Java & the JVM · topic 3 of 6

Java 8+

Lambdas, Streams, Optional, functional interfaces.

Questions below are grouped from foundations to advanced. Work top to bottom if the topic is new to you, or jump to a level if you are brushing up.

Questions
10
Difficulty mix
2 easy · 8 medium

Topics covered

  • Stream API6
  • Optional2
  • Functional Interfaces2

Foundations

Easy · 2 questions

Definitions and building blocks — start here if the topic is new to you.

Core concepts

Medium · 8 questions

The questions most interviews spend their time on: how it works and when to use it.

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