Created
February 12, 2019 08:57
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Dart for Java Developers
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| import 'dart:math'; | |
| abstract class Shape { | |
| factory Shape(String type) { | |
| if (type == 'circle') return Circle(2); | |
| if (type == 'square') return Square(2); | |
| throw 'Can\'t create $type.'; | |
| } | |
| num get area; | |
| } | |
| class Circle implements Shape { | |
| final num radius; | |
| Circle(this.radius); | |
| num get area => pi * pow(radius, 2); | |
| } | |
| class Square implements Shape { | |
| final num side; | |
| Square(this.side); | |
| num get area => pow(side, 2); | |
| } | |
| class CircleMock implements Circle { | |
| num area; | |
| num radius; | |
| } | |
| main() { | |
| final circle = Shape('circle'); | |
| final square = Shape('square'); | |
| print(circle.area); | |
| print(square.area); | |
| } |
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