Get minvalue of a Map(Key,Double)

Question

Is there a method (maybe with Google Collections) to obtain the min value of a Map(Key, Double)?

In the traditional way, I would have to sort the map ac

Answer 1

You still can use Collections.min with a custom Comparator to get the Map.Entry with the lower value:

Map map = new HashMap();
map.put("1.1", 1.1);
map.put("0.1", 0.1);
map.put("2.1", 2.1);
Entry min = Collections.min(map.entrySet(), new Comparator>() {
    public int compare(Entry entry1, Entry entry2) {
        return entry1.getValue().compareTo(entry2.getValue());
    }
});
System.out.printf("%s: %f", min.getKey(), min.getValue()); // 0.1: 0.100000

With Java 8:

Entry min = Collections.min(map.entrySet(),
                                       Comparator.comparing(Entry::getValue));