Insertion Node in the Linkelist.

In this post, methods to insert a new node in linked list are discussed. A node can be added in three ways
1) At the front of the linked list
2) After a given node.
3) At the end of the linked list

public class Linkedlist {
 Node head;
 class Node{
  int data;
  Node next;
  Node(int d){
   data =d;
   next=null;
  } 
 }

// INSERT THE NODE AT THE BEGIN OF LINKEDLIST.

 
 public void insertAtfront(int new_data){
  
//  Node temp = head;
  Node new_node = new Node(new_data);
  new_node.next = head;
  head = new_node;
  
 } 

// INSERT THE NODE AT THE GIVEN POSITION IN LINKEDLIST.

 public void insertAtGiven(Node prev_node,int new_data)
 {
  if(prev_node == null){
   System.out.print("previous node can't be null");
   return;
   
  }
  Node new_node = new Node(new_data);
  new_node.next = prev_node.next;
  prev_node.next = new_node;
 }

// INSERT THE NODE  AT THE END OF THE LINKEDLIST.  

 public void insertAtEnd(int new_data){
  
  Node new_node = new Node(new_data);
  new_node.next = null;
  Node last = head;
  while(last.next!=null){
   last = last.next;
  
  }
  last.next= new_node;
  return;
  
 }

// TRAVERSING THE ELEMENT OF LINKEDLIST

 
 public void showlist(){
  Node tnode= head;
  while(tnode!=null){
   System.out.print(tnode.data+" ");
   tnode = tnode.next;
  }
 }

 // MAIN FUNCTION 

 public static void main(String ...args)  
{  
list.insertAtfront(10); 
 list.insertAtfront(12);
list.insertAtfront(14); 
 list.insertAtfront(16);
list.insertAtfront(18); 
 list.insertAtfront(19);
list.insertAtGiven(12,20);
list.insertAtGiven(20,22);
  list.insertAtEnd(24); 
 list.showlist();
 } 
}