userlist.java

jsp聊天室源码

package listen;
import java.io.*;
import java.util.*;
public class UserList
{
  private Vector container;
  private static UserList instance=new UserList();
  private UserList()
  {
    container=new Vector();	
  }	
  public static UserList getInstance()
  {
    return instance;	
  }
  public void addUser(String user)
  {
    if(user!=null)
    {
      container.add(user);
      System.out.println(user);
    }	
  }
  public int getSize()
  {
    if(container==null)
      return 0;
    else
       return container.size();	
  }
  public Enumeration getList()
  {
    System.out.println("列表");
    return container.elements();	
  }
  public void removeUser(String user)
  {
   if(user!=null)
   {
     container.removeElement(user);	
   }	
  }
}