25 Java 8 Interview Questions Every Developer Should Know

Published: 15 August 2026
on channel: JAVA INTERVIEW BUDDY

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Preparing for a Java Developer interview? In this video, I’m covering 25 important Java 8 interview questions every developer should know.

Java 8 is still one of the most frequently discussed topics in Java interviews, especially for experienced developers. These questions will help you revise the important concepts and understand how to explain them confidently during an interview.

In this video, we will cover topics like:

✅ Lambda Expressions
✅ Functional Interfaces
✅ Stream API
✅ map() vs flatMap()
✅ filter(), map() and reduce()
✅ Optional
✅ Method References
✅ Default and Static Methods
✅ Predicate, Consumer, Supplier and Function
✅ Intermediate vs Terminal Operations
✅ Lazy Evaluation
✅ Parallel Streams
✅ Collectors
✅ forEach()
✅ Java 8 Date and Time API
✅ And many more important Java 8 concepts

These questions are useful for developers preparing for Java interviews at Cognizant, Accenture, Capgemini, Infosys, TCS, Wipro, LTIMindtree and other product and service-based companies.

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