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Oct 22nd, 2005

Buttons problem

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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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jeni_4

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Newbie Poster

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Oct 22nd, 2005

Re: Buttons problem

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:

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);
       }
}

server_crash

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Postaholic

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Oct 24th, 2005

Re: Buttons problem

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.

Gargol

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Oct 24th, 2005

Re: Buttons problem

Quote 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:

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.

server_crash

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Postaholic

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Oct 24th, 2005

Re: Buttons problem

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

jeni_4

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Oct 25th, 2005

Re: Buttons problem

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...

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...

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

hooknc

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