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...!!! Share on X
Example 1. Convert Stream to String Array using toArray()
/**
* 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:
Stream to Array using toArray(): [Tom, Adam, Chris, Henry, Jason]
Example 2. Convert Stream to Integer Array using Lambda
/**
* 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:
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
/**
* 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:
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...!!! Share on X
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