insert3.java

public class LinkedList {
    Node headNode;

    /*
    * insert method
    * @value - integer
    * */
    public void insert(int value){
      Node newNode=new Node();
      
      //3.1
      newNode.value=value;//params
      
      //3.2
      if(headNode==null){
        headNode=newNode; 
      }
      
    }
}

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