Chapter 4, Problem 53E

Explanation of Solution

Given: The class named ArrayList is discovered inside the java.util package, which includes another class known as Linked List.

To find:

The information about LinkedList.

The comparison between ArrayList and LinkedList.

The methods that are similar and different between LinkedList and Arraylist.

Solution:

The implementation of LinkedList is slightly different from that of ArrayList in Java. These are:

LinkedList preserves its elements in the form of doubly-linked list whereas in case of ArrayList, it's a simple dynamic array which expands or shrinks according to the number of elements added to it.

We can also insert elements at any place in a LinkedList since it retains the track of linking between previous and next elements, whereas in case of ArrayList we can also insert elements at any position in the list but it requires shifting of all the latter elements to create space for new elements.

When huge number of elements are added to an ArrayList which if crosses its underlying size of the array, then a new array double of its size is reserved and the old array gets copied into the new one. But in case if LinkedList no such thing happens, since its underlying structure is not an array, a list of elements each of which is linked together by its previous and next memory locations.

The methods which are common to both the ArrayList and LinkedList, are given below with their workings:

add(int index, Object element) – used to add an element at particular index of the list.

add(Object element) - appends an element at the termination of the list.

addAll(Collection c) - adds a collection at the termination of the list.

addAll(int index, Collection c) - inserts a collection at a specified index of the list.

clear() - removes all the elements of the list.

clone() - copies an instance of the list to a new array and then returns that array.

contains(Object element) - checks to see that the specified element exists in the list or not. If so, it returns true else returns false.

get(int index) – used to return the element of the stated index of the list.

indexOf(Object element) – used to return an index for the first occurrence of the specific element that is stated in the list if it is found, or else it returns -1...