sig4j

Sig4j is a Java library for Qt like signals and slots which uses the FunctionalInterface Annotation introduced with Java 8. This Annotation allows sig4j to connect functions and lambdas to signals without further ado.

Quickstart

The following code snippet shows a short example:

import so.sig4j.ConnectionType;
import so.sig4j.signal.Signal1;

public class Quickstart {
    private final Signal1<String> signal = new Signal1<>();
    
    private final void print(final String string) {
        System.out.println(string);
    }

    public static void main(final String[] args) {
        Quickstart q = new Quickstart();
        q.signal.connect(q::print);
        q.signal.emit("hellow world!");
    }
}