What is the generate() method of the DoubleStream interface?

The generate() method of the DoubleStream interface is used to generate an unlimited, unordered, and sequential stream, in which each element is created by the supplied DoubleSupplier interface implementation. This method may be used to create steady streams, streams with random values, and so on.

Syntax

public static DoubleStream generate(DoubleSupplier s)

Parameters

DoubleSupplier s: This is the implementation of the DoubleSupplier interface.

Return value

This method returns an infinite, sequential, and unordered stream of double values.

Code

The code given below shows us how we can use the generate() method:

import java.util.Random;
import java.util.stream.DoubleStream;
class Main {
    public static void main(String[] args) {
        DoubleStream doubleStream = DoubleStream.generate(() -> new Random().nextDouble());
        doubleStream.limit(5).forEach(System.out::println);
    }
}

Explanation

  • In lines 1 and 2, we import the Random class and the DoubleStream interface.
  • In line 6, we generate a random stream of double values, using the generate() method and the nextDouble() method of the Random class.
  • In line 7, we limit the number of random generated double values to 5 and print the random generated values.

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