displayadialog.java

《A first book of java》by Gary J.Bronson 北大出版社

// File: DisplayADialog.java
// Description: Construction of a dialog
// Programmer: G. Bronson
// Date: 6/15/01
import javax.swing.*; 
public DisplayADialog
{
  public static void main (String[] args) 
  {
    JOptionPane.showMessageDialog(null,"Hello World!",
           "Sample",JOptionPane.WARNING_MESSAGE);
    System.exit(0);
 }
}