가장 많이 묻는 면접 질문과 답변 & 온라인 테스트
면접 준비, 온라인 테스트, 튜토리얼, 라이브 연습을 위한 학습 플랫폼

집중 학습 경로, 모의고사, 면접 준비 콘텐츠로 실력을 키우세요.

WithoutBook은 주제별 면접 질문, 온라인 연습 테스트, 튜토리얼, 비교 가이드를 하나의 반응형 학습 공간으로 제공합니다.

라이브러리 검색
Prepare Interview

Java 8 면접 질문과 답변

Test your skills through the online practice test: Java 8 Quiz Online Practice Test

관련 차이점

Java 7 vs Java 8Java 8 vs Java 9

Ques 11. What is the difference between Predicate and Function?

Both are functional interfaces.
  • Predicate<T> is single argument function and either it returns true or false. This can be used as the assignment target for a lambda expression or method reference.
  • Function<T,R> is also single argument function but it returns an Object. Here T denotes type of input to the function and R denotes type of Result. This can also be used as the assignment target for a lambda expression or method reference.

도움이 되었나요? Add Comment View Comments
 

Ques 12. What the issues with Old Date and time API before Java 8? Date and Time API differences between Java 8 and earlier Java version.

Issues with old Date and Time API:
  • Thread Safety: You might be already aware that java.util.Date is mutable and not thread safe. Even java.text.SimpleDateFormat is also not Thread-Safe. New Java 8 date and time APIs are thread safe.
  • Performance: Java 8 new APIs are better in performance than old Java APIs.
  • More Readable: Old APIs such Calendar and Date are poorly designed and hard to understand. Java 8 Date and Time APIs are easy to understand and comply with ISO standards.

도움이 되었나요? Add Comment View Comments
 

Ques 13. Provide some APIs of Java 8 Date and Time.

LocalDate, LocalTime, and LocalDateTime are the Core API classes for Java 8. As the name suggests, these classes are local to context of observer. It denotes current date and time in context of Observer.

도움이 되었나요? Add Comment View Comments
 

Ques 14. How will you get current date and time using Java 8 Date and TIme API?

You can simply use now() method of LocalDate to get today’s date.
LocalDate currentDate = LocalDate.now();
System.out.println(currentDate);

Output:
2017-09-09

You can use now() method of LocalTime to get current time.
LocalTime currentTime = LocalTime.now();
System.out.println(currentTime);
 
Output:
23:17:51.817

도움이 되었나요? Add Comment View Comments
 

Ques 15. Do we have PermGen in Java 8? What is MetaSpace in Java 8?

Until Java 7, JVM used an area called PermGen to store classes. It got removed in Java 8 and replaced by MetaSpace.
Major advantage of MetaSpace over permgen:
PermGen was fixed in term of maximum size and can not grow dynamically but Metaspace can grow dynamically and do not have any size constraint.

도움이 되었나요? Add Comment View Comments
 

Most helpful rated by users:

Copyright © 2026, WithoutBook.