Java 8: Transform EnumMap<ExampleEnum, String> to Map<String, Object>

Question

I have a situation where I need to copy my EnumMap<ExampleEnum,String> to Map<String, Object>. Many examples on Stack Overflow shows how to cast from one data type to another but not from enum. I have tried doing it through stream but no luck. Here is my code

private enum Number{
  One, Two, Three;
}
final Map<Number, String> map = Collections.synchronizedMap(new EnumMap<Number, String> (Number.class));

populateMap(map);
Map<String, Object> newMap= new HashMap<String, Object>();

Now I want to do something like

newMap.putAll(map);

How can I do it through Stream APIs?

What data should result map hold? I am guessing that String should be name of enum, but what should be held under Object value? — Pshemo
– Pshemo, Commented Jun 26, 2018 at 14:35

Eric · Accepted Answer · 2018-06-26 14:41:01Z

2

A more concise answer is,

final Map<Number, String> map = Collections.synchronizedMap(new EnumMap<>(Number.class));

Map<String, Object> newMap= new HashMap<>();

map.forEach((key, value) -> newMap.put(key.name(), value));

answered Jun 26, 2018 at 14:41

Eric

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1 Comment

J D Over a year ago

Perfect. Thank You :)

Youcef LAIDANI · Accepted Answer · 2018-06-26 14:53:55Z

2

Map<String, Object> newMap = map.entrySet().stream()
        .collect(Collectors.toMap(e -> e.getKey().toString(),  Map.Entry::getValue));

edited Jun 26, 2018 at 14:53

Youcef LAIDANI

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answered Jun 26, 2018 at 14:39

gagan singh

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1 Comment

J D Over a year ago

Works like a charm. Thank you :)

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