Alternate of C# Events in Java

Question

I am .Net developer. i want to know that is there any event handling mechanism in Java for Events Handling like C#.

what i want to do is i want to raise/fire an even

Answer 1

I love C# Events,

They are simple to use and convenient. i missed them in java so wrote a small utility class that mimics the very basics of C# Event.

• using java 8 (for lambdas)
• no += operator, instead call .addListener((x) -> ...)
• to trigger an event, call .broadcast()

Online Demo - https://repl.it/DvEo/2

---

Event.java

import java.util.HashSet;
import java.util.Set;
import java.util.function.Consumer;

public class Event {
    private Set> listeners = new HashSet();

    public void addListener(Consumer listener) {
        listeners.add(listener);
    }

    public void broadcast(EventArgs args) {
        listeners.forEach(x -> x.accept(args));
    }
}

• You may want com.google.common.collect.Sets.newConcurrentHashSet() for thread safety

EventArgs.java

public class EventArgs {
}