public class Item {

    public String name;
    public int itemNumber;
    public int qty;
    public double price;
    public Item next;

    public Item(String name, int itemNumber, int qty, double price) {

        this.name = name;//parameter dan variabel sama, solved by this
        this.itemNumber = itemNumber;
        this.qty = qty;
        this.price = price;
    }

    public void displayItem() {

        System.out.println(name + " " + itemNumber + " " + qty + " " + price);
        System.out.println();
    }

}