I have a large map with different keys and several values (DepthFeed) associated to each. I would like to get any value (DepthFeed) from that to be able to extract the name of the instrument one for each key.
I have this map
private static Map<Integer, List<DepthFeed>> mapDepthFeed = new HashMap<>();
From that I would like to do something like, however not returning the keyset integer. Instead I want a List<DepthFeed> back (containing one row for each key)
List<DepthFeed> d = mapPriceFeed.values().stream().distinct().collect(Collectors.toList());
Use
List<DepthFeed> result = mapDepthFeed.values().stream()
.filter(list -> !list.isEmpty())
.map(list -> list.get(0))
.collect(Collectors.toList());
This way you will get the first element from each non-empty list stored in map values.
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