Java List Stream to Map using the Collectors toMap API : Java 8 Streams

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0:00 Introduction
1:30 Streaming List to HashMap
6:00 Handling Key Clashes Converting List to Map
10:45 Streaming List to a LinkedHashMap

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It was really helpful, thank you man, thanks for the good work

MuratKutluTuna

Thank you the tutorial Is so helpful and concise

okunnigasamson

Thanks a million for the tutorial!
However, the exception really got me baffled...
Normally when a duplicate key is put in a map, it doesn't throw one, simple overwriting takes place instead...
So, are there any other substantial differences between using a plain map and manipulating it in a stream?

OriginalLany

Hi, Shane thank you for the great explanation. Is there a way where I can apply a function on my list elements and store the list element and function return value in a key-value pair like a map?

Suppose I have a String List

List <String> Ids = [id1, ids2, id3];

and a Function

public List<String> getDays(String id) {
makes api call and fetch all the days in a list where id is present
return list;
}

Now I want to perform getDays function on each of the list elements of IDs and store it in a map

Map<String, List<String> where String would be my Id from List(IDs) and
List<String> would be the corresponding return value of getDays
function on each Id

I would really appreciate if you can help me here.

lalitverma

What’s the function.identify(), is it build in function in Java?

woonjeentang

Java List Stream to Map using the Collectors toMap API : Java 8 Streams

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