package linklist;
import java.util.Scanner;
/* Class Node */
class Node1
{
protected int data;
protected Node1 link;
/* Constructor */
public Node1()
{
link = null;
data = 0;
}
/* Constructor */
public Node1(int d,Node1 n)
{
data = d;
link = n;
}
/* Function to set link to next Node */
public void setLink(Node1 n)
{
link = n;
}
/* Function to set data to current Node */
public void setData(int d)
{
data = d;
}
/* Function to get link to next node */
public Node1 getLink()
{
return link;
}
/* Function to get data from current Node */
public int getData()
{
return data;
}
}
class linkedList1
{
protected Node1 start;
protected Node1 end ;
public int size ;
/* Constructor */
public linkedList1()
{
start = null;
end = null;
size = 0;
}
/* Function to check if list is empty */
public boolean isEmpty()
{
return start == null;
}
/* Function to get size of list */
public int getSize()
{
return size;
}
/* Function to insert an element at begining */
public void insertAtStart(int val)
{
Node1 nptr = new Node1(val, null);
size++ ;
if(start == null)
{
start = nptr;
end = start;
}
else
{
nptr.setLink(start);
start = nptr;
}
}
/* Function to insert an element at end */
public void insertAtEnd(int val)
{
Node1 nptr = new Node1(val,null);
size++ ;
if(start == null)
{
start = nptr;
end = start;
}
else
{
end.setLink(nptr);
end = nptr;
}
}
public void display()
{
System.out.print("\nSingly Linked List = ");
if (size == 0)
{
System.out.print("empty\n");
return;
}
if (start.getLink() == null)
{
System.out.println(start.getData() );
return;
}
Node1 ptr = start;
System.out.print(start.getData()+ "->");
ptr = start.getLink();
while (ptr.getLink() != null)
{
System.out.print(ptr.getData()+ "->");
ptr = ptr.getLink();
}
System.out.print(ptr.getData()+ "\n");
}
}
/* Class SinglyLinkedList */
public class create_list
{
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
/* Creating object of class linkedList */
linkedList1 list = new linkedList1();
System.out.println("Singly Linked List Test\n");
char ch;
/* Perform list operations */
do
{
System.out.println("\nSingly Linked List Operations\n");
System.out.println("1. insert at begining");
System.out.println("5. check empty");
System.out.println("6. get size");
int choice = scan.nextInt();
switch (choice)
{
case 1 :
System.out.println("Enter integer element to insert");
list.insertAtStart( scan.nextInt() );
break;
case 5 :
System.out.println("Empty status = "+ list.isEmpty());
break;
case 6 :
System.out.println("Size = "+ list.getSize() +" \n");
break;
default :
System.out.println("Wrong Entry \n ");
break;
}
/* Display List */
list.display();
System.out.println("\nDo you want to continue (Type y or n) \n");
ch = scan.next().charAt(0);
} while (ch == 'Y'|| ch == 'y');
}
}
