JAVA FOR DEVELOPERS

Which of these packages contain all the collection classes?java.awt

• java.lang

• java.util

• java.net

• java.awt

Which of these classes is not part of Java’s collection framework?

• Maps

• Array

• Stack

• Queue

Which of this interface is not a part of Java’s collection framework?

• List

• Set

• SortedMap

• SortedList

What is Collection in Java?

• A group of objects

• A group of classes

• A group of interfaces

• None of the mentioned

A List in Java accesses any element from its ___?

• key

• index

• value

• position

Which among the following allow duplicate elements?

• ArrayList

• HashSet

• LinkedHashSet

• TreeSet

Which of these interfaces must contain unique elements?

• List

• Queue

• Set

• Deque

Entries in a stack are ‘ordered’. What is the meaning of this statement?

• A collection of stacks is sorted.

• Stack entries are stored in a FIFO (First In, First Out) manner.

• Stack entries are stored in a LIFO (Last In, First Out) manner.

• A stack keeps track of the number of entries it contains.

Which of the following is true about LinkedHashSet in Java?

• It does not allow null elements.

• It maintains the insertion order of elements.

• It allows duplicate elements.

• It is synchronized by default.

Which of these classes provide an implementation of the Map interface?

• ArrayList

• TreeSet

• HashMap

• LinkedList