hashmap - How to Get All the Min Values from a Hash Map in Java -

i have hash map keys objects of type request , values of type integer. use following code iterate through map , minimum values , add keys list. emphasize because keys unique values can duplicate, therefore there may more 1 map elements minimum value.

however, code gives me single such element, is, first finds through iteration, though know there more. example, let map has following requests - i.e. keys (i give request ids): 3 | 5 | 2 , respective values are: 8 | 4 | 4. thus, @ example have 2 minimum elements, is, 2 elements share minimum value, id 5 , id 2, both value 4. code add list element id 5, is, first 1 of them.

i have note there similar thread (key maximum value in hashtable) provided solution not work in case.

here code:

 entry<request, integer> min = null;   list<request> minkeylist = new arraylist<request>();   for(entry<request, integer> entry : this.map.entryset()) {        if (min == null || min.getvalue() > map.getvalue()) {             min = entry;            minkeylist.add(entry.getkey());        } 

any suggestion or explanation why happenning appreciated.

edit: new approach

well, found solution. not elegant, works. here code.

    // list finding min value     list<integer> minvallist = new arraylist<integer>();      // list keeping keys of elements min value     list<request> minkeylist = new arraylist<request>();      // scan map , put values value list     for(entry<request, integer> entry : this.map.entryset()) {          minvallist.add(entry.getvalue());      }      // scan map        for(entry<request, integer> entry: this.map.entryset()) {          // find min value         if(entry.getvalue() == collections.min(minvallist)) {              // add keys of elements min value @ keylist             minkeylist.add(entry.getkey());         }      } 

i suggest two-step process:

1. find minimum, store in min
2. find elements value equal min

here code sample:

// find minimum first int min = integer.min_value; for(entry<request, integer> entry : this.map.entryset()) {     min = math.min(min, map.getvalue()) }  // add elements have value equal min list<request> minkeylist = new arraylist<request>(); for(entry<request, integer> entry : this.map.entryset()) {     if(min.getvalue() == min) {         minkeylist.add(entry.getkey());     } }