main.java

以一个酒店的进销存系统为例

package com.csbook.restaurant;

import javax.swing.UIManager;
import java.awt.*;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author pengtao
 * @version 1.0
 */

public class Main {
  boolean packFrame = false;
  private LoginSystem loginSys=null;
 //Construct the application
 public Main() {
   loginSys = new LoginSystem();
   //Validate frames that have preset sizes
   //Pack frames that have useful preferred size info, e.g. from their layout
   if (packFrame) {
     loginSys.pack();
   }
   else {
     loginSys.validate();
   }
   //Center the window
   Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
   Dimension frameSize = loginSys.getSize();
   if (frameSize.height > screenSize.height) {
     frameSize.height = screenSize.height;
   }
   if (frameSize.width > screenSize.width) {
     frameSize.width = screenSize.width;
   }
   loginSys.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
   loginSys.setVisible(true);
 }

 public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Main();
  }
}