Java开发的操作系统实验

				package OS;
				
				import java.awt.Toolkit;
				import javax.swing.SwingUtilities;
				import javax.swing.UIManager;
				import java.awt.Dimension;
				
				/**
				 * Title: 
				 *
				 * Description: 
				 *
				 * Copyright: Copyright (c) 2008
				 *
				 * Company: 
				 *
				 * @author not attributable
				 * @version 1.0
				 */
				public class Privilege {
				  boolean packFrame = false;
				
				  /**
				   * Construct and show the application.
				   */
				  public Privilege() {
				    Frame1 frame = new Frame1();
				    // Validate frames that have preset sizes
				    // Pack frames that have useful preferred size info, e.g. from their layout
				    if (packFrame) {
				      frame.pack();
				    }
				    else {
				      frame.validate();
				    }
				
				    // Center the window
				    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
				    Dimension frameSize = frame.getSize();
				    if (frameSize.height > screenSize.height) {
				      frameSize.height = screenSize.height;
				    }
				    if (frameSize.width > screenSize.width) {
				      frameSize.width = screenSize.width;
				    }
				    frame.setLocation( (screenSize.width - frameSize.width) / 2,
				                      (screenSize.height - frameSize.height) / 2);
				    frame.setVisible(true);
				  }
				
				  /**
				   * Application entry point.
				   *
				   * @param args String[]
				   */
				  public static void main(String[] args) {
				    SwingUtilities.invokeLater(new Runnable() {
				
				      public void run() {
				        try {
				          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
				        }
				        catch (Exception exception) {
				          exception.printStackTrace();
				        }
				        new Privilege();
				      }
				    });
				
				  }
				}