问可以按值的顺序迭代的映射。

EN

Ordering<Map.Entry<Key, Value>> entryOrdering = Ordering.from(valueComparator)
  .onResultOf(new Function<Entry<Key, Value>, Value>() {
    public Value apply(Entry<Key, Value> entry) {
      return entry.getValue();
    }
  }).reverse();
// Desired entries in desired order.  Put them in an ImmutableMap in this order.
ImmutableMap.Builder<Key, Value> builder = ImmutableMap.builder();
for (Entry<Key, Value> entry : 
    entryOrdering.sortedCopy(map.entrySet())) {
  builder.put(entry.getKey(), entry.getValue());
}
return builder.build();
// ImmutableMap iterates over the entries in the desired order

Ordering.natural().reverse().nullsLast().onResultOf(Functions.forMap(map, null))

Ordering.fromComparator(yourComparator).reverse().nullsLast().onResultOf(Functions.forMap(map, null))

final Map<String, String> map = ImmutableMap.of(
    "key 1", "value 1",
    "key 2", "value 2",
    "key 3", "another value",
    "key 4", "zero value");

final Ordering<String> naturalReverseValueOrdering =
    Ordering.natural().reverse().nullsLast().onResultOf(Functions.forMap(map, null));

System.out.println(ImmutableSortedMap.copyOf(map, naturalReverseValueOrdering));

{key 4=zero value, key 2=value 2, key 1=value 1, key 3=another value}

final Map<String, String> map = ImmutableMap.of(
    "key 1", "value 1",
    "key 2", "value 2",
    "key 3", "zero value",
    "key 4", "zero value");

final Ordering<String> reverseValuesAndNaturalKeysOrdering =
    Ordering.natural().reverse().nullsLast().onResultOf(Functions.forMap(map, null)) // natural for values
        .compound(Ordering.natural()); // secondary - natural ordering of keys

System.out.println(ImmutableSortedMap.copyOf(map, reverseValuesAndNaturalKeysOrdering));

{key 3=zero value, key 4=zero value, key 2=value 2, key 1=value 1}

map.entrySet().stream()
    .sorted(Comparator.comparing(Map.Entry::getValue))
    .forEach(...);