Simple abstract String receiver

Question

I have Objects that emit Strings to listeners...

The listeners extend the following class :

public abstract class StringReceiver {

    public abstract void receive(String input);

}

I don't want to reinvent the wheel. My question is : what is the appropriate class from the Java API to use for this kind of listener/receiver relationship?

`what is the appropriate class from the Java API to use` For what?. — John3136, May 04 '18 at 00:42
If you are using Java 8, `Consumer` has the same method signature - https://docs.oracle.com/javase/8/docs/api/java/util/function/Consumer.html — Jaroslaw Pawlak, May 05 '18 at 21:30

score 0 · Answer 1 · answered May 05 '18 at 21:43

After much downvotes and some googling,

Thanks to Jaroslaw Pawlak, I found the answer to my question.

The answer was to completely ditch the class shown in my question and to replace it with :

List of consumers :

List<Consumer<String>> inputReceivers = new ArrayList<Consumer<String>>();

Now to add consumers :

public void addReceiver(Consumer<String> receiver) {
    inputReceivers.add(receiver);
}

And triggered on event :

    for (Consumer<String> a : inputReceivers) {
            a.accept("some string data");
    }

That's all! No need to implement any interface or extend abstract class, this works well with methods.

I can do something like this :

addReceiver(s -> { 
                if (!StringUtils.isAllBlank(s)) {
                    // deal with string s
                }
            });

Almost magic!

If all you had to do was google it, then why did you ask the question in the first place? — vandench, May 05 '18 at 22:04

Simple abstract String receiver

1 Answers1