[Solved] Trace the sequence of events when a client requests a service via Dependency Injection (DI) in an IoC container. Which step correctly follows the previous? | OOP & Design Patterns

OOP & Design Patterns - Interface Segregation & Dependency Inversion - Fat Interfaces & IoC

Trace the sequence of events when a client requests a service via Dependency Injection (DI) in an IoC container. Which step correctly follows the previous?

AClient creates the service instance directly, then passes it to the IoC container.

BClient requests the service from the IoC container, which then creates and injects dependencies into the client.

CService creates the client instance and injects itself into the client.

DIoC container instantiates the service and injects it into the client before the client uses it.

Step-by-Step Solution

Step 1: Understand DI and IoC flow
In Dependency Injection via IoC, the client requests a service from the container, which manages creation and injection.
Step 2: Analyze options
Client requests the service from the IoC container, which then creates and injects dependencies into the client. correctly describes the client requesting the service and the container creating and injecting dependencies. Client creates the service instance directly, then passes it to the IoC container. reverses roles incorrectly. IoC container instantiates the service and injects it into the client before the client uses it. suggests container injects before client requests, which is inaccurate. Service creates the client instance and injects itself into the client. incorrectly states the service creates the client.
Final Answer:
Option B -> Option B
Quick Check:
IoC container controls creation; client depends on container to provide dependencies.

Quick Trick: In DI, client asks container; container creates and injects dependencies.

Common Mistakes:

MISTAKES

Thinking client creates service instances directly
Assuming container injects dependencies before client requests
Confusing who controls object creation

Trap Explanation:

PITFALL

Options A and B confuse control flow, making it seem client or container acts out of order. Option C reverses roles entirely.

Interviewer Note:

CONTEXT

Tests understanding of the runtime flow of Dependency Injection and IoC.

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More OOP & Design Patterns Quizzes

Trace the sequence of events when a client requests a service via Dependency Injection (DI) in an IoC container. Which step correctly follows the previous?

Step 1: Understand DI and IoC flow

Step 2: Analyze options

Final Answer:

Quick Check:

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