How i close my frame when i click in the button???

Hi...
I have a programa that have one button, when I click in the button open a frame and into the frame have a other jbutton and I want to close my frame when I click in the button...
I tried this, but it closes my program all:
btn4.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});

How I do??? to close my frame only...

yourframe.dispose()

Ocurred an error:
local variable janela is accessed from within inner class; needs to be declared finaljanela.dispose();
what is this???

Can you post the code for you JFrame class you are trying to close.

Here...
JDialog janela = new JDialog(this, botao.getText(),true);
janela.getContentPane().setLayout(null);
janela.setSize(550,150);
janela.setLocation(200,200);
janela.setResizable(false);
/** Inserir dados sobre servi�os da tela aqui */
JLabel label1 = new JLabel ("URL: "+url);
label1.setBounds(30,10,540,30);
janela.getContentPane().add(label1);
JLabel label2 = new JLabel ("TEMPO DE RESPOSTA: "+servico.getTempoResposta()+" segundos ");
label2.setBounds(30,10,540,90);
janela.getContentPane().add(label2);
janela.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
//mostra subjanela
janela.show();

A method-local variable (the dialog) is being accessed from within an anonymous class. You must declare the method-local variable as final:
JDialog janela = new JDialog(this, botao.getText(),true);
<becomes>
final JDialog janela = new JDialog(this, botao.getText(),true);

Then you'll be fine.

Dana is correct. Or you could make your JDialog variable a global variable. Either way will work. Then just call dispose() on the JDialog instead of System.exit(0) as this will cause the JVM to kill your application.

Thank's Danna and friends, you are correct....