Java Online Test | Know Your Java Knowledge

1. Core Java Online Test

Get free Java online test and prepare yourself for Java exam. This Java online test will help you to test your Java performance. This practice set for Java contains the top 25 Java MCQ, which will help you to boost your confidence. If you find yourself good in Java online test, then prepare yourself to crack Java interview questions by following our Java interview guide.

So, let’s check your Java performance. ALL THE BEST! for Java online test.

Java online test

Java Online Test | Know Your Java Knowledge

Q.1 Which interface should be implemented for sorting on basis of many criteria’s?

Correct! Wrong!

Q.2 Can two threads on same ConcurrentHashMap object access it concurrently

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Q.4 LinkedHashSet implements:

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Q.5 What will be the output of the following code -

Java Quiz
Correct! Wrong!

Q.6 In WeakHashMap

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Q.7 A EnumSet

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Q.8 Iterator returned by HashSet is

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Q.9 Iterator returned by CopyOnWriteArraySet is

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Q.10 Iterator returned by TreeSet is

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Q.11 Iterator returned by LinkedHashSet is

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Q.12 Iterator returned by ConcurrentSkipListSet is

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Q.13 Which List is synchronized?

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Q.14 Which Set is synchronized?

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Q.15 What will be the output of the following code -

Java Quiz
Correct! Wrong!

Q.16 What is the significance of using instanceOf operator and getClass() in equals method?

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Q.17 What will be the output of the following code -

Java Quiz
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Q.18 What will be the output of the following code –

Java Quiz
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Q.19 What will be the output of the following code -

Java Quiz
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See also – 
Java Quiz Part 2 & Part 3

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