Collections & Exceptions
equals and hashCode, removing while iterating, checked exceptions, try-with-resources and immutable collections.
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- 8 questions
- ~6 mins
Answer order is shuffled each attempt. Your results are saved only in this browser.
What this quiz covers
Maps, iteration pitfalls and error handling.
- HashMap
- Lists
- Iteration
- Exceptions
- Resources
- Immutability
Java learning roadmap
See where this quiz fits from beginner to expert.
How this works
Practice or exam mode
Practice mode explains each answer straight away. Exam mode holds all answers until you finish, then shows a full review.
Shuffled answer order
Options are shuffled on every attempt, so you learn the idea rather than the position of the right letter.
Timer, flags and skips
A timer runs while you play. Flag questions to revisit them, or skip and come back from the question navigator.
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