package stuaddquerysys;import java.awt.*;import javax.swing.UIManager;/**   * Title:				學生地址查詢系統程序   * Description:			教學示范   * Copyright:				Copyright (c) 2003   * Company:				北京師范大學計算機系   * @author				孫一林   * @version				1.0   */public class StuAddQuerySysApp {  private boolean packFrame = false;  public StuAddQuerySysApp() {    StuAddQuerySysFrame frame = new StuAddQuerySysFrame();    if (packFrame) {      frame.pack();    }    else {      frame.validate();    }    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);  }  public static void main(String[] args) {    try {      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());    }    catch(Exception e) {      e.printStackTrace();    }    new StuAddQuerySysApp();  }}