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How can I convert a Java 8 Stream to an Array?
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arraystreamhowjavaconvertcan
Problem
What is the easiest/shortest way to convert a Java 8
Stream into an array?Solution
The easiest method is to use the
It finds a method that takes in an integer (the size) as argument, and returns a
You could also write your own
The purpose of the
Example code:
Prints:
toArray(IntFunction generator) method with an array constructor reference. This is suggested in the API documentation for the method.String[] stringArray = stringStream.toArray(String[]::new);It finds a method that takes in an integer (the size) as argument, and returns a
String[], which is exactly what (one of the overloads of) new String[] does.You could also write your own
IntFunction:Stream stringStream = ...;
String[] stringArray = stringStream.toArray(size -> new String[size]);The purpose of the
IntFunction generator is to convert an integer, the size of the array, to a new array.Example code:
Stream stringStream = Stream.of("a", "b", "c");
String[] stringArray = stringStream.toArray(size -> new String[size]);
Arrays.stream(stringArray).forEach(System.out::println);Prints:
a
b
c
Code Snippets
String[] stringArray = stringStream.toArray(String[]::new);Stream<String> stringStream = ...;
String[] stringArray = stringStream.toArray(size -> new String[size]);Stream<String> stringStream = Stream.of("a", "b", "c");
String[] stringArray = stringStream.toArray(size -> new String[size]);
Arrays.stream(stringArray).forEach(System.out::println);Context
Stack Overflow Q#23079003, score: 1653
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