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import java.util.*;
import java.util.Enumeration;
public class UserList {
private static final UserList userList=new UserList();
private Vector<String> vec;
private UserList()
{
vec=new Vector<String>();
}
public static UserList getInstance()
{
return userList;
}
public void addUser(String name)
{
if(name!=null)
vec.addElement(name);
}
public void removeUser(String name)
{
if(name!=null)
vec.remove(name);
}
public Enumeration<String> getUserList()
{
return vec.elements();
}
public int getUserCount()
{
return vec.size();
}
}
import java.util.Enumeration;
public class helloword {
public static void main(String[] args )
{
UserList ul=UserList.getInstance();
System.out.println("当前在线用户:");
ul.addUser("AA");
ul.addUser("BB");
System.out.println(ul.getUserCount());
Enumeration<String> enums=ul.getUserList();
int i=0;
System.out.println(enums.hasMoreElements());
// System.out.println(enums.nextElement());
// System.out.println(enums.hasMoreElements());
// System.out.println(enums.nextElement());
// System.out.println(enums.hasMoreElements());
// System.out.println(enums.nextElement());
while(enums.hasMoreElements());
{
String v=(String)enums.nextElement();
System.out.println(v);
}
}
}