Solution for Reversing a Map in Java

[GKKB]

No description provided.

[pmavinkurve-mdsol]

Hi @GKKB - thanks for the solution. I checked through the imperative section and it looks good! But i am not familiar with the declarative style. I put this code in an online Java compiler and it gives an error with JDK 9. I get the same error locally on my mac, but i thought it could be because i am running Java 1.8

These are the compiler errors:

        inputMap.forEach((key,value) -> outputMap.merge(value, List.of(key), ReverseAMap::mergeListsOfValues));
                                                                   ^
  symbol:   method of(String)
  location: interface List
/ReverseAMap.java:66: error: cannot find symbol
        Map<String,String> map = Map.of("a","1", "b","2", "c", "1", "d", "3", "as", "3");   // Java 9
                                    ^
  symbol:   method of(String,String,String,String,String,String,String,String,String,String)
  location: interface Map
2 errors

I used https://www.jdoodle.com/online-java-compiler
Could you look into the errors when you get a chance?
Thanks.