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

Overview

The generate() method of the Stream interface is used to generate an unlimited, unordered, sequential stream, with each element created by the supplied Supplier interface implementation. This may be used to create steady streams, streams with random components, and so forth.

Syntax

public static<T> Stream<T> generate(Supplier<? extends T> s)

Parameters

  • Supplier<? extends T> s: This is the Supplier interface implementation.

Return value

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

Code

The code below shows how we can use the generate() method.

import java.util.Random;
import java.util.stream.Stream;
class Main {
    public static void main(String[] args) {
        // Generate a stream of random double values of length 5 and printing it to the console
        Stream.generate(new Random()::nextDouble).limit(5).forEach(System.out::println);
    }
}

Explanation

  • Lines 1-2: We import the relevant packages.
  • Line 7: We generate a stream of random double values of length 5 and print it to the console.

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