Casting to an interface allows you to pass/refer to objects with the same behavior.
For example, if you wanted to make a report from a bunch of forecasts you could write code like this:
/* Collect some forecastable things */List<Forecastable>forecastables=Arrays.asList(nycWeather,frankfurtWeather,nyse,dax);/* Get the forecasts themselves */List<Forecast>forecasts=forecastables.stream().map(Forecastable::getForecast).collect(Collectors.toList());/* Add the forecasts to our report */report.addForecasts(forecasts);
Here you can see that we only need the Forecastable subset of these objects' functionality so we cast them to the interface.
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Casting to an interface allows you to pass/refer to objects with the same behavior.
For example, if you wanted to make a report from a bunch of forecasts you could write code like this:
Here you can see that we only need the
Forecastablesubset of these objects' functionality so we cast them to the interface.