How to convert Map to Map ? (option : using guava)

Question

I have a Map the String key is nothing but numeric value like \"123\" etc. I\'m getting numeric value because this values are

Answer 1

Here's an updated version of one of the answers below to make the resulting Map unmodifiable (no, it's not using Guava, just plain Java 8):

  import static java.util.stream.Collectors.collectingAndThen;
  import static java.util.stream.Collectors.toMap;

  ...

  newMap = oldMap.entrySet().stream().collect(collectingAndThen(
              toMap((Map.Entry entry) -> transformKey(entry.getKey()),
                    (Map.Entry entry) -> transformValue(entry.getValue())),
              Collections::unmodifiableMap)));