Merge pull request #75 from earngpi/master

added class for Palindrome and re-edited SinglyLinkedList

Misc/Palindrome.java

@@ -0,0 +1,16 @@
+class Palindrome {
+	
+	public String reverseString(String x){ //*helper method
+		String output = "";
+		for(int i=x.length()-1; i>=0; i--){
+			output += x.charAt(i); //addition of chars create String
+		}
+		return output;
+	}
+	
+	
+	public Boolean isPalindrome(String x){ //*palindrome method, returns true if palindrome
+		return (x.equalsIgnoreCase(reverseString(x)));
+	}
+  
+  }

data_structures/Lists/SinglyLinkedList.java

@@ -14,7 +14,7 @@
  */
 class SinglyLinkedList{
 	/**Head refered to the front of the list */
-	private LinkForLinkedList head;
+	private Node head;
 
 	/**
 	 * Constructor of SinglyLinkedList
@@ -29,9 +29,9 @@ class SinglyLinkedList{
 	 * @param x Element to be added
 	 */
 	public void insertHead(int x){
-		LinkForLinkedList newLink = new LinkForLinkedList(x); //Create a new link with a value attached to it
-		newLink.next = head; 		//Set the new link to point to the current head
-		head = newLink; 			//Now set the new link to be the head
+		Node newNode = new Node(x); //Create a new link with a value attached to it
+		newNode.next = head; 		//Set the new link to point to the current head
+		head = newNode; 			//Now set the new link to be the head
 	}
 
 	/**
@@ -39,8 +39,8 @@ class SinglyLinkedList{
 	 * 
 	 * @return The element deleted
 	 */
-	public LinkForLinkedList deleteHead(){
-		LinkForLinkedList temp = head;
+	public Node deleteHead(){
+		Node temp = head;
 		head = head.next; //Make the second element in the list the new head, the Java garbage collector will later remove the old head
 		return temp;
 	}
@@ -58,9 +58,9 @@ class SinglyLinkedList{
 	 * Prints contents of the list
 	 */
 	public void display(){
-		LinkForLinkedList current = head;
+		Node current = head;
 		while(current!=null){
-			current.displayLink();
+			System.out.print(current.getValue()+" ");
 			current = current.next;
 		}
 		System.out.println();
@@ -96,26 +96,26 @@ class SinglyLinkedList{
  * @author Unknown
  *
  */
-class LinkForLinkedList{
+class Node{
 	/** The value of the node */
 	public int value;
 	/** Point to the next node */
-	public LinkForLinkedList next; //This is what the link will point to
+	public Node next; //This is what the link will point to
 
 	/**
 	 * Constructor
 	 * 
 	 * @param valuein Value to be put in the node
 	 */
-	public LinkForLinkedList(int valuein){
+	public Node(int valuein){
 		value = valuein;
 	}
 
 	/**
-	 * Prints out the value of the node
+	 * Returns value of the node
 	 */
-	public void displayLink(){
-		System.out.print(value+" ");
+	public int getValue(){
+		return value;
 	}
 
-}
+}