Sets Review
Flashcard
•
12th Grade - University
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
Which of the following statement about Set is true? A TreeSet can have null values. Set allows duplicate values. Set allows null values but only single occurrence. Set extends the Java.util.collection interface.
Back
Set extends the Java.util.collection interface.
2.
FLASHCARD QUESTION
Front
Entries are not organized as key/value pairs. Duplicate entries are rejected. Which interface of the java.util package offers the specified behavior?
Back
Set
3.
FLASHCARD QUESTION
Front
Back
[Computer, Network, Networks, Programming, Security]
4.
FLASHCARD QUESTION
Front
Back
Line 11 : Genetates NullPointer Exception
5.
FLASHCARD QUESTION
Front
What is the output of the following code?
List listNames = new ArrayList();
listNames.add("Tom");
listNames.add("Mary");
listNames.add("Peter");
String name2 = (String) listNames.get(1);
System.out.println(name2);
Back
Mary
6.
FLASHCARD QUESTION
Front
When do we use sets in java program?
Back
You want to store elements distinctly without duplication, or unique elements.
7.
FLASHCARD QUESTION
Front
What will happen if an element already present in the Set is added again?
Back
A boolean value of false will be returned, and the value will not be added to the Set
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