inser4.java

public class LinkedList {
    Node headNode;

    /*
    * insert method
    * @value - integer
    * */
    public void insert(int value){
      Node newNode=new Node();
      
      newNode.value=value;
      
      if(headNode==null){
        
        headNode=newNode; 
        
      }else{
        //4.1
         Node n=headNode;

            //4.2
            while (n.nextNode!=null){
                //4.3
                n=n.nextNode;
            }
            //4.4
            n.nextNode=newNode;
      }
      
    }
}

//for understanding i added Node Class below
public class Node {
    int value;
    Node nextNode;
}