Java Multiple Choice Questions & Answers – A Door to Success

1. Online Java Multiple Choice Questions

Earlier, we have discussed Java MCQ’s Part 3. Today, we have come with Java multiple choice questions. These Java multiple choice questions will help you to test yourself in Java Programming Language. Answers all these java multiple choice questions and follow the link to get a better understanding.

So, let’s start Java Multiple Choice Questions.

Java Multiple Choice Questions

Java Multiple Choice Questions & Answers

All the best for the quiz! - Java Quiz part 4

Q.1 Iterator returned by Hashtable on key, value and entry are?
Q.2 Iterator returned by ConcurrentHashMap on key, value and entry is?
Q.3 Iterator returned by LinkedHashMap on key, value and entry is?
Q.4 Iterator returned by TreeMap on key, value and entry is?
Q.5 Iterator returned by ConcurrentSkipListMap on key, value and entry is?
Q.6 Which Set implementation is sorted and synchronized?
Q.7 TreeMap -
a. 
Doesn't enable null key
b. 
Allow several null values
Q.8 What will be the output of the following code –
Java Quiz
Q.9 What will be the output of the following code -

Java Quiz
Q.10 What will be the output of the following code -
Java Quiz
Q.11 What will be the output of the following code -
Java Quiz
Q.12 What will be the output of the following code -
Java Quiz
Q.13 What will be the output of the following code -Java Quiz
Q.14 Which Map is synchronized?
a. 
Hashtable
b. 
ConcurrentSkipListMap
c. 
ConcurrentHashMap
Q.15 concurrentSkipListMap permits
a. 
One null key
b. 
Many null values
Q.16 What should we use get operations are more?
Q.17 Complexity of ArrayList get method
Q.18 Which is sorted by natural order?
Q.19 Which of these maintains insertion order?
a.
List
b.
Set
Q.20 Which maintains insertion order?
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See also –
java Multiple Choice Question Part 2
Free java Quiz part 1

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