|
| | Here's an example of how you can create a message dialog:
package swingExamples;
import javax.swing.JOptionPane;
public class SimpleMessage1
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(
null, // The parent frame
"You are hereby informed of an important fact."
// A message
);
}
}
|
which produces the following:
Note that there are three obvious components of this dialog:
- The message
- An icon to the left of the message, indicating what kind of message it
is (Informational, Warning, Error, etc.)
- The OK button.
If we modify this simple example a little:
package swingExamples;
import javax.swing.JOptionPane;
public class SimpleMessage2
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(
null, // The parent frame
"You are hereby informed of an error.",
// a message
"Error", // a title
JOptionPane.ERROR_MESSAGE
// The message type
);
}
}
|
The result looks like this:
Note two things:
- The titlebar shows the specified title
- The icon has changed to indicate that an error is indicated.
If we wanted to show a warning:
package swingExamples;
import javax.swing.JOptionPane;
public class SimpleMessage3
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(
null, // The parent frame
"You are hereby warned.",
// a message
"Warning", // a title
JOptionPane.WARNING_MESSAGE
// Warning type
);
}
}
|
it would look like this:
You also have the option of not showing an icon:
package swingExamples;
import javax.swing.JOptionPane;
public class SimpleMessage4
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(
null, // The parent frame
"This is a pretty plain message.",
// a message
"Plain Message", // a title
JOptionPane.PLAIN_MESSAGE
// Plain type
);
}
}
|
which looks like:
You can also ask a question:
package swingExamples;
import javax.swing.JOptionPane;
public class SimpleMessage5
{
public static void main(String[] args)
{
JOptionPane.showMessageDialog(
null, // The parent frame
"Are you sure you want to do this?",
// a message
"Just checking...", // a title
JOptionPane.QUESTION_MESSAGE
// Question type
);
}
}
|
which looks like this:
Of course, when the only option is OK, it's not terribly useful!
That's where Confirm Dialogs come in...
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