HashMap can keep always the same order? [duplicate]

Question

I want to know if my HashMap collection will be always on the same order

        Map<Integer, Long> map = new HashMap<Integer, Long>(0);

        for(Integer key : users) {
            map.put( key , (long) 0 );
        }

        for( ... ){
            ...
            if( ... ) ){
                map.put( t.get(key) , map.get(key) + 1);
            }
        }

I send this collection to javascript with ajax

                    $.each( jsonData[i].totalMap , function(key, value) {
                        rows.push(value);
                    });

will have always the same order of the element of the Map as i put them in my controller ?

Answer 1

If you use a LinkedHashMap, the order will be kept (i.e., by default, the keys will always be iterated in the same order they were inserted into the Map).

Answer 2

If the keys and values are always the same, the map size is the same, and the HashMap is initialized in the same way, then yes. However for guaranteed iteration order, use a LinkedHashMap.