public boolean addUser(ClientDB client) {
		// TODO Auto-generated method stub
		if (checkSpace()) {
			if (checkDuplicate(client.getUserID())) {
				for (int i = 0; i < clientObj.length; i++) {
					if(clientObj[i]==null){
						clientObj[i]=client;
						return true;
					}
				}
			}
			else{
				return false;
			}
		}
		else{
			return false;
		}
		
			return false;
				
	}