How to center a window with Container

Hi I'm using a container class only object. Not using JFrame window which is centered with frame.setLocationRelativeTo(null); sentence.

I just want the splash screen of my application appears in the center of the desktop not in the upper-left part.

Any solution? I'm new with Java :D thanks in advance

This is the code

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public class MenuSwing3 extends JFrame {

Container contenedor;
JTextArea areaTexto;

JMenuBar barraMenu = new JMenuBar();
JMenu menuFirmar = new JMenu("Firmar");
JMenu menuValidar = new JMenu("Validar");
JMenu menuAyuda = new JMenu("Ayuda");
JMenuItem opcionEnvelope = new JMenuItem("Documento XML en formato Envelope");
JMenuItem opcionEnveloping = new JMenuItem("Documento XML en formato Enveloping");
JMenuItem opcionDetached = new JMenuItem("Documento anexo - formato Detached");
JMenuItem opcionSalirF = new JMenuItem("Salir");

//Constructor de la clase MenuSwing3
public MenuSwing3() {

super("Firma digital de documentos");

contenedor = getContentPane();
menuFirmar.add(opcionEnvelope);
menuFirmar.add(opcionEnveloping);
menuFirmar.add(opcionDetached);
menuFirmar.add(opcionSalirF);
barraMenu.add(menuFirmar);
barraMenu.add(menuValidar);
barraMenu.add(menuAyuda);
setJMenuBar(barraMenu);
addWindowListener(new WindowHandler());
opcionEnvelope.addActionListener(new VigilaMenu());
opcionEnveloping.addActionListener(new VigilaMenu());
opcionDetached.addActionListener(new VigilaMenu());
opcionSalirF.addActionListener(new VigilaMenu());
setSize(512,384);
areaTexto = new JTextArea();
contenedor.add("Center",areaTexto);
setIconImage(Toolkit.getDefaultToolkit().createIma ge("Icono.gif"));
show();
}

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I don't understand your question. You are using a JFrame. You are aware of the setLocationRelativeTo( null ) method. Basic code should be:

Code:

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setSize(...);
setLocationRelativeTo( null );
setVisible( true );

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If you need more help post your SSCCE.

Thank you very much. You are right and it works!

I forgot that class extended JFrame. The confusion came because Container is upper in the heritance so I thought I had to use only the methods for Container class.

http://java.sun.com/new2java/divelog...heritance1.jpg

By the way, what's better? the show(); method or setVisible( true );

I hope in a few weeks I can manage better with Java :p

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By the way, what's better? the show(); method or setVisible( true );

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Read the API description for both methods to see whast the difference is.

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Originally Posted by camickr

Read the API description for both methods to see whast the difference is.

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It seems show method is deprecated! I will use setVisible :D

Code:

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setVisible

public void setVisible(boolean b)

    Shows or hides this component depending on the value of parameter b.

    Parameters:
        b - if true, shows this component; otherwise, hides this component
    Since:
        JDK1.1
    See Also:
        isVisible()

show

@Deprecated
public void show()

    Deprecated. As of JDK version 1.1, replaced by setVisible(boolean).

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Quote:

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It seems show method is deprecated!

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Exactly. I'm surprised the compiler doesn't give you warning messages. I hope you don't ignore them.