item main menu

//node class
/**
 * Created by yst on 19/03/2016.
 */
public class Node {
    Object data;
    Node next;

    public Node(Object obj) {
        this.data = obj;
    }
}
//linked list
/**
 * Created by yst on 19/03/2016.
 */
public class LinkedList {
    public Node first = null;
    public Node current = null;
    public Node last = null;

    public LinkedList() {
    }

    public void insertAtBack(Object item) {
        Node newNode = new Node(item);
        if(this.first == null) {
            this.first = newNode;
            this.last = newNode;
        } else {
            this.last.next = newNode;
            this.last = newNode;
        }

    }

    public Object removeFromFront() {
        Object removeData = null;
        if(this.first == null) {
            return removeData;
        } else {
            removeData = this.first.data;
            if(this.first == this.last) {
                this.first = null;
                this.last = null;
            } else {
                this.first = this.first.next;
            }

            return removeData;
        }
    }

    public Object removeFromBack() {
        Object removeData = null;
        if(this.first == null) {
            return removeData;
        } else {
            removeData = this.last.data;
            if(this.first == this.last) {
                this.first = null;
                this.last = null;
            } else {
                for(this.current = this.first; this.current.next != this.last; this.current = this.current.next) {
                    ;
                }

                this.last = this.current;
                this.last.next = null;
            }

            return removeData;
        }
    }

    public Object getFirst() {
        if(this.first == null) {
            return null;
        } else {
            this.current = this.first;
            return this.current.data;
        }
    }
    public Object getNext() {
        if (current == last) {
            return null;
        } else {
            current = current.next;
            return current.data;
        }
    }
}
//ITEM

/**
 * Created by yst on 19/03/2016.
 */
public class ITEM {

    private String type;
    private String size;
    private double price;

    //default constructor
    public ITEM(){
        type=" ";
        size=" ";
        price=0.0;
    }
    //normal constructor
    public ITEM (String t,String s,double p){
        type = t;
        size = s;
        price = p;
    }
    //mutator
    public void mutator(String T,String S,double P){
        type=T;
        size=S;
        price=P;
    }
    //getter
    public String getType(){
        return type;
    }
    public String getSize(){
        return size;
    }
    public double getPrice(){
        return price;
    }
    //toString
    public String toString(){
            return type + "\t        " + size + "\t      RM " + price+"0";
    }


}
//app
/**
 * Created by yst on 11/03/2016.
 */
import java.util.*;
public class APP {
    public static void main(String[] args){
        String username=" ",password=" ";
        Scanner input=new Scanner(System.in);
        System.out.print("USERNAME :" );
        username=input.next();
        System.out.print("PASSWORD :");
        password=input.next();

        //Arraylist for login
        ArrayList<login> a =new ArrayList<login>();

        //adding object to a arraylist
        a.add(new login("balqis","hanis"));
        a.add(new login("safuan","alane"));
        a.add(new login("abah","caah"));

        //username and password will be search according to the index respectively
        for(int counter=0;counter<a.size();counter++){
            if((a.get(counter).getUsername().equalsIgnoreCase(username))&&(a.get(counter).getPassword().equalsIgnoreCase(password))) {
                System.out.println("Sucessfully Login\n");
                String type;
                int size;
                double price;

                LinkedList item=new LinkedList();

                item.insertAtBack(new ITEM("add category","add size  ",add price double format));
                 item.insertAtBack(new ITEM("add category","add size  ",add price double format));
                //add as much as you want and use your logic

                int count=0;
                ITEM data=(ITEM) item.getFirst();
                while(data!=null){
                    if (count==0){
                        //main menu format edit if you wanted to do so
                        System.out.println("   TYPE        " + "         SIZE " + "          PRICE ");
                        count++;
                    }
                    System.out.println(data);
                    data=(ITEM) item.getNext();
                }
            }
                break;
            }
        }

}
//add any other logic and syntax to make main menu easy for the end user