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Java 8+

Lambdas, Streams, Optional, functional interfaces.

10 questions
LambdasStream APIOptionalFunctional InterfacesMethod ReferencesDefault Methods

Sample Questions (10 live)

Stream APIMedium

What is the Stream API and how is it different from a loop?

AmazonDeloitteAccentureRead →
OptionalEasy

What problem does Optional solve?

InfosysTCSRead →
Stream APIMedium

Why can parallelStream() make a service slower instead of faster in production?

AmazonGoogleDeloitteRead →
Stream APIEasy

Why isn't a Stream a data structure, and what does that mean for how you use it?

MicrosoftOracleAmazonRead →
Stream APIMedium

How does Stream laziness and short-circuiting actually work, and why does peek() surprise people?

MicrosoftAmazonOracleRead →
Stream APIMedium

When does a Stream pipeline cost more than a plain loop in a hot path?

AmazonGoogleOracleRead →
Stream APIMedium

What's the silent bug when Collectors.toMap() hits a duplicate key?

AmazonMicrosoftDeloitteRead →
OptionalMedium

When is Optional the right call, and when does it become an anti-pattern?

AmazonMicrosoftOracleRead →
Functional InterfacesMedium

Is there a real performance difference between a method reference and an equivalent lambda?

MicrosoftOracleGoogleRead →
Functional InterfacesMedium

When do you design a custom functional interface instead of reusing java.util.function?

AmazonMicrosoftDeloitteRead →

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