In this tutorial, we will see “How to convert a Stream to an Array in Java 8?” stream to array java
Convert a Stream to an Array in Java with example...!!! Click To Tweet
Example 1. Convert Stream to String Array using toArray()
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | /** * Convert Stream to String Array using Object Array with toArray() method. * @author Deepak Verma */ import java.util.Arrays; import java.util.stream.Stream; public class Convert_Stream_to_String_Array { public static void main(String[] args) { //Stream of type String Stream<String> students = Stream.of("Tom", "Adam", "Chris", "Henry", "Jason"); //Convert Stream to Array Object Object[] objectArray = students.toArray(); //Returns the string representation of the contents of the 'objectArray' System.out.println("Stream to Array using toArray():"); System.out.println(Arrays.toString(objectArray)); } } |
Output:
1 2 | Stream to Array using toArray(): [Tom, Adam, Chris, Henry, Jason] |
Example 2. Convert Stream to Integer Array using Lambda
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | /** * Convert Stream to Integer Array using Lambda * @author Deepak Verma */ import java.util.Arrays; import java.util.List; import java.util.stream.Stream; public class Convert_Stream_to_Integer_Array_Using_Lambda { public static void main(String[] args) { // via - Stream.toArray() and lambda expression Integer[] intNumbers = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; List<Integer> listOfIntegers = Arrays.asList(intNumbers); //Convert List of Integers to Stream and then Stream to Array using Lambda Integer[] array1 = (Integer[]) listOfIntegers.stream() .toArray(x -> new Integer[x]); System.out.println("List of Integer to Stream and then to Integer array using Lambda:"); System.out.println(Arrays.asList(array1)); //OR //Stream of Integers Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); //Convert Stream to Array using Lambda Integer[] array2 = streamOfIntegers.toArray(x -> new Integer[x]); System.out.println("\nStream to Integer array using Lambda:"); //Either use this System.out.println(Arrays.asList(array2)); //Or this System.out.println(Arrays.toString(array2)); } } |
Output:
1 2 3 4 5 6 | List of Integer to Stream and then to Integer array using Lambda: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] Stream to Integer array using Lambda: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] |
Example 3. Convert Stream to Integer Array using Method Reference
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | /** * Convert Stream to Integer Array using Method Reference * @author Deepak Verma */ import java.util.Arrays; import java.util.stream.Stream; public class Convert_Stream_to_Integer_Array_using_Method_Reference { public static void main(String[] args) { //Stream of Integers Stream<Integer> streamOfIntegers = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); //Convert Stream to Array using Method Reference Integer[] array = streamOfIntegers.toArray(Integer[]::new); System.out.println("Stream to Integer array using Method Reference:"); System.out.println(Arrays.toString(array)); } } |
Output:
1 2 | Stream to Integer array using Method Reference: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] |
stream to array java
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Convert a Stream to an Array in Java with example...!!! Click To Tweet
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