1Z0-829 Functional interface Practice Question
Which TWO statements about lambda expressions are true? (Choose two.) 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.
⚠ Common exam trap
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.
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.
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.
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.
- ✓
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.
- ✗
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.
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 |
Go deeper
Related to this question
About these practice questions
This 1Z0-829 question is part of Courseiva's 513-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 1Z0-829 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-829 exam.