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在Dart中實現(xiàn)依賴反轉(zhuǎn)原則可以通過以下幾種方式:
abstract class Dependency {
void doSomething();
}
class ConcreteDependency implements Dependency {
@override
void doSomething() {
print("Doing something in ConcreteDependency");
}
}
class DependencyConsumer {
Dependency dependency;
DependencyConsumer(this.dependency);
void useDependency() {
dependency.doSomething();
}
}
void main() {
Dependency dependency = ConcreteDependency();
DependencyConsumer consumer = DependencyConsumer(dependency);
consumer.useDependency();
}
class Dependency {
void doSomething() {
print("Doing something in Dependency");
}
}
class DependencyConsumer {
Dependency dependency;
DependencyConsumer(this.dependency);
void useDependency() {
dependency.doSomething();
}
}
class DIContainer {
static final Map<Type, dynamic> _dependencies = {};
static void register<T>(T instance) {
_dependencies[T] = instance;
}
static T resolve<T>() {
return _dependencies[T];
}
}
void main() {
DIContainer.register(Dependency());
DependencyConsumer consumer = DependencyConsumer(DIContainer.resolve<Dependency>());
consumer.useDependency();
}
通過以上兩種方式,在Dart中可以很容易地實現(xiàn)依賴反轉(zhuǎn)原則,從而使得代碼更加靈活和可維護(hù)。
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