LinkedList.java

package LINkedListst;

public class LinkedList {

    private class Node{
        int data;
        Node next;
    }

    private Node head;
    private Node tail;
    private int size;

    public void display(){
        System.out.println( " ========================== ");
        Node temp = this.head;
        while (temp != null){
            System.out.print(temp.data + " , ");
            temp=temp.next;

        }
        System.out.println();
        System.out.println("=======================");

    }

    public void addLast(int item){
        //create a new node
        Node nn = new Node();
        nn.data = item;
        nn.next = null;

        //attach
        if(this.size >= 1){
            this.tail.next = nn;
        }

        //object summary
        if (this.size == 0){
            this.head = nn;
            this.tail = nn;
            this.size++;

        }else {
            this.tail =nn;
            this.size++;

        }

        }

}