Linked List Implementation (Asiatik#312)

LL.java

@@ -0,0 +1,129 @@
+class Node
+{
+	private int data;
+	public Node next;
+
+
+	 public Node(int data)
+	 {
+       this.data=data;
+       this.next=null;
+	 }
+	 public int getData()
+	 {
+      return this.data;
+	 }
+}
+
+class LinkedList
+{
+	private Node head;
+	private Node tail;
+	public int size;
+
+	public LinkedList()
+	{
+		head=null;
+		tail=null;
+		size=0;
+	}
+
+	public boolean isEmpty()
+	{
+		return head==tail;
+	}
+
+	public int getSize()
+	{
+		return size;
+	}
+
+	 public void insertAtStart(int val)
+    {
+        Node newNode = new Node(val);    
+        size++ ;    
+        if(head == null) 
+        {
+            head = newNode;
+            tail = head;
+        }
+        else 
+        {
+            newNode.next=head;
+            head=newNode;
+        }
+    }
+
+    public void insertAtLast(int val)
+    {
+    	Node newNode=new Node(val);
+    	size++;
+    	if(head==null)
+    	{
+    		head=newNode;
+    		tail=newNode;
+    	}
+    	else
+    	{
+    		tail.next=newNode;
+    		tail=newNode;
+    	}
+    }
+	public void insertAtPos(int val, int pos)
+	{
+		Node newNode= new Node(val);
+		Node temp=head;
+		pos=pos-1;
+		for(int i=0;i<size;i++)
+		{
+			if(i==pos)
+			{
+				Node temp1=temp.next;
+				temp.next=newNode;
+				newNode.next=temp1;
+				break;
+			}
+			temp=temp.next;
+		}
+		size++;
+	}
+
+	public void delete(int pos)
+	{
+		 if (pos == 1) 
+        {
+            head=head.next;
+            size--; 
+            return ;
+        }
+        if (pos == size) 
+        {
+            Node prev = head;
+            Node temp = head;
+            while (temp.next!=null)
+            {
+                prev=temp;
+                temp=temp.next;
+            }
+            tail=prev;
+            prev.next=null;
+            size --;
+            return;
+        }
+        Node ptr = head;
+        pos = pos - 1 ;
+        for (int i = 1; i < size - 1; i++) 
+        {
+            if (i == pos) 
+            {
+                Node tmp = ptr.next;
+                tmp = tmp.next;
+                ptr.next=temp;
+                break;
+            }
+            ptr = ptr.next;
+        }
+        size-- ;
+	}
+
+}