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serpicokhan/gist:00c6ec0a0255d32a3bfb549b3f7d9b45

Created May 16, 2022 13:44
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abstract.dart
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gistfile1.txt
// This class is declared abstract and thus
// can't be instantiated.
abstract class AbstractContainer {
// Define constructors, fields, methods...
void updateChildren(); // Abstract method.
}
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