java - Create class object only if its parameter is not null -

i developing application in have 1 separate class socket related communication.in service class creating array of class object :

string ip1 = "192.168.1.19"; string ip2 = "192.168.1.51";  @override public void oncreate() {         roomstatus = new readroomstatus[] {        new readroomstatus(ip1),        new readroomstatus(ip2)      }; } 

and have loop read status :

for(i=0;i<roomstatus.length;i++) {            string status = roomstatus[i].readstatus();     log.v(tag, "status ::"+status);     broadcastroomstatus(i, status); }    

so loop iterate number of object array. here iterate 2 times.

i getting ip address shared preferences. if user doesn't set of ip class object should not created ip.

i.e if 1 ip set created class object should this

 roomstatus = new readroomstatus[] {new readroomstatus(ip1)}; 

if 2 ips set

 roomstatus = new readroomstatus[] {new readroomstatus(ip1),new readroomstatus(ip2}; 

so initial goal if of ip null object shouldn't initialize ip , loop should iterate no of times ips available.

how achieve this? if have other idea please suggest me. , advice appreciated.

thanks

update

readroomstatus roomstatus1=new readroomstatus(ip1);         readroomstatus roomstatus2=new readroomstatus(ip2);          aliststatus = new arraylist<readroomstatus>();         if(ip1!=""){             log.v(tag, "ip1 not null");             aliststatus.add(roomstatus1);         }                if(ip2!=""){             log.v(tag, "ip2 not null");             aliststatus.add(roomstatus2);         } 

don't use array. use arraylist, list of objects , who's size can changed @ time. loop through ip addresses, , if not null add() arraylist.