Java 8 Stream.iterate() VS Stream.random() - Infinite Streams

import java.util.List;
import java.util.Random;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamGenerateVSIterate {

    public static void main(String[] args) {

        // Example to generate 10 random numbers from 0 to 20.
        Supplier<Integer> infiniteStream1 = () -> new Random().nextInt(20);

        List<Integer> randomNumbers = Stream.generate(infiniteStream1).limit(15).collect(Collectors.toList());

        System.out.println("10 random numbers list : " + randomNumbers);

        // Example to generate 10 random numbers from 0 to 20.
        Stream<Integer> infiniteStream2 = Stream.iterate(0, i -> i + 1);

        List<Integer> first10Numbers = infiniteStream2.limit(15).collect(Collectors.toList());

        System.out.println("first 10 numbers list : " + first10Numbers);

    }
}

Output:

15 random numbers list : [18, 3, 11, 4, 11, 5, 19, 3, 4, 5, 11, 7, 6, 0, 0]
first 15 numbers list : [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]

Java 8 Stream.generate() - Generate Random UUID numbers from Infinite Series

package com.javaprogramto.java8.streams.infinite;

import java.util.List;
import java.util.UUID;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamGenerateExample {

    public static void main(String[] args) {

        // Generates the UUID
        Supplier<UUID> randomUUIDSupplier = () -> UUID.randomUUID();

        List<UUID> uuidList = Stream.generate(randomUUIDSupplier).limit(15).collect(Collectors.toList());

        System.out.println("10 random UUID list : "+uuidList);

    }
}

Output:

10 random UUID list :

[781bce19-1dfd-4564-b220-80fb7aa850bc, a24d411a-7d5a-4447-9f5b-77f366dfd853, ccfd492e-78a4-47f7-9941-366cd60368c7, 3a97b09d-5e47-4814-8075-098ed516572d, 3ea7aaaf-04b9-4a12-b97c-e32e0ac0db80, d98690b7-696f-4355-b1e8-ce381378f490, 173d0497-dd8f-401f-8d39-30b2ddca8cf4, 7880e981-3265-4ebf-a73e-0c706c5b21f6, ac255ce3-a964-4d15-bf9c-13b5834cbc88, 6aa279ee-32b7-4e14-b689-d1586b8b124a, 0e1dd672-99d1-498d-93cf-1ddefb9bfc34, d9dd7643-83c9-44cb-a669-483e1e6c877e, 98f3018f-a7c1-4dbb-b391-8a1d2885553a, aa75f989-01e3-4b15-93ab-5096068f26a4, ad762c3b-9a66-438a-801c-8e3c48f8a223]

Java 8 Stream.iterate() Infinite Streams Example

Java 8 Example program to generate the first 10 numbers from the infinite stream using Stream.iterate()Method

package com.javaprogramto.java8.streams.infinite;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamIterateExample {

    public static void main(String[] args) {

        // Creating a infinite Stream
        Stream<Integer> integerInfiniteStream = Stream.iterate(1, i -> i +1);

        List<Integer> first10Numbers = integerInfiniteStream.limit(10).collect(Collectors.toList());

        System.out.println("integerInfiniteStream with limit 10 : "+first10Numbers);

    }
}

Output:

integerInfiniteStream with limit 10 : [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Java 8 Example program to generate the 10 ten even numbers from the infinite stream using Stream.iterate()Method

package com.javaprogramto.java8.streams.infinite;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamIterateExample {

    public static void main(String[] args) {

        // Creating a infinite Stream
        Stream<Integer> even10Numbers = Stream.iterate(0, i -> i +2);

        List<Integer> first10Numbers = even10Numbers.limit(10).collect(Collectors.toList());

        System.out.println("even10Numbers with limit 10 : "+first10Numbers);

    }
}

Output:

even10Numbers with limit 10 : [0, 2, 4, 6, 8, 10, 12, 14, 16, 18]

Java8Example

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Saturday, August 15, 2020

Java 8 Stream.iterate() VS Stream.random() - Infinite Streams

Java 8 Stream.generate() - Generate Random UUID numbers from Infinite Series

Java 8 Stream.iterate() Infinite Streams Example

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