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How do I set an element in a list without using LinkedList methods

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0

For homework, I am working on writing a LinkedList class, that replaces the LinkedList methods. I'm working on the "set" method.

Here's what I have so far for the set() method. It takes in int index and X item as parameters. The head of the node is in a variable called first. (The whole class is genericized.)

Node<X> p = new Node<X>();
if(index < 0 || index > size()-1)
 throw new Bonfire();

int count = 0;
while(count != index)
 p = p.next;
 count++;

if(count == index)
 p.item = item;

Node class:

public class Node<T>

 T item;
 Node<T> next;

When I go to run my code against some test code that I have, it fails the test.

Test Code:

LList<String> b = new LList<String>();
b.add("Hello");
b.add("Bye");
b.set(0, "Bonjour");
assertEquals("Bonjour", b.get(0));

Failed test Reason: org.junit.ComparisonFailure: expected:<[Bonjour]> but was:<[Hello]>

(add(), size(), and get() methods are working correctly.)

So my question is, how do I get this to set the element correctly? From this code, and from why it's failing the test, it looks like it's not setting anything at all. If you need any extra information from me, do not hesitate to ask me. Appreciate the help. Thanks!

java list linked-list

share|improve this question

edited Mar 9 at 6:28

Yoshi24517

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is there a reason why you’re creating a new Node? Don’t you have the head stored in a field?
  
  – Logan
  Mar 9 at 6:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In my other methods I never used a head.
  
  – Yoshi24517
  Mar 9 at 6:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well you appear to just be creating a new Node, which won’t have any links to any other Nodes. Does your class have any fields?
  
  – Logan
  Mar 9 at 6:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I actually forgot I made a first and last variable for the first and last parts of the list, including in the add() method.
  
  – Yoshi24517
  Mar 9 at 6:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, I assumed that was your issue.
  
  – Logan
  Mar 9 at 6:26
  

  
  
  
  

 | 
show 1 more comment

0

For homework, I am working on writing a LinkedList class, that replaces the LinkedList methods. I'm working on the "set" method.

Here's what I have so far for the set() method. It takes in int index and X item as parameters. The head of the node is in a variable called first. (The whole class is genericized.)

Node<X> p = new Node<X>();
if(index < 0 || index > size()-1)
 throw new Bonfire();

int count = 0;
while(count != index)
 p = p.next;
 count++;

if(count == index)
 p.item = item;

Node class:

public class Node<T>

 T item;
 Node<T> next;

When I go to run my code against some test code that I have, it fails the test.

Test Code:

LList<String> b = new LList<String>();
b.add("Hello");
b.add("Bye");
b.set(0, "Bonjour");
assertEquals("Bonjour", b.get(0));

Failed test Reason: org.junit.ComparisonFailure: expected:<[Bonjour]> but was:<[Hello]>

(add(), size(), and get() methods are working correctly.)

So my question is, how do I get this to set the element correctly? From this code, and from why it's failing the test, it looks like it's not setting anything at all. If you need any extra information from me, do not hesitate to ask me. Appreciate the help. Thanks!

java list linked-list

share|improve this question

edited Mar 9 at 6:28

Yoshi24517

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is there a reason why you’re creating a new Node? Don’t you have the head stored in a field?
  
  – Logan
  Mar 9 at 6:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  In my other methods I never used a head.
  
  – Yoshi24517
  Mar 9 at 6:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Well you appear to just be creating a new Node, which won’t have any links to any other Nodes. Does your class have any fields?
  
  – Logan
  Mar 9 at 6:22
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I actually forgot I made a first and last variable for the first and last parts of the list, including in the add() method.
  
  – Yoshi24517
  Mar 9 at 6:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yeah, I assumed that was your issue.
  
  – Logan
  Mar 9 at 6:26
  

  
  
  
  

 | 
show 1 more comment

For homework, I am working on writing a LinkedList class, that replaces the LinkedList methods. I'm working on the "set" method.

Here's what I have so far for the set() method. It takes in int index and X item as parameters. The head of the node is in a variable called first. (The whole class is genericized.)

Node<X> p = new Node<X>();
if(index < 0 || index > size()-1)
 throw new Bonfire();

int count = 0;
while(count != index)
 p = p.next;
 count++;

if(count == index)
 p.item = item;

Node class:

public class Node<T>

 T item;
 Node<T> next;

When I go to run my code against some test code that I have, it fails the test.

Test Code:

LList<String> b = new LList<String>();
b.add("Hello");
b.add("Bye");
b.set(0, "Bonjour");
assertEquals("Bonjour", b.get(0));

Failed test Reason: org.junit.ComparisonFailure: expected:<[Bonjour]> but was:<[Hello]>

(add(), size(), and get() methods are working correctly.)

So my question is, how do I get this to set the element correctly? From this code, and from why it's failing the test, it looks like it's not setting anything at all. If you need any extra information from me, do not hesitate to ask me. Appreciate the help. Thanks!

java list linked-list

share|improve this question

edited Mar 9 at 6:28

Yoshi24517

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

Node<X> p = new Node<X>();
if(index < 0 || index > size()-1)
 throw new Bonfire();

int count = 0;
while(count != index)
 p = p.next;
 count++;

if(count == index)
 p.item = item;

public class Node<T>

 T item;
 Node<T> next;

LList<String> b = new LList<String>();
b.add("Hello");
b.add("Bye");
b.set(0, "Bonjour");
assertEquals("Bonjour", b.get(0));

share|improve this question

edited Mar 9 at 6:28

Yoshi24517

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

share|improve this question

edited Mar 9 at 6:28

Yoshi24517

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

asked Mar 9 at 6:13

Yoshi24517Yoshi24517

1408

1 Answer
1

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oldest

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1

All I needed to do was change Node<X> p to make it Node<X> p = first;.

share|improve this answer

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

add a comment | 

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1

All I needed to do was change Node<X> p to make it Node<X> p = first;.

share|improve this answer

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

add a comment | 

1

All I needed to do was change Node<X> p to make it Node<X> p = first;.

share|improve this answer

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

add a comment | 

All I needed to do was change Node<X> p to make it Node<X> p = first;.

share|improve this answer

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

share|improve this answer

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408

answered Mar 9 at 6:25

Yoshi24517Yoshi24517

1408