School, 16.09.17, Item List example

Item class
===========
package myClasses;

public class Item {
    // object properties
    private String name;
    private double price;
    private int quentity;

    public Item(String name, double price) {
        this.name = name;
        this.price = price;
        this.quentity = 0;
    }

    public Item(String name, double price, int quentity) {
        super();
        this.name = name;
        this.price = price;
        this.quentity = quentity;
    }

    public Item(Item itm) {
        this.name = itm.name;
        this.price = itm.price;
        this.quentity = itm.quentity;
    }

    public String getName() {
        return name;
    }

    public boolean setName(String name) {
        if (name.length() >= 3) {
            this.name = name;
            return true;
        }
        return false;
    }

    public double getPrice() {
        return price;
    }

    public boolean setPrice(double price) {
        if (price >= 0) {
            this.price = price;
            return true;
        }

        return false;
    }

    public int getQuentity() {
        return quentity;
    }

    public boolean setQuentity(int quentity) {
        if (quentity >= 0) {
            this.quentity = quentity;
            return true;
        }

        return false;
    }

    @Override
    public String toString() {
        return "Item [name=" + name + ", price=" + price + ", quentity=" + quentity + "]";
    }

    public double getTotal() {
        return price * quentity;
    }

}


ItemList class
================
package myClasses;

public class ItemList {
    final private int MAX_SIZE = 20;

    private Item[] items;
    private int count;

    public ItemList() {
        items = new Item[MAX_SIZE];
        this.count = 0;
    }

    public boolean addItem(Item item) {
        if (count < items.length) {
            // this.items[count] = item;
            this.items[count] = new Item(item);
            count += 1;
            return true;
        }

        return false;
    }

    public void removeItem(Item item) {
        int p = findPlace(item);
        // if item exists in list
        if (p > -1) {
            for (int i = p + 1; i < count; i += 1) {
                items[i - 1] = items[i];
            }
            count -= 1;
        }
    }

    private int findPlace(Item item) {
        // to be checked later
        for (int i = 0; i < count; i += 1) {
            if (items[i].getName().equals(item.getName())) {
                return i;
            }
        }

        // not found
        System.out.println(item.getName() + " item not found");
        return -1;
    }

    public void removeAll() {
        count = 0;
    }

    public double getTotal() {
        double total = 0;
        for (int i = 0; i < count; i += 1) {
            total += items[i].getTotal();
        }
        return total;
    }

    @Override
    public String toString() {
        String res = "Items List" + "\n---------------------\n";
        for (int i = 0; i < count; i += 1)
            res += items[i] + "\n";

        res += "---------------------\n";
        res += "Total price is " + getTotal() + "\n";
        return res;
    }

}

Tester class
=============
package Tester;

import myClasses.Item;
import myClasses.ItemList;

public class Testrer {

    public static void main(String[] args) {
        Item choc = new Item("Choclate", 7.90, 3);
        Item bamba = new Item("Bamba", 2.80, 10);
        Item bisli = new Item("Bisli", 1.60, 4);

        ItemList karawanList = new ItemList();

        karawanList.addItem(choc);
        karawanList.addItem(bamba);
        karawanList.addItem(bisli);

        System.out.println(karawanList);

        // remove bamba
        karawanList.removeItem(bamba);
        System.out.println("after removing item: " + karawanList);
        // remove all items

        choc.setPrice(4.20);
        choc.setQuentity(15);

        System.out.println(choc);
        System.out.println(karawanList);

        karawanList.removeAll();
        System.out.println(karawanList);

        ItemList lolo = new ItemList();
        lolo.addItem(choc);
        System.out.println("lolo list is" + lolo);
    }
}