In this tutorial, we will see “How to generate Infinite stream of values using Java 8?”Generate infinite stream of values in java 8
In Java 8, the Stream.generate() method can be used to generate an infinite stream of values. This method takes a Supplier<T> as an argument which is a functional interface that defines a method get() that generates the next value in the stream.
Java 8 – How to Generate Infinite Stream of Values? Click To Tweet
Using below example, learn how generate() method can be used to generate an infinite stream of random numbers:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | /** * Using 'generate' method of Java 8 Stream, create infinite stream of values * @author Deepak Verma * */ import java.util.Random; import java.util.stream.Stream; public class Generate_Infinite_Stream_Of_Values_Java8_Example { public static void main(String args[]) { Random random = new Random(); Stream<Double> randomNumbers = Stream.generate(random::nextDouble); randomNumbers.forEach(System.out::println); } } |
Output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 0.0866725571572432 0.5356644334800491 0.2192017138052651 0.8080789865151401 0.7752261572301408 0.0018122228851923383 0.2772936988222323 0.07417026154673667 0.8872217548221702 0.038617746014178334 0.6513961288493136 0.035659661529567344 0.10961282276036777 .............. ......... .... |
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In the above example, random::nextDouble is a method reference to the nextDouble() method of the Random class, which creates a random double value between 0.0 and 1.0.
In order to limit the stream to a specific value then limit() method can be used:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | /** * Using 'Limit' method of Java 8 Stream, Limit the infinite stream of values to a specific limit * @author Deepak Verma * */ import java.util.Random; import java.util.stream.Stream; public class Generate_Infinite_Stream_Of_Values_Java8_Example { public static void main(String args[]) { Random random = new Random(); Stream<Double> randomNumbers = Stream.generate(random::nextDouble).limit(5); randomNumbers.forEach(System.out::println); } } |
Output:
1 2 3 4 5 | 0.10590612189140236 0.1542923812372361 0.6045931739634557 0.025816524638359373 0.2260982830392817 |
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Using above example, we can create a stream of random double values limited to ‘5’.
For your information, let me share that ‘generate’ method can be used to create a stream of any type of elements.
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1 | Stream<String> stringStream = Stream.generate(() -> "test").limit(10); |
Generate infinite stream of values in java 8
Using above code, you can create a stream of 5 Strings with value “test”.
Java 8 – How to Generate Infinite Stream of Values? Click To Tweet
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