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Professional Development
Professional Development
Java Collections
14 questions
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- 1. Multiple Choice
-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
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
-Entries are organized as key/value pairs.
-Duplicate entries replace old entries.
-Entries are sorted using a Comparator or the Comparable interface.
Which interface of the java.util package offers the specified behavior?
List
Map
Set
SortedSet
SortedMap
- 4. Multiple Choice
{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
- 5. Multiple Choice
{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
- 6. Multiple Choice
4
5
6
12
- 7. Multiple Choice
-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
- 8. Multiple Choice
[Computer, Network, Networks, Programming, Security]
[Computer, Programming, Network, Networks, Programming, Security]
[Computer, Programming, Computer, Networks, Network, Security]
[Computer, Networks, Network, Programming, Security]
- 9. Multiple Choice
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
- 10. Multiple Choice
What is Collection in Java?
A group of objects
A group of classes
A group of interfaces
None of the mentioned
- 11. Multiple Choice
Which of these interface is not part of Java’s collection framework?
List
Sorted List
Set
Sorted Map
- 12. Multiple Choice
What will be the output of the Java program?
{0, 1, 3, 4}
{0, 1, 2, 4}
{0, 1, 2, 3, 4}
{0, 0, 0, 3, 4}
- 13. Multiple Choice
Which of these return type of hasNext() method of an iterator?
Integer
Double
Boolean
Collections Object
- 14. Multiple Choice
Which of these methods deletes all the elements from invoking collection?
clear();
reset();
delete();
remove();
- Answer choicesTagsAnswer choicesTags