Java multiple devices, locking sequencing

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4 Android devices need to be locked in order, the next time in order to push the socket data to these 4 different content. When a new machine is added, such as e, it is inserted into the place where the original position is C. The specific code is as follows:

 Public StaticArraylist<deviceloginentity> Setdeviceorder (arraylist<deviceloginentity>devices,string Orderstr) {        if(Stringutil.isnullorempty (ORDERSTR) | | devices = =NULL|| Devices.size () <= 0) {LOG.V ("Deviceutil", "if (Stringutil.isnullorempty (orderstr) | | | devices = = NULL | | Devices.size () > 0) return directly to Devices "); returndevices; }        Else{LOG.V ("Setdeviceorder", "orderstr=" +orderstr); String[] Orderstrarr= Orderstr.split ("\\|"); //priority will exist in the devices,             for(inti=0;i<orderstrarr.length;i++)            {                 for(intJ=0;j<devices.size (); j + +)                {                    if(Orderstrarr[i].equals (Devices.get (j). android_id)) {Devices.get (j). SN=i; }                }            }            //will be involved in Devices.get (j). sn= default value of 100 is set to not in {1,2,3,4} condition            intFlag =-1;  for(intI=0;i<devices.size (); i++)            {                intj = 0;  for(J=0;j<devices.size (); j + +)                {                    if(Devices.get (j). sn = =i) { Break;} }                if(j = = Devices.size ())//Description not found{flag=i;  Break; }            }             for(intI=0;i<devices.size (); i++)            {                if(Devices.get (i). sn = = && Flag!=-1)                {                    //then the SN is set to Devices.get (i). SN non-existent numberDevices.get (i). sn =Flag; }            }            //then the devices SN is sorted, the smaller the more in frontComparator<deviceloginentity> Comparator =NewComparator<deviceloginentity>(){                       Public intCompare (deviceloginentity s1, deviceloginentity S2) {if(S1.sn <s2.sn) {                            return-1; }                          Else                            return1;              }                  }; Collections.sort (Devices, comparator);//Sort by attribute Sn, from small to large//For (deviceloginentity en:devices)//            {//log.e ("Setdeviceorder", "deviceloginentity=" +en.android_id+ "; sn=" +en.sn);//            }            returndevices; }    }

Java multiple devices, locking sequencing