- A
A lambda expression can throw any checked exception.
Why wrong: False: Lambdas can only throw checked exceptions declared in the functional interface method, not any checked exception.
- B
A lambda expression can be assigned to a functional interface variable.
True: A lambda can be assigned to a functional interface variable because it provides an implementation for the single abstract method.
- C
A lambda expression can access final or effectively final local variables.
True: Lambdas can access local variables that are final or effectively final from the enclosing scope.
- D
A lambda expression can be used to implement multiple abstract methods.
Why wrong: False: A lambda can only implement one abstract method, not multiple.
- E
A lambda expression can be used to create an instance of an abstract class.
Why wrong: False: Lambdas cannot create instances of abstract classes; they work only with functional interfaces.
1Z0-829 Functional interface Practice Question
This 1Z0-829 practice question tests your understanding of working with streams and lambda expressions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: functional interface. 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.
Which THREE statements about lambda expressions are true? (Choose three.) A. A lambda expression can be assigned to a functional interface variable. B. A lambda expression can access final or effectively final local variables. C. A lambda expression can throw any checked exception. D. A lambda expression can be used to create an instance of an abstract class. E. A lambda expression can be used to implement multiple abstract methods.
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
A lambda expression can be assigned to a functional interface variable.
Option A is false: A lambda expression can only throw checked exceptions that are declared in the functional interface's abstract method, not any checked exception. Options B and C are true: a lambda can be assigned to a functional interface variable, and it can access final or effectively final local variables. Option D is false: a lambda can only implement one abstract method (functional interface). Option E is false: lambdas cannot instantiate abstract classes; they only implement functional interfaces.
Key principle: Functional interface
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A lambda expression can throw any checked exception.
Why it's wrong here
False: Lambdas can only throw checked exceptions declared in the functional interface method, not any checked exception.
- ✓
A lambda expression can be assigned to a functional interface variable.
Why this is correct
True: A lambda can be assigned to a functional interface variable because it provides an implementation for the single abstract method.
Related concept
Functional interface
- ✓
A lambda expression can access final or effectively final local variables.
Why this is correct
True: Lambdas can access local variables that are final or effectively final from the enclosing scope.
Related concept
Functional interface
- ✗
A lambda expression can be used to implement multiple abstract methods.
Why it's wrong here
False: A lambda can only implement one abstract method, not multiple.
- ✗
A lambda expression can be used to create an instance of an abstract class.
Why it's wrong here
False: Lambdas cannot create instances of abstract classes; they work only with functional interfaces.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates think lambdas can implement multiple abstract methods or instantiate abstract classes, but they can only implement a single abstract method of a functional interface.
Detailed technical explanation
How to think about this question
Under the hood, the Java compiler translates a lambda expression into a synthetic method (via invokedynamic) that implements the functional interface's single abstract method. The lambda's body must be compatible with the method's throws clause; if the functional interface method does not declare a checked exception, the lambda cannot throw that checked exception. This is why Option C (in the original question) is correct: lambdas can only access final or effectively final local variables, a rule enforced by the compiler to prevent concurrency issues with variable capture.
KKey Concepts to Remember
- Functional interface
- Effectively final
- Checked exceptions in lambdas
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Functional interface
Real-world example
How this comes up in practice
A practitioner preparing for the 1Z0-829 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Functional interface Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
Review functional interface, then practise related 1Z0-829 questions on the same topic to reinforce the concept.
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Working with Streams and Lambda Expressions — study guide chapter
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Working with Streams and Lambda Expressions practice questions
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
Working with Streams and Lambda Expressions — This question tests Working with Streams and Lambda Expressions — Functional interface.
What is the correct answer to this question?
The correct answer is: A lambda expression can be assigned to a functional interface variable. — Option A is false: A lambda expression can only throw checked exceptions that are declared in the functional interface's abstract method, not any checked exception. Options B and C are true: a lambda can be assigned to a functional interface variable, and it can access final or effectively final local variables. Option D is false: a lambda can only implement one abstract method (functional interface). Option E is false: lambdas cannot instantiate abstract classes; they only implement functional interfaces.
What should I do if I get this 1Z0-829 question wrong?
Review functional interface, then practise related 1Z0-829 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Functional interface
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Last reviewed: Jun 11, 2026
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