package chat;import javax.swing.UIManager;import java.awt.*;/** * <p>Title: 使用JAVA制作的局域網聊天程序</p> * <p>Description: 我們的JAVA作業</p> * <p>Copyright: Copyright (c) 2002</p> * <p>Company: </p> * @author RoadAhead * @version 1.0 */public class chatmain{  private boolean packFrame = false;  //Construct the application  public chatmain()  {    mainform frame = new mainform();    //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);  }  //Main method  public static void main(String[] args)  {    try    {      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());    }    catch(Exception e)    {      e.printStackTrace();    }    new chatmain();  }}