font names in the TextArea
                    for (String fontName : fontNames) {
                        fontDisplayArea.append(fontName + "
            ");
                    }
            
                    // Add TextArea to the frame
                    add(fontDisplayArea, BorderLayout.CENTER);
            
                    // Set up close operation
                    addWindowListener(new WindowAdapter() {
                        
                        public void windowClosing(WindowEvent windowEvent) {
                            System.exit(0);
                        }
                    });
                }
            
                public static void main(String[] args) {
                    // Create and show the frame
                    AvailableFontsApp app = new AvailableFontsApp();
                    app.setVisible(true);
                }
            }
        

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