Calculate clicks per second

First you must capture the click events and put a timestamp for each. For events that inherit from java.awt.event.InputEvent , this timestamp will be present in the getWhen() method. .

After collecting a list of clicks, what you should do is something like this, depending on how you want to measure (using java 8 or higher):

public double mediaDeCliquesPorSegundo(Collection<? extends InputEvent> events) {
    return mediaPorSegundo(events.stream().map(InputEvent::getWhen).collect(Collectors.toList()));
}

public long cliquesNoUltimoSegundo(Collection<? extends InputEvent> events) {
    return noUltimoSegundo(events.stream().map(InputEvent::getWhen).collect(Collectors.toList()));
}

public double mediaPorSegundo(Collection<Long> events) {
    long max = events.stream().reduce(Long::max).orElse(0L);
    long min = events.stream().reduce(Long::min).orElse(0L);
    if (max == min) {
        throw new IllegalArgumentException("Precisa de pelo menos dois eventos em tempos diferentes para poder calcular");
    }
    return events.size() / (double) (max - min);
}

public long noUltimoSegundo(Collection<Long> events) {
    long max = events.stream().reduce(Long::max).orElse(0L);
    return events.stream().filter(x -> x > max - 1000L).count();
}

If your event class is not a subclass of java.awt.event.InputEvent , you should use one of the mediaDeCliquesPorSegundo and cliquesNoUltimo methods. If it is not, after somehow producing a Collection<Long> containing the timestamps, you must use one of the methods mediaPorSegundo or noUltimoSegundo .

If your event class is something specific like MeuEvento with a getTimestamp method, you can do something like mediaDeCliquesPorSegundo and cliquesNoUltimo methods to get Collection<Long> :

public double mediaDeMeusCliquesPorSegundo(Collection<? extends MeuEvento> events) {
    return mediaPorSegundo(events.stream().map(MeuEvento::getTimestamp).collect(Collectors.toList()));
}

public long meusCliquesNoUltimoSegundo(Collection<? extends MeuEvento> events) {
    return noUltimoSegundo(events.stream().map(MeuEvento::getTimestamp).collect(Collectors.toList()));
}