Como se puede ver, la ventana
aparece con un borde mínimo y la etiqueta de control que visualiza un mensaje.
package masterdavidjavabasico;
import java.awt.*;
import java.awt.event.*;
public class ventana
{
public static void main(String [] args)
{
AppFrame f = new AppFrame();
f.setSize(200, 200);
f.addWindowListener(new WindowAdapter() { public void
windowClosing(WindowEvent e) {System.exit(0);}});
f.show();
}
}
class AppFrame extends Frame implements ActionListener
{
Button b1, b2;
labelWindow window;
AppFrame()
{
setLayout(new FlowLayout());
b1 = new Button("Visualizar la ventana");
add(b1);
b1.addActionListener(this);
b2 = new Button("Ocultar la ventana");
add(b2);
b2.addActionListener(this);
window = new labelWindow(this);
window.setSize(300, 200);
window.setLocation(300, 200);
}
public void actionPerformed(ActionEvent event)
{
if(event.getSource() == b1){
window.setVisible(true);
}
if(event.getSource() == b2){
window.setVisible(false);
}
}
}
class labelWindow extends Window {
Label label;
labelWindow(AppFrame af){
super(af);
setLayout(new FlowLayout());
label = new Label("Hola desde Java!");
add(label);
}
public void paint (Graphics g)
{
int width = getSize().width;
int height = getSize().height;
g.drawRect(0, 0, --width, --height);
}
}
