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Buttons problem

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Join Date: Oct 2005

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jeni_4

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Buttons problem

Oct 22nd, 2005

I have a JFrame , and to one of its button 'done', I wish to add an ability to close the window...ie on clicking done this window should close.

jen

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Join Date: Jun 2004

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server_crash server_crash is offline

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Re: Buttons problem

Oct 22nd, 2005

Since your using swing it's easy:

In the action performed method, just check which button was clicked and then add this line of code:

System.exit(0);

for example:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public void actionPerformed(ActionEvent ae)
{
       if (ae.getSource() == doneButton)
       {
               System.exit(0);
       }
}
public void actionPerformed(ActionEvent ae)
{
       if (ae.getSource() == doneButton)
       {
               System.exit(0);
       }
}

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Join Date: Oct 2005

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Gargol

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Re: Buttons problem

Oct 24th, 2005

jeni

Remember that java matches on object references so the reference to doneButton should be the name you gave to the button object when you made it.

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Join Date: Jun 2004

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server_crash server_crash is offline

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Re: Buttons problem

Oct 24th, 2005

•

Originally Posted by Gargol

jeni

Remember that java matches on object references so the reference to doneButton should be the name you gave to the button object when you made it.

Not really. There are two ways of doing this:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
JButton doneButton = new JButton("Done");
 
 
if (ae.getSource() == doneButton)
{
}
 
 
or 
 
if (ae.getActionCommand().equals("Done"))
{
}
JButton doneButton = new JButton("Done");


if (ae.getSource() == doneButton)
{
}


or 

if (ae.getActionCommand().equals("Done"))
{
}

You can compare the actual object itself, or the name of it.

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Join Date: Oct 2005

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jeni_4

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Newbie Poster

Re: Buttons problem

Oct 24th, 2005

Well!! Thanks every one for their reply.

I has actually tried system.exit(0), but that closes the complete application. However looking through the API I realised that I could use dispose()..i tried that and it works fine.

Thanks every one once again

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hooknc

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Posting Whiz in Training

Re: Buttons problem

Oct 25th, 2005

I personally like making a button a listener of itself instead of having if statements determining what is suppose to happen when a specific button is pressed...

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public class ExtendedJButton extends JButton implements ActionListener
{
	public ExtendedJButton()
	{
		init();
	}
 
	private void init()
	{
		addActionListener(this);
	}
 
	public void actionPerformed(ActionEvent event)
	{
		System.out.println("Override this method with an anonymous inner clas");
	}
}
public class ExtendedJButton extends JButton implements ActionListener
{
	public ExtendedJButton()
	{
		init();
	}
	
	private void init()
	{
		addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent event)
	{
		System.out.println("Override this method with an anonymous inner clas");
	}
}

Then to use this class do the following when creating the button...

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
JButton jButton = new ExtendedJButton()
{
  public void actionPerformed(ActionEvent event)
  {
    System.out.println("I'm suppose to do something exciting here...");
  }
};
JButton jButton = new ExtendedJButton()
{
  public void actionPerformed(ActionEvent event)
  {
    System.out.println("I'm suppose to do something exciting here...");
  }
};

Some people might say that this is over kill, but i think a button should know what it is suppose to do and what if a panel has over a hundered buttons on it? Do you really want to have a 100 case if statement?

Regards,

Nate