Create Module Class and Singleton annotation for Object

suggest change

import javax.inject.Singleton;
import dagger.Module;
import dagger.Provides;

@Module
public class VehicleModule {
 
    @Provides @Singleton
    Motor provideMotor(){
        return new Motor();
    }
 
    @Provides @Singleton
    Vehicle provideVehicle(){
        return new Vehicle(new Motor());
    }
}

Every provider (or method) must have the @Provides annotation and the class must have the @Module annotation. The @Singleton annotation indicates that there will be only one instance of the object.

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