
Collections
Authored by Lejrat Mesi
Computers
University - Professional Development
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30 questions
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1.
MULTIPLE CHOICE QUESTION
45 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
45 sec • 1 pt
Which of the following statement about Set is true?
A HashSet cannot have a null value.
Set allows duplicate values.
Set allows null values but only single occurrence.
Set extends the Java.util.collection interface.
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
{1=C, 2=JavaEE, 4=Python, 3=PHP}
{1=C, 2=JavaSE, 3=Python, 4=PHP}
{1=C, 2=JavaEE, 3=Python, 4=PHP}
{1=C, 2=JavaSE,2=JavaEE, 3=Python, 4=PHP}
NullPointerException
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
{null=null, a=null, b=JavaSE, c=PHP, d=Python}
{a=null, b=JavaSE, c=PHP, d=Python}
{b=JavaSE, c=PHP, d=Python}
Compilation Fails
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
4
5
6
12
6.
MULTIPLE CHOICE QUESTION
45 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
7.
MULTIPLE CHOICE QUESTION
45 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]
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