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A lot of these things are already in Dart, which has a much nicer syntax. If they're going to switch from Java, I'd want them to choose Dart.

Dart supports shared memory multi threading?

DART has Erlang style actors that support concurrent threads of execution - so yes. Shared memory no AFAIK, but Dart seems to have nicer syntax.

If dart doesn't support ordinary threads, it might be meant for the web and not as a language for writing android apps.