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Java 8 - create stream
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In this article, we would like to show you how to create a stream in Java 8.
Quick solution:
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Collection<String> collection = Arrays.asList("A", "B", "C");2
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// Create stream from the collection4
Stream<String> stream = collection.stream();
In this example, we present how to create a stream from any type of Collection such as Collection, List or Set.
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import java.util.*;2
import java.util.stream.Stream;3
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public class Example {5
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public static void main(String[] args) {7
Collection<String> collection = Arrays.asList("A", "B", "C");8
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// Create stream from the collection10
Stream<String> streamFromCollection = collection.stream();11
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// print elements13
streamFromCollection.forEach(System.out::println);14
}15
}Output:
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A2
B3
C
In this section, we present how to create a stream from specified values such as Strings or Integers.
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import java.util.stream.Stream;2
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public class Example {4
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public static void main(String[] args) {6
Stream<String> streamOfLetters = Stream.of("A", "B", "C");7
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// print elements9
streamOfLetters.forEach(System.out::println);10
}11
}Output:
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A2
B3
Cxxxxxxxxxx1
import java.util.stream.Stream;2
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public class Example {4
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public static void main(String[] args) {6
Stream<Integer> streamOfLetters = Stream.of(1, 2, 3);7
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// print elements9
streamOfLetters.forEach(System.out::println);10
}11
}Output:
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12
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In this example, we present how to create a stream from an array using Arrays.stream() method.
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import java.util.Arrays;2
import java.util.stream.Stream;3
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public class Example {5
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public static void main(String[] args) {7
String[] letters = new String[]{"A", "B", "C", "D"};8
Stream<String> streamOfArray = Arrays.stream(letters);9
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// print elements11
streamOfArray.forEach(System.out::println);12
}13
}Output:
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A2
B3
C4
DIn this example, we present how to create a stream from part of the array using Arrays.stream() with the following syntax:
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Arrays.stream(array, indexStart, indexEnd);Practical example:
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import java.util.Arrays;2
import java.util.stream.Stream;3
4
public class Example {5
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public static void main(String[] args) {7
String[] letters = new String[]{"A", "B", "C", "D"};8
Stream<String> streamOfArray = Arrays.stream(letters, 0, 2);9
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// print elements11
streamOfArray.forEach(System.out::println);12
}13
}Output:
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A2
B