Joptionpane can be used to get input options or display error msg or display
some msg as a info . the options are pretty simple and straight forward.

here's a example

JOptionPane.showMessageDialog( parent_panel_name,
msg,title,JOptionPane.INFORMATION_MESSAGE
);

just check Joptionpane api for different types of messages ....

I suggest you to read The Java Tutorial, which is provided free by Sun
Microsystems, This is the best one. I can explain you but there are many
functions in that, so a big problem for me.

U can go through the SwingSet2 Demo..
it's (SwingSet2.jar) inside your

<javadir>\demo\jfc\SwingSet2 directory

there u will find all the Swing components demo...
JOptionPane demo is also there (8th column) & every
demo is included with complete source code...