‘flatMap’ method 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 element. Each mapped stream is closed after its contents have been placed into this stream.
Signature
Example
Integer[] primeNumbers = { 2, 3, 5, 7 };
Integer[] evenNumbers = { 2, 4, 6, 8 };
Integer[] oddNumbers = { 1, 3, 5, 7 };
Integer[][] allTypeOfNumbers = { primeNumbers, evenNumbers, oddNumbers };
Stream allNumbers = Arrays.stream(allTypeOfNumbers);
Stream intStream = allNumbers.flatMap(arr -> Arrays.stream(arr));
App.java
package com.sample.app;
import java.util.Arrays;
import java.util.stream.Stream;
public class App {
public static void main(String args[]) {
Integer[] primeNumbers = { 2, 3, 5, 7 };
Integer[] evenNumbers = { 2, 4, 6, 8 };
Integer[] oddNumbers = { 1, 3, 5, 7 };
Integer[][] allTypeOfNumbers = { primeNumbers, evenNumbers, oddNumbers };
Stream allNumbers = Arrays.stream(allTypeOfNumbers);
Stream intStream = allNumbers.flatMap(arr -> Arrays.stream(arr));
intStream.forEach(ele -> System.out.print(ele + ", "));
}
}
Output
2, 3, 5, 7, 2, 4, 6, 8, 1, 3, 5, 7,
Related Articles
This post first appeared on Java Tutorial : Blog To Learn Java Programming, please read the originial post: here
