Let’s also see an example of flatMapToInt . In the below example we have a primitiveinttype array. And we would like to have a sum of all the integers within the array. So we would use flatMapToInt to getIntStreamand use the sum operation ofIntStream. Java public class FlatMapto...
1. Stream + String[] + flatMap 1.1 The below example will print an empty result, because filter() has no idea how to filter a stream of String[]. TestExample1.java package com.mkyong.java8; import java.util.Arrays; import java.util.stream.Stream; public class TestExample1 { public s...
String userDetailsUrl = "my-api/users/details/"; // needs the id at the end // Example with map Mono<Mono<JsonObject>> result = HttpClient.get(firstUserUrl). map(user -> HttpClient.get(userDetailsUrl + user.getId())); // This results with a Mono<Mono<...>> because HttpClient.get...
2. show all pairs of two arrays In order to show all possible pairs we need handle every item of numbers2 in the stream of number1. There are multiple stream when invokenumber2.stream()method. So we needflatMapto handle multiple stream and put the result in a new stream. List<Integer...
Developer.java 代码语言:javascript 复制 importjava.util.HashSet;importjava.util.Set;publicclassDeveloper{privateInteger id;privateString name;privateSet<String>book;//getters, setters, toStringpublicvoidaddBook(String book){if(this.book==null){this.book=newHashSet<>();}this.book.add(book);}} ...
Nothing special in the first example, aFunctionis applied to return theStringin uppercase.在第一个示例中没有什么特别的,应用了一个Function以大写形式返回String。 Second example making usage offlatMap:第二个示例使用flatMap: @Test public void testflatMap() throws Exception { ...
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Java8flatMapexample Java8flatMapexample InJava8, Stream can hold different data types, for examples: Stream<String[]> Stream<Set<String>> Stream<List<String>> Stream Java编程 java python ide spring 转载 mb5fed716b639b4 2018-11-26 18:14:00 ...
For example, we may write a program to find all district words from all lines in a text file. The following example: Reads a text file usingFiles.lines()to obtain a stream of lines. TheflatMap()operation transforms each line into a new Stream of words. This is the one-to-many transf...
import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class StreamExample { public static void main(String[] args) { List<List<Integer>> nestedList = Arrays.asList( Arrays.asList(1, 2, 3), Arrays.asList(4, 5, 6), Arrays.asList(7, 8, 9) );...