fetching_node.java

//fetching node from the provided key
class Node
{
 Node next;
 int data;
 
 Node(int d)
 {
 data=d;
 next=null;
 }
}

public class Fetchnode
{
 Node head;
 public void insert(int element)
 {
 Node n = new Node(element);
 n.next=head;
 head = n;
 }
 
 public int fetch(int key)
 {
 Node present = head;
 int count=0;
 
 while(present!=null)
 {
 if(count==key)
 return(present.data);
 count++;
 present=present.next;
 }
 assert(false); //wrong choice
 //assert statement is used to declare an expected boolean condition in a program
 return 0;
 
 }
 
 public static void main(String args[]) 
 { 
 Fetchnode fl = new Fetchnode(); 
 fl.insert(20); 
 fl.insert(645); 
 fl.insert(1436); 
 fl.insert(35); 
 fl.insert(23); 
 System.out.println("Element at index 2 is "+fl.fetch(2)); 
 } 
}