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...
import java.util.stream.Collectors; import java.util.stream.Stream; public class FlatMapExample { public static void main(String[] args) { List<String> list = Arrays.asList("Java", "Python", "C++"); List<String> flatMapList = list.stream() .flatMap(Stream::of) .collect(Collectors.to...
import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; import java.util.stream.Stream; public class FlatMapExample { public static void main(String[] args) { List<String> input = Arrays.asList("1", "2", "three", "4", "five"); try { List<Integer> resu...
public class ConvertListMapStringFlatMapExample2 { public static void main(String[] args) { Map<String, List<String>> languageNames = new HashMap<>(); languageNames.put("frontend", Arrays.asList("Javascript", "HTML", "CSS")); languageNames.put("backend", Arrays.asList("Simula", "Jav...
import java.util.Arrays; import java.util.List; import java.util.stream.Collectors; public class FlatMapExample { public static void main(String[] args) { List<String> words = Arrays.asList("Hello", "World"); List<String> characters = words.stream() .flatMap(word -> Arrays.stream(word...
importjava.util.Arrays;importjava.util.List;importjava.util.stream.Collectors;importjava.util.stream.Stream;publicclassFlatMapExample{publicstaticvoidmain(String[] args){List<Integer> list1 =Arrays.asList(1,2,3);List<Integer> list2 =Arrays.asList(4,5,6);List<Integer> list3 =Arrays.asList(...
{returnaddresses;}}publicclassFlatMapExample{publicstaticvoidmain(String[]args){List<User>users=Arrays.asList(newUser("Alice",Arrays.asList(newAddress("Street A"),newAddress("Street B"))),newUser("Bob",Arrays.asList(newAddress("Street C"))),newUser("Charlie",Arrays.asList(newAddress("...
{returncourses;}}publicclassFlatMapExample{publicstaticvoidmain(String[]args){List<Student>students=newArrayList<>();students.add(newStudent("Alice"));students.add(newStudent("Bob"));students.add(newStudent("Charlie"));students.get(0).addCourse("Math");students.get(0).addCourse("English");...
importjava.util.ArrayList;importjava.util.Arrays;importjava.util.List;importjava.util.stream.Collectors;importjava.util.stream.Stream;publicclassFlatMapExample{publicstaticvoidmain(String[] args){// 创建一个包含多个列表的列表List<List<String>> nestedList =Arrays.asList(Arrays.asList("A","B"),Arr...
// Same example with flatMap Mono<JsonObject> bestResult = HttpClient.get(firstUserUrl). flatMap(user -> HttpClient.get(userDetailsUrl + user.getId())); // Now the result has the type we expected 2.3 返回 map() 返回一个值的流