Java 8 – How to convert IntStream to Integer[]
The key is boxed()
the IntStream
into a Stream<Integer>
, then only convert to an Array.
StreamExample.java
package com.mkyong;
import java.util.Arrays;
import java.util.stream.IntStream;
import java.util.stream.Stream;
public class StreamExample {
public static void main(String[] args) {
//int[] -> IntStream -> Stream<Integer> -> Integer[]
int[] num = {3, 4, 5};
//1. int[] -> IntStream
IntStream stream = Arrays.stream(num);
//2. IntStream -> Stream<Integer>
Stream<Integer> boxed = stream.boxed();
//3. Stream<Integer> -> Integer[]
Integer[] result = boxed.toArray(Integer[]::new);
System.out.println(Arrays.toString(result));
// one line
Integer[] oneLineResult = Arrays.stream(num).boxed().toArray(Integer[]::new);
System.out.println(Arrays.toString(oneLineResult));
}
}
Output
[3, 4, 5]
[3, 4, 5]
Thanks pal. Nice separation of the metods sequence.