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...
1.2 In above example, we should use flatMap() to convert Stream<String[]> to Stream<String>. TestExample1.java package com.mkyong.java8; import java.util.Arrays; import java.util.stream.Stream; public class TestExample1 { public static void main(String[] args) { String[][] data = ne...
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...
或者我们可以使用flatMap将二维数组展平为以为数组,从而将Stream<String[]>转化为Stream。 代码语言:javascript 复制 String[][]array=newString[][]{{"a","b"},{"c","d"},{"e","f"}};// Java 8String[]result=Stream.of(array)// Stream<String[]>.flatMap(Stream::of)// Stream<String>.toA...
Java 8 example ofStream.flatMap()function to get a singleListcontaining all elements from an array of arrays. Merging Arrays into a Single List String[][]dataArray=newString[][]{{"a","b"},{"c","d"},{"e","f"},{"g","h"}};List<String>listOfAllChars=Arrays.stream(dataArray)....
http://www.concretepage.com/java/jdk-8/java-8-flatmap-example Example of map() public static void main(String[] args) { Map<Integer, String> map = new HashMap<>(); map.put(111, "Lalkrishna"); map.put(154, "Atal"); map.put(30, "Narendra"); ...
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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) );...
Following example will help you to understand thisflatMapand a possible example scenario. Let us consider a zoo and the list of animals in it. Then we can use theflatMapto get an aggregate of animals in a list of Zoo. If we use the Pre-Java8 approach, we would be doing this by us...
8. In the second example, a Stream of List is passed.在第二个示例中,将传递列表流。It is NOT a Stream of Integer!它不是整数流! If a transformation Function has to be used (through map), then first the Stream has to be flattened to something else (a Stream of Integer).如果必须使用...