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並前往https://www.reddit.com/r/java/comments/574vi6/proposal_for_stream_a_casting_filter_by_class/

Proposal for stream: a (casting) filter by class : r/java - Reddit

map (o -> (Circle)o) .mapToDouble(o -> o.getRadius()) .average();. It would be handy to have a single "filter by class and cast" operation ...

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