From 2076a3ecc5e6859a9457b49e92399f5d252013f4 Mon Sep 17 00:00:00 2001
From: jrtechs <jeffery@jrtechs.net>
Date: Fri, 24 Aug 2018 18:57:22 -0400
Subject: [PATCH] Implemented a basic linked list

---
 src/main/java/net/jrtechs/www/App.java        |  13 +++
 .../net/jrtechs/www/DataStructures/IList.java |  57 ++++++++++
 .../DataStructures/LinkedList/LinkedList.java | 104 ++++++++++++++++++
 .../net/jrtechs/www/DataStructures/Node.java  |  44 ++++++++
 4 files changed, 218 insertions(+)
 create mode 100644 src/main/java/net/jrtechs/www/App.java
 create mode 100644 src/main/java/net/jrtechs/www/DataStructures/IList.java
 create mode 100644 src/main/java/net/jrtechs/www/DataStructures/LinkedList/LinkedList.java
 create mode 100644 src/main/java/net/jrtechs/www/DataStructures/Node.java

diff --git a/src/main/java/net/jrtechs/www/App.java b/src/main/java/net/jrtechs/www/App.java
new file mode 100644
index 0000000..6a6c180
--- /dev/null
+++ b/src/main/java/net/jrtechs/www/App.java
@@ -0,0 +1,13 @@
+package net.jrtechs.www;
+
+/**
+ * Hello world!
+ *
+ */
+public class App 
+{
+    public static void main( String[] args )
+    {
+        System.out.println( "Hello World!" );
+    }
+}
diff --git a/src/main/java/net/jrtechs/www/DataStructures/IList.java b/src/main/java/net/jrtechs/www/DataStructures/IList.java
new file mode 100644
index 0000000..31a93c3
--- /dev/null
+++ b/src/main/java/net/jrtechs/www/DataStructures/IList.java
@@ -0,0 +1,57 @@
+package net.jrtechs.www.DataStructures;
+
+
+/**
+ * Generic interface to define the behavior of
+ * lists.
+ *
+ * @param <E> generic for lists to store
+ *
+ * @author Jeffery Russell 8-24-18
+ */
+public interface IList<E>
+{
+    /**
+     * Adds an element to the list
+     *
+     * @param o element to get added
+     * @return whether element was edded
+     */
+    public boolean add(E o);
+
+
+    /**
+     * Determines if the list contains
+     * a certain element.
+     *
+     * @param o element to see if exists
+     * @return if element o is in the list
+     */
+    public boolean contains(E o);
+
+
+    /**
+     * Returns the size of the list.
+     *
+     * @return size of list
+     */
+    public int size();
+
+
+    /**
+     * Removes an element from the list
+     *
+     * @param index of element to remove
+     * @return element which is removed
+     */
+    public E remove(int index);
+
+
+    /**
+     * Returns element at a particular index
+     *
+     * @param index of desired element
+     * @return element at a certain index
+     */
+    public E get(int index);
+}
diff --git a/src/main/java/net/jrtechs/www/DataStructures/LinkedList/LinkedList.java b/src/main/java/net/jrtechs/www/DataStructures/LinkedList/LinkedList.java
new file mode 100644
index 0000000..fafab93
--- /dev/null
+++ b/src/main/java/net/jrtechs/www/DataStructures/LinkedList/LinkedList.java
@@ -0,0 +1,104 @@
+package net.jrtechs.www.DataStructures.LinkedList;
+
+
+import net.jrtechs.www.DataStructures.IList;
+import net.jrtechs.www.DataStructures.Node;
+
+/**
+ * @author Jeffery Russell
+ */
+public class LinkedList<E> implements IList<E>
+{
+    private Node<E> head;
+
+
+    private int size;
+
+
+    public LinkedList(E o)
+    {
+        this.head = new Node<>(o);
+        this.size = 1;
+    }
+
+
+    public LinkedList()
+    {
+        this.head = null;
+        this.size = 0;
+    }
+
+
+    public boolean add(E o)
+    {
+        Node current = this.head;
+        while(current != null)
+        {
+            current = current.getNext();
+        }
+        this.size++;
+
+        return false;
+    }
+
+
+    public boolean contains(E o)
+    {
+        Node current = this.head;
+        while(current != null)
+        {
+            if(current.equals(o))
+            {
+                return true;
+            }
+            current = current.getNext();
+        }
+        return false;
+    }
+
+
+    public int size()
+    {
+        return this.size;
+    }
+
+
+    public E remove(int index)
+    {
+        int count = 0;
+
+        Node<E> current = this.head;
+        Node<E> previous = null;
+        while(current != null)
+        {
+            if(count == index)
+            {
+                if(previous == null)
+                    this.head = current;
+                previous.setNext(current.getNext());
+                this.size--;
+                return current.getData();
+            }
+            previous = current;
+            current = current.getNext();
+        }
+        return null;
+    }
+
+
+    public E get(int index)
+    {
+        int count = 0;
+
+        Node<E> current = this.head;
+        while(current != null)
+        {
+            if(count == index)
+            {
+                return current.getData();
+            }
+            current = current.getNext();
+        }
+        return null;
+    }
+}
diff --git a/src/main/java/net/jrtechs/www/DataStructures/Node.java b/src/main/java/net/jrtechs/www/DataStructures/Node.java
new file mode 100644
index 0000000..acb33e2
--- /dev/null
+++ b/src/main/java/net/jrtechs/www/DataStructures/Node.java
@@ -0,0 +1,44 @@
+package net.jrtechs.www.DataStructures;
+
+/**
+ * @author Jeffery Russell 8-24-18
+ */
+
+
+/**
+ *
+ * @param <E>
+ */
+public class Node<E>
+{
+    private E data;
+
+    private Node<E> next;
+
+    public Node(E d)
+    {
+        this.data = d;
+        this.next = null;
+    }
+
+    public Node(E d, Node<E> newNext)
+    {
+        this.data = d;
+        this.next = newNext;
+    }
+
+    public Node<E> getNext()
+    {
+        return this.next;
+    }
+
+    public E getData()
+    {
+        return data;
+    }
+
+    public void setNext(Node<E> newNext)
+    {
+        this.next = newNext;
+    }
+}