Question 90 of 513
1Z0-829 Working with Streams and Lambda Expressions Practice Question
Which functional interface is most appropriate for a lambda that takes a String and returns nothing?
⚠ Common exam trap
The trap here is that candidates mistakenly choose `Function<String, Void>` thinking `Void` represents 'nothing', but `Void` is a class that requires a return value of `null`, making it unsuitable for a lambda that truly returns nothing.
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
✓
Consumer<String>
A lambda that takes a String and returns nothing matches the `Consumer<String>` functional interface, which has a single abstract method `void accept(String t)`. `Consumer` is designed for operations that consume an input and produce no output, such as printing or logging the string.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Predicate<String>
Why it's wrong here
Predicate returns a boolean.
- ✗
Function<String, Void>
Why it's wrong here
Function returns a value; returning Void is possible but uncommon and requires explicit null return.
- ✗
Supplier<String>
Why it's wrong here
Supplier supplies a value, takes no input.
- ✓
Consumer<String>
Why this is correct
Consumer<String> accepts a String and returns void, best suited for side-effect operations.
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 |
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Last reviewed: Jul 4, 2026
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