/*
?*?Created?on?2004-10-21
?*
?*?TODO?To?change?the?template?for?this?generated?file?go?to
?*?Window?-?Preferences?-?Java?-?Code?style?-?Code?Templates
?*/
package?com.test;

/**
?*?@author?Administrator
?*?
?*?TODO?To?change?the?template?for?this?generated?type?comment?go?to?Window?-
?*?Preferences?-?Java?-?Code?style?-?Code?Templates
?*/
import?java.util.List;
import?java.util.ArrayList;

public?class?OnlineCounter?{
	private?static??final?List?list?=?new?ArrayList（）;

	private?OnlineCounter（）?{
	}
	public?static?void?addUser（String?username）?{
		if（（username.length（）>2）?&&?!list.contains（username））{
			System.out.println（“addUser“）;
			list.add（username）;
		}
	}
	public?static?void?removeUser（String?username）{
????????System.out.println（username）;
		if（（username!=null）?&&?list.contains（username））{
			list.remove（username）;
			System.out.println（“removeUser“）;
		}
		
	}
	public?static?int?getOnlineCount（）?{
		//返回當(dāng)前在線(xiàn)人數(shù)
		return?list.size（）;
	}

	public?static?List?getOnline（）?{
		return?list;
	}
}