Answered: We need a linked list to hold…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

We need a linked list to hold information about penguins in a zoo. You will need the following integers for your IntNode (see below). I have included sample values for one of the penguins:

penguin ID: 45821
penguin weight (kg): 11
penguin height (cm): 90

We now need to track the number of penguins in the zoo. I would like to propose a better way to track the size of the list. Rather than traversing the list every time you need to know its size, why not keep a variable called listSize that increments every time you add a node to the list and decrements anytime you remove an item from the list?

public class penguinList {

//nested class IntNode goes here

private IntNode first;

private int listSize;

//...the methods of penguinList class go here

}

Now, you just need to increment the listSize instance variable in every method that adds a node to the list.
If you have any methods that removes a node from the list, decrement the listSize instance variable in those methods instead.
Finally, if you have any, remove the size methods that use traversals. You will now only need one size method, which should return the listSize instance variable.

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