
- Java Tutorial
- Java - Home
- Java - Overview
- Java - Environment Setup
- Java - Basic Syntax
- Java - Object & Classes
- Java - Constructors
- Java - Basic Datatypes
- Java - Variable Types
- Java - Modifier Types
- Java - Basic Operators
- Java - Loop Control
- Java - Decision Making
- Java - Numbers
- Java - Characters
- Java - Strings
- Java - Arrays
- Java - Date & Time
- Java - Regular Expressions
- Java - Methods
- Java - Files and I/O
- Java - Exceptions
- Java - Inner classes
- Java Object Oriented
- Java - Inheritance
- Java - Overriding
- Java - Polymorphism
- Java - Abstraction
- Java - Encapsulation
- Java - Interfaces
- Java - Packages
- Java Advanced
- Java - Data Structures
- Java - Collections
- Java - Generics
- Java - Serialization
- Java - Networking
- Java - Sending Email
- Java - Multithreading
- Java - Applet Basics
- Java - Documentation
- Java Useful Resources
- Java - Questions and Answers
- Java - Quick Guide
- Java - Useful Resources
- Java - Discussion
- Java - Examples
How to implement Flow.Publisher interface in Java 9?
A Publisher interface is a provider of an unbounded number of sequenced elements, publishing them according to the demand received from its Subscriber(s). In response to call Publisher.subscribe(Subscriber), the possible invocation sequences for methods on the Subscriber. It means that the onSubscribe() method, followed by the unbounded number of onNext() methods (as requested by Subscriber) followed by an onError() method, if there is a failure or an onComplete() method when no more elements available as long as Subscription is not canceled.
Syntax
public interface Publisher<T> { public void subscribe(Subscriber<? super T> s); }
Example
import java.util.concurrent.*; import java.util.*; import java.util.stream.*; class SimplePublisher implements Flow.Publisher<Integer> { private final Iterator<Integer> iterator; SimplePublisher(int count) { this.iterator = IntStream.rangeClosed(1, count).iterator(); } @Override public void subscribe(Flow.Subscriber<? super Integer> subscriber) { iterator.forEachRemaining(subscriber::onNext); subscriber.onComplete(); } } public class SimplePublisherImplTest { public static void main(String args[]) { new SimplePublisher(10).subscribe(new Flow.Subscriber<>() { @Override public void onSubscribe(Flow.Subscription subscription) { } @Override public void onNext(Integer item) { System.out.println("item = [" + item + "]"); } @Override public void onError(Throwable throwable) { } @Override public void onComplete() { System.out.println("complete"); } }); } }
Output
item = [1] item = [2] item = [3] item = [4] item = [5] item = [6] item = [7] item = [8] item = [9] item = [10] complete
- Related Articles
- How to implement a Set interface in JShell in Java 9?
- How can we implement the Subscriber interface in Java 9?
- How to implement ObjLongConsumer interface using lambda expression in Java?
- Why an interface cannot implement another interface in Java?
- How to implement Function interface with lambda expression in Java?\n
- How to implement the Runnable interface using lambda expression in Java?
- How to implement the ObjIntConsumer interface using lambda expression in Java?
- How to implement java.time.LocalDate using JShell in Java 9?
- How to implement an interface using an anonymous inner class in Java?
- How to implement a String in JShell in Java 9?
- How to implement the IntPredicate interface using lambda and method reference in Java?
- How to implement an ArrayList using JShell in Java 9?
- How to implement JShell using JavaFX in Java 9?\n
- How to implement the encapsulation concept in JShell in Java 9?
- How to implement a lambda expression in JShell in Java 9?

Advertisements