java background prompt pop-up box

. 1  public  static  void main (String [] args) {
 2  　　// without icons 
. 3  　　Toolkit.getDefaultToolkit () BEEP ();.
 . 4  　　JOptionPane.showMessageDialog ( null , "information", "heading" , JOptionPane.PLAIN_MESSAGE);
 . 5  　　// band? Icon 
6  　　JOptionPane.showMessageDialog ( null , "information", "title" , JOptionPane.QUESTION_MESSAGE);
 7  　　// with a warning icon 
8  　　JOptionPane.showMessageDialog ( null , "information", "title" , JOptionPane.WARNING_MESSAGE);
 9　　 // with warning icon 
10 　　JOptionPane.showMessageDialog ( null , "information", "heading" , JOptionPane.INFORMATION_MESSAGE);
 . 11  　　// with an error icon 
12 is  　　JOptionPane.showMessageDialog ( null , "information", "heading" , JOptionPane.ERROR_MESSAGE);
 13 is }