Showing a Dialog Box

 
 // Modal dialog with OK button.
 JOptionPane.showMessageDialog(frame, "Line1\nLine2");
     
 // Modal dialog with yes/no button.
 int answer = JOptionPane.showConfirmDialog(
   frame, "Line1\nLine2");
 if (answer == JOptionPane.YES_OPTION) {
     // User clicked YES.
 } else if (answer == JOptionPane.NO_OPTION) {
     // User clicked NO.
 }
     
 // Modal dialog with OK/cancel and a text field
 String text = JOptionPane.showInputDialog(
   frame, "Line1\nLine2");
 if (text == null) {
     // User clicked cancel
 } else {
     process(text);
 }