
Java Collections Dr LJK
Quiz
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Professional Development
•
Professional Development
•
Practice Problem
•
Hard
Jayakumar Loganathan
Used 2+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
-Contains no duplicate elements.
-Can contain at most one Null value.
-Elements are not key-value pairs.
-Accessing an element can be almost as fast as performing a similar operation on an array.
Which of these classes provides the specified features?
LinkedList
TreeMap
HashSet
LinkedHashMap
HashMap
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4
5
6
12
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
-Entries are not organized as key/value pairs.
-Duplicate entries are rejected.
Which interface of the java.util package offers the specified behavior?
List
Map
Set
None of the above
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
[Computer, Network, Networks, Programming, Security]
[Computer, Programming, Network, Networks, Programming, Security]
[Computer, Programming, Computer, Networks, Network, Security]
[Computer, Networks, Network, Programming, Security]
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Which of the following is/are correct statements?
HashSet class implements the Set interface
HashSet does not allow duplicate elements that means you can not store duplicate values in HashSet.
HashSet permits to have a single null value.
HashMap does not allow duplicate keys however it allows to have duplicate values.
HashMap and HashSet are threadsafe
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
List listNames = new ArrayList();
listNames.add("Tom");
listNames.add("Mary");
listNames.add("Peter");
String name2 = (String) listNames.get(1);
System.out.println(name2);
What is the output of the above code
Tom
Mary
Peter
raises Exception
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the list nums if it is initially [5, 3, 1] and the following code is executed?
nums.add(6);
nums.add(0, 4);
nums.remove(1);
[4, 3, 1, 6]
[5, 3, 1, 6]
[4, 3, 6]
[4, 5, 3, 6]
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