Java – How to convert Array to Stream

Java – How to convert Array to Stream

1. Object Arrays
package com.mkyong.java8;

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

public class TestJava8 {

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));
}

}

Output

a
b
c
d
e

a
b
c
d
e

2. Primitive Arrays
package com.mkyong.java8;

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

public class TestJava8 {

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);

// Cant print Stream<int[]> directly, convert / flat it to IntStream
IntStream intStream2 = temp.flatMapToInt(x -> Arrays.stream(x));
intStream2.forEach(x -> System.out.println(x));

}

}

Output

1
2
3
4
5

1
2
3
4
5

http://www.mkyong.com/java8/java-how-to-convert-array-to-stream/