Java 8 - Convert Stream to List

javajava8

How to convert Stream to List.

Example 1

This is an example of converting a Stream to an array and an array to a List.

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

public class ConvertStreamToList {

    public static void main(String[] args) {

        Stream<String> stream = Stream.of("Java8", "and", "Stream", "examples");

        String[] array = stream.toArray(String[]::new);

        List<String> list = Arrays.asList(array);

        for (String s : list) {
            System.out.println(s);
        }
    }
}

Output:

Java8
and
Stream
examples

Example 2

This is an example of converting to a List using collect(Collectors.toList()). It doesn`t convert to Array in the middle.

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

public class ConvertStreamToList1 {

    public static void main(String[] args) {

        Stream<String> stream = Stream.of("Java8", "and", "Stream", "examples");

        List<String> list = stream.collect(Collectors.toList());

        for (String s : list) {
            System.out.println(s);
        }
    }
}

Output:

Java8
and
Stream
examples

Example 3

This is an example of converting IntStream to Stream and Stream to Array and List in the order.

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

public class ConvertStreamToList2 {

    public static void main(String[] args) {

        IntStream intStream = IntStream.range(1, 5);

        Stream<Integer> stream = intStream.boxed();

        Integer[] result = stream.toArray(Integer[]::new);

        List<Integer> list = Arrays.asList(result);

        System.out.println(list);
    }
}

Output:

[1, 2, 3, 4]

Example 4

This is an example of converting to a List using collect(Collectors.toList()).

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;

public class ConvertStreamToList3 {

    public static void main(String[] args) {

        IntStream intStream = IntStream.range(1, 5);

        Stream<Integer> stream = intStream.boxed();

        List<Integer> list = stream.collect(Collectors.toList());

        System.out.println(list);
    }
}

Output:

[1, 2, 3, 4]

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