Data Structures and Algorithms Part 2

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Questions and Answers

What is one of the operations permitted in a simple linked list?

Inserting an item at the end of the list

Merging two lists

Deleting an arbitrary link

Inserting an item at the beginning of the list (correct)

In the Link class definition, which field is self-referential?

iData

Link

dData

next (correct)

Which operation does NOT belong to the simple linked list's allowed operations?

Deleting the last item in the list (correct)

Iterating through the list to display its contents

Inserting an item at the beginning of the list

Deleting the item at the beginning of the list

Which type of linked list allows traversal both forward and backward?

Doubly linked list Signup and view all the answers

What is the main purpose of the find() method in a linked list?

To locate a specified item in the list Signup and view all the answers

What happens to the links within a simple linked list when an item is deleted from the beginning?

The second link becomes the new head of the list Signup and view all the answers

What is the purpose of the constructor in the LinkList class?

To initialize the first link reference to null Signup and view all the answers

What happens to the first link reference when the insertFirst() method is called?

It is updated to reference the newly added link Signup and view all the answers

Which statement about the deleteFirst() method is correct?

It disconnects the first link and points to the second link Signup and view all the answers

What does the isEmpty() method check for in the LinkList class?

If the first link reference is null Signup and view all the answers

What is the main functionality of the insertFirst() method?

To add a new link at the start of the list Signup and view all the answers

How does the newLink variable behave within the insertFirst() method?

It initializes a new link with given data Signup and view all the answers

Which of the following statements is true regarding the LinkList class?

The first link reference starts as null. Signup and view all the answers

What is the relationship between newLink and first within the insertFirst() method?

newLink points to the old first link Signup and view all the answers

What is the purpose of the 'next' field in the Link class?

To point to the following link in the list Signup and view all the answers

What happens to the 'next' field when a new Link is created?

It is automatically set to null Signup and view all the answers

In the LinkList class, what does the 'first' reference represent?

The first link in the linked list Signup and view all the answers

Which of the following is NOT a characteristic of a simple linked list?

The links are stored in contiguous memory locations Signup and view all the answers

What does the displayLink() method do in the Link class?

It displays the contents of the current link Signup and view all the answers

During insertion in a linked list, what must be adjusted aside from adding the new link?

The next reference of the previous last link Signup and view all the answers

What initial value does the next reference of a new link in the Link class have?

It is set to null Signup and view all the answers

What is a potential reason for a linked list to be preferred over an array?

Linked lists allow dynamic size adjustments Signup and view all the answers

Study Notes

A Simple Linked List Overview

Linked lists consist of nodes called Links, each containing data and a reference to the next node.
Each Link includes:
- iData: an integer data item
- dData: a double data item
- next: a Link reference pointing to the next node
The constructor initializes iData and dData, automatically setting next to null, indicating no connection initially.

LinkList Class

Contains a reference to the first Link, termed first.
The constructor sets first to null, indicating an empty list.
A method isEmpty() checks if the list is empty by evaluating if first is null.

Linked List Operations

Basic operations in this linked list include:
- Inserting an item at the beginning
- Deleting the item at the beginning
- Displaying contents through iteration

Inserting at the Beginning

insertFirst(int id, double dd) creates a new Link and adjusts pointers:
- New Link's next references the current first
- first updates to this new Link, effectively putting it at the start of the list

Deleting from the Beginning

deleteFirst() method reverses the insertion operation:
- Updates first to point to the second Link, thus disconnecting the first Link.

Class Definitions

The Link class is self-referential, containing a next field of the same class type.
LinkList manages the list by maintaining a single reference to the first Link.

Important Method Summaries

LinkList(): Initializes an empty linked list with first set to null.
isEmpty(): Returns true if the list is empty (i.e., first is null).
insertFirst(): Inserts a new Link at the beginning by adjusting the next reference.
deleteFirst(): Removes the first Link and updates the first reference.

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Description

This quiz focuses on the implementation of a simple linked list in data structures and algorithms. It covers the essential concepts of link creation and data item management. Test your understanding of how linked lists operate and their importance in programming.