package simplechatserver;import java.io.*;/** * Title:        網絡聊天程序的服務器端 * Description: * Copyright:    Copyright (c) 2001 * Company: * @author * @version 1.0 */public class Sender {  private PrintStream outStream;  public Sender(OutputStream out) {     outStream=new PrintStream(out);  }  public synchronized boolean send(String msg){     try{         outStream.println(msg);     }catch(Exception e){        return false;     }     return true;  }}