JAVA EE: How to generate stream using generate and iterate methods of Java 8 streams

Friday 20 October 2017

How to generate stream using generate and iterate methods of Java 8 streams | Streams in Java 8

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StreamDemo1.java

import java.util.Arrays;
import java.util.stream.Stream;
/**
 * Generate Stream using Stream.generate()
 */
public class StreamDemo1
{
    public static void main(String[] args)
    {
        Stream<String> stream = Stream.generate(() -> "welcome").limit(5);
        String[] strArr = stream.toArray(String[]::new);
        System.out.println(Arrays.toString(strArr));
    }

}

Output

[welcome, welcome, welcome, welcome, welcome]

StreamDemo2.java

import java.util.stream.Stream;
/**
 * Generate Stream using Stream.iterate().
 */
public class StreamDemo2
{
    public static void main(String[] args)
    {
        Stream<Long> iterateNumbers = Stream.iterate(1L, n -> n + 10).limit(5);
        iterateNumbers.forEach(System.out::println);
    }

}

Output

StreamDemo3.java

import java.util.regex.Pattern;
/**
 * Generate Stream from APIs like Regex.
 */
public class StreamDemo3
{
    public static void main(String[] args)
    {
        String str = "Welcome,to,India";
        Pattern.compile(",").splitAsStream(str).forEach(System.out::println);
    }

}