Revisions to How can I convert a Java 8 Stream to an Array?

Second iteration. Explicit syntax highlighting hints (as a result, the diff looks more extensive than it really is - use view "Side-by-side Markdown" to compare).

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edited Oct 31 at 14:35

Peter Mortensen

31.4k
22
110
134

The easiest method is to use the toArray(IntFunction<A[]> 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

a b c

The easiest method is to use the toArray(IntFunction<A[]> 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

The easiest method is to use the toArray(IntFunction<A[]> 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

Brevity.

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edited Oct 31 at 14:22

Peter Mortensen

31.4k
22
110
134

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = stringStream.toArray(String[]::new);

What it does is findIt 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = stringStream.toArray(String[]::new);

What it does is find 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

The easiest method is to use the toArray(IntFunction<A[]> 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> 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

changed variable name to `stringStream` for consistency with `stringArray`

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edited Aug 23, 2018 at 17:09

Jens Bannmann

5.1k
7
54
81

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = streamStringstringStream.toArray(String[]::new);

What it does, is find 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<String> streamstringStream = ...; String[] stringArray = streamstringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> streamStringstringStream = Stream.of("a", "b", "c"); String[] stringArray = streamStringstringStream.toArray(size -> new String[size]); Arrays.stream(stringArray).forEach(System.out::println);

Prints:

a b c

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = streamString.toArray(String[]::new);

What it does, is find 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<String> stream = ...; String[] stringArray = stream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> streamString = Stream.of("a", "b", "c"); String[] stringArray = streamString.toArray(size -> new String[size]); Arrays.stream(stringArray).forEach(System.out::println);

Prints:

a b c

The easiest method is to use the toArray(IntFunction<A[]> generator) method with an array constructor reference. This is suggested in the API documentation for the method.

String[] stringArray = stringStream.toArray(String[]::new);

What it does is find 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<String> stringStream = ...; String[] stringArray = stringStream.toArray(size -> new String[size]);

The purpose of the IntFunction<A[]> generator is to convert an integer, the size of the array, to a new array.

Example code:

Stream<String> stringStream = Stream.of("a", "b", "c"); String[] stringArray = stringStream.toArray(size -> new String[size]); Arrays.stream(stringArray).forEach(System.out::println);

Prints: