MapToList2

Code from DZone on Converting Java Maps to Lists

Many thanks to John Thompson, Spring Framework Guru https://springframework.guru

See DZone article: https://dzone.com/articles/converting-java-maps-to-lists

The MapToListConverter contains:

1. code to convert all the keys of a Map to a Set

2. code to convert Map values to a List

3. code using streams (introduced in Java 8), along with some utility classes like Collectors to convert a stream of Map entries to List.

Note: The variable listOfKeys2 has been changed to listOfKeys to correct compile error

public List<Integer> convertMapKeysToListWithStream(Map<Integer,String> map){
    List<Integer> listOfKeys = map.keySet().stream().collect(Collectors.toList());
    return listOfKeys;
}