Question 183 of 509

Utilizing Java Object-Oriented Approach →easyMultiple ChoiceObjective-mapped

1Z0-829 Utilizing Java Object-Oriented Approach Practice Question

This 1Z0-829 practice question tests your understanding of utilizing java object-oriented approach. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

You are designing a logging framework for a distributed application. The framework must support multiple output destinations (console, file, network socket) and allow clients to dynamically add new destinations at runtime without modifying existing code. Currently, the application uses a single static Logger class with methods like logToConsole(String msg) and logToFile(String msg). The team needs to refactor the code to adhere to the Open/Closed Principle and support extensibility. After reviewing the requirements, you propose using a combination of an interface and a strategy pattern. However, a senior developer argues that using a simple enum with abstract methods would be sufficient. Which course of action best adheres to object-oriented design principles and allows the most flexibility for future extensions?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1easymultiple choice

Read the full NAT/PAT explanation →

A
Keep the existing static methods but add a new method for each destination as needed. Use conditional logic to select the destination at runtime.
Why wrong: This requires modifying the Logger class for each new destination, violating Open/Closed Principle and leading to code duplication.
B
Refactor Logger to be an interface, and implement concrete destination classes (ConsoleLogger, FileLogger, SocketLogger). Use dependency injection to pass the desired destination to the Logger client.
This follows the strategy pattern and Open/Closed Principle, allowing new destinations to be added without modifying existing code.
C
Create an enum LogDestination with values CONSOLE, FILE, SOCKET, each overriding an abstract log(String) method. The Logger class uses a static method that accepts a LogDestination and calls its log method.
Why wrong: Adding a new destination requires modifying the enum, which violates Open/Closed Principle.
D
Refactor Logger to be an abstract class with an abstract log method, and create subclasses for each destination. Use a factory method to instantiate the correct subclass.
Why wrong: Although better than B or C, adding a new destination still requires modifying the factory, and abstract classes are less flexible than interfaces for multiple inheritance of type.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Refactor Logger to be an interface, and implement concrete destination classes (ConsoleLogger, FileLogger, SocketLogger). Use dependency injection to pass the desired destination to the Logger client.

Option A uses an interface and dependency injection, which allows new destinations to be added without modifying existing code, fully adhering to the Open/Closed Principle. Option B (enum) requires modifying the enum to add new destinations, violating Open/Closed. Option C (adding methods) also requires modification. Option D (abstract class with subclasses) still requires a factory modification. Therefore, A is the best.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Keep the existing static methods but add a new method for each destination as needed. Use conditional logic to select the destination at runtime.
Why it's wrong here
This requires modifying the Logger class for each new destination, violating Open/Closed Principle and leading to code duplication.
✓
Refactor Logger to be an interface, and implement concrete destination classes (ConsoleLogger, FileLogger, SocketLogger). Use dependency injection to pass the desired destination to the Logger client.
Why this is correct
This follows the strategy pattern and Open/Closed Principle, allowing new destinations to be added without modifying existing code.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create an enum LogDestination with values CONSOLE, FILE, SOCKET, each overriding an abstract log(String) method. The Logger class uses a static method that accepts a LogDestination and calls its log method.
Why it's wrong here
Adding a new destination requires modifying the enum, which violates Open/Closed Principle.
✗
Refactor Logger to be an abstract class with an abstract log method, and create subclasses for each destination. Use a factory method to instantiate the correct subclass.
Why it's wrong here
Although better than B or C, adding a new destination still requires modifying the factory, and abstract classes are less flexible than interfaces for multiple inheritance of type.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 1Z0-829 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this 1Z0-829 question test?

Utilizing Java Object-Oriented Approach — This question tests Utilizing Java Object-Oriented Approach — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: Refactor Logger to be an interface, and implement concrete destination classes (ConsoleLogger, FileLogger, SocketLogger). Use dependency injection to pass the desired destination to the Logger client. — Option A uses an interface and dependency injection, which allows new destinations to be added without modifying existing code, fully adhering to the Open/Closed Principle. Option B (enum) requires modifying the enum to add new destinations, violating Open/Closed. Option C (adding methods) also requires modification. Option D (abstract class with subclasses) still requires a factory modification. Therefore, A is the best.

What should I do if I get this 1Z0-829 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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