Question 219 of 513
1Z0-829 Working with Streams and Lambda Expressions Practice Question
A lambda expression that takes two integers and returns a boolean indicating whether the first is greater than the second is best represented by which functional interface?
⚠ Common exam trap
Watch out — candidates often confuse BiPredicate with BiFunction or Predicate, mistakenly thinking a two-argument boolean operation can be represented by a single-argument Predicate or by a BiFunction that returns a Boolean, but the exam tests the precise functional interface that matches the lambda's signature and return type without unnecessary boxing.
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
✓
BiPredicate<Integer, Integer>
BiPredicate<Integer, Integer> is a functional interface that takes two arguments (both Integer) and returns a boolean, which exactly matches the lambda expression's signature (int, int) -> boolean. The lambda can be written as (a, b) -> a > b, and BiPredicate is the standard interface for such two-argument boolean-valued operations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BiFunction<Integer, Integer, Boolean>
Why it's wrong here
BiFunction works but is less specific than BiPredicate for boolean returns.
- ✗
Predicate<Integer>
Why it's wrong here
Predicate takes only one argument.
- ✗
BinaryOperator<Boolean>
Why it's wrong here
BinaryOperator takes two arguments of the same type and returns a value of that type, not boolean.
- ✓
BiPredicate<Integer, Integer>
Why this is correct
Correct. BiPredicate<Integer, Integer> is the functional interface for two input arguments returning a boolean.
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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