what is the purpose of this & symbol in this context?

Question

public class WeatherAggregator {
    private List<WeatherSource> weatherSources;

    public WeatherAggregator(List<WeatherSource> weatherSources) {
        this.weatherSources = weatherSources;
    }

    public double getTemperature() {
        return weatherSources
            .stream()
            .mapToDouble(WeatherSource::getTemperatureCelcius)
            .average()
            .getAsDouble();
    }
}

I searched about what does the & symbol here mean but I could not find any meaning to it ?! can you tell what is going on in this line ?

private List<WeatherSource>weatherSources;

Answer 1

It is just HTML source encoding of the < and > . The following:

List<WeatherSource>

is actually

List<WeatherSource>

See here for the HTML escape characters