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September 10, 2011 14:01
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A linked list class implemented in Java
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/*============================================================================ | |
Name : LinkedList.java | |
Author : Eric Swanson | |
Date : Sep 7, 2011 | |
Version : | |
Description : | |
Copyright (C) 2011 Eric Swanson | |
This program is free software: you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation, either version 3 of the License, or | |
(at your option) any later version. | |
This program is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with this program. If not, see <http://www.gnu.org/licenses/>. | |
============================================================================*/ | |
class LinkedList | |
{ | |
//Class variables for the Linked List | |
private static Node head; | |
private static int numNodes; | |
public LinkedList(Object dat) | |
{ | |
head = new Node(dat); | |
} | |
public void addAtHead(Object dat) | |
{ | |
Node temp = head; | |
head = new Node(dat); | |
head.next = temp; | |
numNodes++; | |
} | |
public void addAtTail(Object dat) | |
{ | |
Node temp = head; | |
while(temp.next != null) | |
{ | |
temp = temp.next; | |
} | |
temp.next = new Node(dat); | |
numNodes++; | |
} | |
public void addAtIndex(int index, Object dat) | |
{ | |
Node temp = head; | |
Node holder; | |
for(int i=0; i < index-1 && temp.next != null; i++) | |
{ | |
temp = temp.next; | |
} | |
holder = temp.next; | |
temp.next = new Node(dat); | |
temp.next.next = holder; | |
numNodes++; | |
} | |
public void addAtIndex(int index, Node node) | |
{ | |
Node temp = head; | |
Node holder; | |
for(int i=0; i < index-1 && temp.next != null; i++) | |
{ | |
temp = temp.next; | |
} | |
holder = temp.next; | |
temp.next = node; | |
temp.next.next = holder; | |
numNodes++; | |
} | |
public void deleteAtIndex(int index) | |
{ | |
Node temp = head; | |
for(int i=0; i< index - 1 && temp.next != null; i++) | |
{ | |
temp = temp.next; | |
} | |
temp.next = temp.next.next; | |
numNodes--; | |
} | |
public void switchWithNext(int index) | |
{ | |
if(index != 0) | |
{ | |
Node bOne = find(index - 1); | |
Node one = find(index); | |
Node two = one.next; | |
one.next = two.next; | |
bOne.next = two; | |
two.next = one; | |
} | |
else | |
{ | |
Node one = find(index); | |
Node two = one.next; | |
head = two; | |
one.next = two.next; | |
two.next = one; | |
} | |
} | |
public static int find(Node n) | |
{ | |
Node t = head; | |
int index = 0; | |
while(t != n) | |
{ | |
index++; | |
t = t.next; | |
} | |
return index; | |
} | |
public static Node find(int index) | |
{ | |
Node temp=head; | |
for(int i=0; i<index; i++) | |
{ | |
temp = temp.next; | |
} | |
return temp; | |
} | |
public static void printList() | |
{ | |
Node temp = head; | |
while(temp != null) | |
{ | |
System.out.print(temp.data + ","); | |
temp = temp.next; | |
} | |
System.out.print("\n"); | |
} | |
public static int getSize() | |
{ | |
return numNodes; | |
} | |
class Node | |
{ | |
//Declare class variables | |
private Node next; | |
private Object data; | |
public Node(Object dat) | |
{ | |
data = dat; | |
} | |
public Object getData() | |
{ | |
return data; | |
} | |
} | |
} |
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@nileshparwan @tail-recursion @carlylou @jiachen247 @sak1122
Thank you for taking the time to read through this code and ask questions. The answer to all of these questions it that I was fresh out of college, had been using Java for barely a year and just didn't know any better.
I apologize for not getting to these questions sooner. When I get some time, I'll loop back and implement some of the feedback you all had. There have been some huge improvements in the past 11 years to Java, and my code could use some updating and documentation :)