Java8 – How to convert Array to Stream

In Java 8, you can either use Arrays.stream or Stream.of to convert an Array into a Stream.

Example 1

package com.sheting.java8;

import java.util.Arrays;
import java.util.stream.Stream;

public class ConvertArrayToStreamExample1 {
    public static void main(String[] args) {

        String[] array = { "a", "b", "c", "d", "e" };

        // Arrays.stream
        Stream<String> stream1 = Arrays.stream(array);
        stream1.forEach(x -> System.out.println(x));

        // Stream.of
        Stream<String> stream2 = Stream.of(array);
        stream2.forEach(x -> System.out.println(x));
    }
}

Example 2

package com.sheting.java8;

import java.util.Arrays;
import java.util.stream.IntStream;
import java.util.stream.Stream;

public class ConvertArrayToStreamExample2 {
    public static void main(String[] args) {

        int[] intArray = { 1, 2, 3, 4, 5 };

        // 1. Arrays.stream -> IntStream
        IntStream intStream1 = Arrays.stream(intArray);
        intStream1.forEach(x -> System.out.println(x));

        // 2. Stream.of -> Stream<int[]>
        Stream<int[]> temp = Stream.of(intArray);

        // 【敲黑板】Can not print Stream<int[]> directly, convert / flat it to IntStream
        IntStream intStream2 = temp.flatMapToInt(x -> Arrays.stream(x));
        intStream2.forEach(x -> System.out.println(x));

    }
}