java - looping Nested If else in a TreeMap logic -

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i'm putting values in treemap follows:

  if (hdr.getname().equalsignorecase("ip4")) {      map.put(1, f);  } else if (hdr.getname().equalsignorecase("ethernet")) {      map.put(2, f);  } else if (hdr.getname().equalsignorecase("tcp")) {      map.put(3, f);  } else  if (hdr.getname().equalsignorecase("udp")) {      map.put(4, f);  }

and i'm trying retrieve using:

iterator < map.entry < integer, field >> entries = map2.entryset().iterator(); while (entries.hasnext()) {      map.entry < integer, field > entry = entries.next();      if ((entry.getkey() == 1)) {      stringbuilder.append(entry.getvalue().getsource());     stringbuilder.append(",");     stringbuilder.append(entry.getvalue().getdestination());     } else if ((entry.getkey() == 2)) {      stringbuilder.append(entry.getvalue().getsource());     stringbuilder.append(",");     stringbuilder.append(entry.getvalue().getdestination());     } else if ((entry.getkey() == 3)) {      stringbuilder.append(entry.getvalue().getsource());     stringbuilder.append(",");     stringbuilder.append(entry.getvalue().getdestination());     } else if ((entry.getkey() == 4)) {      stringbuilder.append(entry.getvalue().getsource());     stringbuilder.append(",");     stringbuilder.append(entry.getvalue().getdestination());     }  }

now, output want if key not found, should go in else part (which have not included here not getting desired output) , should append 

               stringbuilder.append(,,);

for example 

        if key 1 contains 12,13         if key 2 not present ,,         if key 3 contains 10,11         if key 4 contains 14,15

so desired outout should 

       12,13,,10,11,14,15

kindly me logic breaking head on this.

thanks

thanks hint david , solved using

    (int i=1 ; i<=map2.size()+1; i++){         if(map2.containskey(i))         {             //appendstring(map2.get(i));                  stringbuilder.append(map2.get(i).getsource());             stringbuilder.append(",");             stringbuilder.append(map2.get(i).getdestination());          }         else{             stringbuilder.append(",,");         }      }

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