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Submitted by c-admin on Wed, 05/29/2019 - 05:43

QID:

237

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

ArrayList

Question:

Identify the correct statements about ArrayList?

Select 3 options

A. ArrayList extends java.util.AbstractList.
B. It allows you to access its elements in random order.
C. You must specify the class of objects you want to store in ArrayList when you
declare a variable of type ArrayList.
D. ArrayList does not implement RandomAccess.
E. You can sort its elements using Collections.sort() method.

Answer and Explanation (Click to expand)

Answer:

A - ArrayList is a subclass of AbstractList.
java.lang.Object
- java.util.AbstractCollection<E>
- java.util.AbstractList<E>
- java.util.ArrayList<E>
All Implemented Interfaces:
Serializable, Cloneable, Iterable<E>, Collection<E>, List<E>, RandomAccess

B - This is true because you can directly access any element using get(index) method. (This is unlike a LinkedList, in which you have to go through all the elements occuring before Nth element before you can access the Nth element.)

E - An ArrayList is a List so you can use it where ever a List is required. This include Collections methods such as sort, reverse, and shuffle.

Q&A Set:

Set 31

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