class Session {
        public String clientId;
        public String userId;
        public int platform;
        public int status; //0 online, 1 have session offline
        public long lastSeen;
        public String packageName;

        public Session() {
        }

        public Session(String clientId, String userId, int platform, int status, long lastSeen, String packageName) {
            this.clientId = clientId;
            this.userId = userId;
            this.platform = platform;
            this.status = status;
            this.lastSeen = lastSeen;
            this.packageName = packageName;
        }
    }

    public void addSession(String userId, String clientId, int platform, int status, long lastSeen, String packageName) {<FILL_FUNCTION_BODY>

        Session session = new Session(clientId, userId, platform, status, lastSeen, packageName);
        sessions.add(session);
    
<no_super_class>