Java 8 List To Map

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Java 8 List To Map

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10 examples of converting a list to map in java 8

10 Examples Of Converting A List To Map In Java 8

WEB May 26 2017 nbsp 0183 32 Few Java 8 examples to show you how to convert a List of objects into a Map and how to handle the duplicated keys It's easy to convert List<V> into Map<K, List<V>>. For example: public Map<Integer, List<String>> getMap(List<String> strings) { return strings.stream() .collect(Collectors.groupingBy(String::length)); } But I want to do it with my own List and Map suppliers. I have come up with this:

java 8 list to map examples on how to convert list to map in java 8

Java 8 List To Map Examples On How To Convert List To Map In Java 8

Java 8 List To MapI want to translate a List of objects into a Map using Java 8's streams and lambdas. This is how I would write it in Java 7 and below. private Map<String, Choice> nameMap(List<Choice> WEB List lt Item gt list Map lt Key Item gt map new HashMap lt Key Item gt list size for Item i list map put i getKey i Assuming of course that each Item has a getKey method that returns a key of the proper type