Stream<Set<String>> -> flatMap -> Stream<String> Stream<List<String>> -> flatMap -> Stream<String> Stream<List<Object>> -> flatMap -> Stream<Object> How flatMap() works : { {1,2}, {3,4}, {5,6} } -> flatMap -> {1,2,3,4,5,6} { {'a','b'}, {'c','d'}, ...
public class ConvertListMapOfMapStringFlatMapExample3 { private enum Gender { male, female } public static void main(String[] args) { Map<Integer, Map<Gender, List<String>>> allStudentsGorupedByAgeAndThenGender = new HashMap<>(); HashMap<Gender, List<String>> studentsGroupedByGender = n...
packagecom.mkyong.java8.stream.flatmap;importjava.util.Arrays;importjava.util.stream.IntStream;importjava.util.stream.Stream;publicclassFlatMapExample4{publicstaticvoidmain(String[] args){int[] array = {1,2,3,4,5,6};//Stream<int[]>Stream<int[]> streamArray = Stream.of(array);//Stream<...
<R> Stream<R> flatMap(Function<? super T,? extends Stream<? extends R>> mapper)This intermediate operation returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each ...
3. Stream flatMap() Examples Example 1: Converting Nested Lists into a Single List Java 8 example ofStream.flatMap()function to get a singleListcontaining all elements from a list of lists. This program usesflatMap()operation to convertList<List<Integer>>toList<Integer>. ...
mapmethod is used to handle the element of stream and output the stream.flatMapmethod is used to handle multiple stream and output new stream. Here is some easy examples. 1. show all characters in List Every word in list will generate its own stream by invokingsplit("")method. In order...
* The {@code flatMap()} operation has the effect of applying a one-to-many * transformation to the elements of the stream, and then flattening the * resulting elements into a new stream. * * <p><b>Examples.</b> * * <p>If {@code orders} is a stream of purchase orders, and ...
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The difference between map() vs flatMap() with example. map() is used for transformation only, but flatMap() is used for both transformation and flattening.
本文是深入理解 Java 8 Lambda 系列的第二篇,主要介绍 Java 8 针对新增语言特性而新增的类库(例如 Streams API、Collectors 和并行)。 本文是对Brian Goetz的State of the Lambda: Libraries Edition一文的翻译。 Java SE 8 增加了新的语言特性(例如 lambda 表达式和默认方法),为此 Java SE 8 的类库也进行了很...