The following is a simple example:

    int getCylinders()
    String start()
}
@Singleton (2)
class V8Engine implements Engine {
    int cylinders = 8
    @Override
    String start() {
    }
@Singleton
class Vehicle {
    final Engine engine
    Vehicle(Engine engine) { (3)
        this.engine = engine
    }
        engine.start()
    }

To perform dependency injection simply run the using the run() method and lookup a bean using getBean(Class), as per the following example:

final BeanContext context = BeanContext.run();
Vehicle vehicle = context.getBean(Vehicle.class);
System.out.println(vehicle.start());

val context = BeanContext.run()
val vehicle = context.getBean(Vehicle::class.java)
println(vehicle.start())

Micronaut supports the following types of dependency injection:

• Constructor injection (must be one public constructor or a single contructor annotated with )

• Method parameter injection