interface Window {

    public void open();

    public void close();

    public void activated();

    public void iconified();

    public void deiconified();

}

abstract class WindowAdapter implements Window {

    public void open() {

    };

    public void close() {

    };

    public void activated() {

    };

    public void iconified() {

    };

    public void deiconified() {

    };

}

class WindowImpl extends WindowAdapter {

    public void open() {

        System.out.println("Open the window....");

    }

    public void close() {

        System.out.println("Close the window....");

    }

}

public class AdapterDemo {

    public static void main(String[] args) {

        Window window = new WindowImpl();

        window.open();

        window.close();

    }

}