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removing panels...

1 reply. Most recent reply: Mar 23, 2002 12:31 PM by Charles Bell

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Mary

Posts: 7
Nickname: dj
Registered: Mar, 2002

removing panels...

Posted: Mar 23, 2002 3:00 AM

I have tried to remove panels using the remove method in the Action performed event. I have used the repaint() method, revalidate() method and frame.pack() method. Nothing seems to be working.

public void actionPerformed(ActionEvent evt)
{
if (evt.getSource()== hardwareBtn)
{
controlArea.remove(lampPanel, kettlePanel, ovenPanel, microwavePanel);
content.repaint();

}
}

also i was just wondering if you can verify both a username and password in the one if statement. We can username verification working but can't get the two working together

public void actionPerformed(ActionEvent e)
{
if (e.getSource()==loginBtn)
{
String s = nameTxt.getText();
String t = passwordTxt.getText();
if (s.equals ("tange") && t.equals("100045713"))
{
JOptionPane.showMessageDialog(null,"Welcome " +nameTxt.getText());
}
}

Re: removing panels...

Posted: Mar 23, 2002 12:31 PM

Posted by: Charles Bell Posts: 519 / Nickname: charles / Registered: Feb, 2002

the remove method is a Container method from which
Panel, and JPanel inherit from:


remove

public void remove(Component?comp)

Removes the specified component from this container.

Parameters:
comp - the component to be removed

if your panel object is named controlArea as your code indicates, then try the following:

controlArea.remove(lampPanel);
controlArea.remove(kettlePanel);
con trolArea.remove(ovenPanel);
controlArea.remove(microwavePanel);

then

controlArea.validate();

validate() causes a container to lay out its subcomponents again after the components it contains have been added to or modified, i.e. in your case removed.

On your username and password validation line that looks like:

if (s.equals ("tange") && t.equals("100045713"))

change it to:

if ((s.compareTo("tange")==0) && (t.compareTo("100045713")==0))

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