用JAVA开发的多用户聊天室希望能通过

				/***************************************************
				*  程序文件名称：　Chat.java
				*  功能：多用户聊天室的客户端程序（主程序），
				*        构造和设置应用程序窗体。
				***************************************************/
				import java.awt.BorderLayout; 
				import java.awt.*; 
				import javax.swing.*; 
				import java.awt.event.*; 
				
				public class Chat 
				{
				  boolean packFrame = false; 
				  /** 
				  * 构造函数，显示应用程序的窗体. 
				  */ 
				  public Chat() { 
				  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(); 
				    } 
				  // 使窗体在屏幕居中显示
				  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); 
				  } 
				
				  /** 
				  *主函数，应用程序的入口. 
				  */ 
				  public static void main(String[] args) { 
				   SwingUtilities.invokeLater(new Runnable() { 
				    public void run() { 
				     try { 
				        UIManager.setLookAndFeel(UIManager. 
				        getSystemLookAndFeelClassName()); 
				      } 
				      catch (Exception exception)  
				        {  exception.printStackTrace();  }
				    new Chat(); 
				    }  //  run() end
				   }); // invokeLater()方法 end
				  } 
				  
				}