Java Online Quiz – Test your knowledge in 7 min
This Java online quiz will help you to clear your java concepts and also check your java knowledge. It will increase your confidence while appearing for Java interview.
Bookmark other java quizzes as well in the series of 7 java quizzes. Some of them are as below:
- Java Quiz – 1
- Java Quiz – 2
- Java Quiz – 3
- Java Quiz – 4
So, All The Best for this Java Online Quiz.
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Question 1 of 20
1. Question
What guarantees type-safety in a collection?
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Question 2 of 20
2. Question
HashSet internally uses?
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Question 3 of 20
3. Question
The most used interfaces from the collection framework are?
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Question 4 of 20
4. Question
The root interface of Java collection framework hierarchy is –
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Question 5 of 20
5. Question
Which of those is synchronized?
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Question 6 of 20
6. Question
ArrayList implements that of the following?
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Question 7 of 20
7. Question
Which of those permits the storage of the many null values?
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Question 8 of 20
8. Question
nextIndex() and previousIndex() are methods of which interface?
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Question 9 of 20
9. Question
Vector extends that of these?
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Question 10 of 20
10. Question
LinkedList implements?
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Question 11 of 20
11. Question
In Iterator, nextElement() method of Enumeration has been changed to:
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Question 12 of 20
12. Question
Enumeration returned by Vector is?
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Question 13 of 20
13. Question
From Java five onwards, that one among these is suggested to replace Hashtable?
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Question 14 of 20
14. Question
Which doesn’t permit to store a null value?
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Question 15 of 20
15. Question
Iterator returned by Vector is?
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Question 16 of 20
16. Question
What describes an algorithm performs in best, average or worse case scenarios?
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Question 17 of 20
17. Question
State the search time complexity of an ordered array.
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Question 18 of 20
18. Question
Name the map that should be kept in a multi-threading environment to keep up the natural order of keys?
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Question 19 of 20
19. Question
TreeMap implements?
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Question 20 of 20
20. Question
Which list class should be most popular in a multi-threading environment, considering performance constraint?
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This was all about the java quiz. Do not forget to share score in the comments section and challenge others to score more.
Q4. Iterable ! Why Set/List ?
Q3. Map does not implement Collection
Q18. ConcurrentSkipListMap
Java QUizz part 2, question 4 : Collection Interface is the root interface – the corret answer ; wheras List extends Collection.
There are other mistakes – but generally the level is good and I had pleasure to review
BR
.