diff --git a/foreksempel/src/main/java/of3/lf/Item.java b/foreksempel/src/main/java/of3/lf/Item.java
new file mode 100644
index 0000000000000000000000000000000000000000..790c9bc78fc3e4d1e66172cf1cbef6c3e828c19e
--- /dev/null
+++ b/foreksempel/src/main/java/of3/lf/Item.java
@@ -0,0 +1,36 @@
+package of3.lf;
+
+public class Item {
+
+ // Felter / Tilstand
+ private String name;
+ private double price;
+ private final String category;
+ private String barcode;
+
+ // Konstruktør
+ public Item(String name, double price, String category, String barcode) {
+ this.name = name;
+ this.price = price;
+ this.category = category;
+ this.barcode = barcode;
+ }
+
+ // Gettere
+ public String getName() {
+ return name;
+ }
+
+ public double getPrice() {
+ return price;
+ }
+
+ public String getCategory() {
+ return category;
+ }
+
+ public String getBarcode() {
+ return barcode;
+ }
+
+}
diff --git a/foreksempel/src/main/java/of3/lf/SelfServiceCheckout.java b/foreksempel/src/main/java/of3/lf/SelfServiceCheckout.java
new file mode 100644
index 0000000000000000000000000000000000000000..a7d66da59c9ac07463d80bd059d07b3c2355dea9
--- /dev/null
+++ b/foreksempel/src/main/java/of3/lf/SelfServiceCheckout.java
@@ -0,0 +1,254 @@
+package of3.lf;
+
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+
+public class SelfServiceCheckout {
+
+ public static final Collection<String> days = Arrays.asList("mon", "tue", "wed", "thu", "fri", "sat", "sun");
+
+ // Felter / Tilstand - del 1
+ private String day;
+ private boolean adminMode;
+ private String password;
+ private String phoneNumber;
+ private List<Item> shoppingCart;
+
+ public SelfServiceCheckout(String day, String password) {
+ validateDay(day);
+ validatePassword(password);
+ this.day = day;
+ this.password = password;
+ this.adminMode = false;
+ this.shoppingCart = new ArrayList<>();
+ }
+
+ private void validateDay(String day) {
+ if (!days.contains(day)) {
+ throw new IllegalArgumentException("Invalid weekday");
+ }
+ }
+
+ // Del 4 a)
+ public void removeFromCart(int index) {
+ if (!this.adminMode) {
+ throw new IllegalStateException("Illegal operation");
+ }
+ this.shoppingCart.remove(index);
+ }
+
+ // Del 2 a)
+ public void activateAdminMode(String password) {
+ if (this.adminMode) {
+ throw new IllegalStateException("Admin mode is already active!");
+ }
+ if (this.password.equals(password)) {
+ this.adminMode = true;
+ } else {
+ throw new IllegalArgumentException("Wrong password, permission denied");
+ }
+ }
+
+ public void registerPhoneNumber(String phoneNumer) {
+ if (this.phoneNumber != null) {
+ throw new IllegalStateException("Illegal operation");
+ }
+ if (isValidPhoneNumber(phoneNumer)) {
+ this.phoneNumber = phoneNumer;
+ } else {
+ throw new IllegalArgumentException("Not a valid phone number, please re-enter.");
+ }
+ }
+
+ // Del 4 b)
+ public boolean isMember() {
+ return phoneNumber != null;
+ }
+
+ // Del 3
+ public void scanItem(Item item) {
+ this.shoppingCart.add(item);
+ System.out.println(item.getName() + ": " + item.getPrice() + "kr");
+ }
+
+ public void scanItems(List<Item> shoppingCart) {
+ for (Item i : shoppingCart) {
+ scanItem(i);
+ }
+ }
+
+ // Del 5
+ private double getDiscountForItem(Item item) {
+ // Funksjonaliteten her skal vi utvide senere...
+ if (isMember() && item.getCategory().equals("taco")) {
+ if (day == "fri" || day == "sat") {
+ return 0.3;
+ }
+ }
+ return 0.0;
+ }
+
+ private double getPriceForItem(Item item) {
+ return item.getPrice() - (item.getPrice() * this.getDiscountForItem(item));
+ }
+
+ // Del 6
+ private double getMVAForItem(Item item) {
+ return this.getPriceForItem(item) * 0.15;
+ }
+
+ private double getPriceWithoutMVAForItem(Item item) {
+ return this.getPriceForItem(item) - this.getMVAForItem(item);
+ }
+
+ // Del 7
+ private double getTotalPriceForCart() {
+ double sum = 0;
+ for (Item item : shoppingCart) {
+ sum += this.getPriceForItem(item);
+ }
+ return sum;
+ }
+
+ private double getTotalMVAForCart() {
+ double totalMVA = 0;
+ for (Item item : shoppingCart) {
+ totalMVA += this.getMVAForItem(item);
+ }
+ return totalMVA;
+ }
+
+ // Del 2 b)
+ private boolean validatePassword(String password) {
+ // Eventuelt kan man her bare bruke
+ // password.matches("^(?=.*[0-9])(?=.*[a-zA-Z]).{6,10}$");
+ // Dette uttrykket kalles RegEx og kan være noe utfordrende å skrive på egenhånd
+ // Det finnes dog en rekke gode ressurser på nett hvis man søker litt rundt.
+ // Nedenfor har jeg beskrevet en mer "manuell" metode som løses med vanlig
+ // Java-kode.
+ if (password.length() < 6 || password.length() > 10) {
+ return false;
+ }
+ char[] chars = password.toCharArray();
+ boolean containsNumeric = false;
+ boolean containsAlphabetic = false;
+ for (char c : chars) {
+ if (Character.isDigit(c)) {
+ containsNumeric = true;
+ } else if (Character.isAlphabetic(c)) {
+ containsAlphabetic = true;
+ }
+ }
+ return containsAlphabetic && containsNumeric;
+ }
+
+ private boolean isValidPhoneNumber(String phoneNumber) {
+ String cleanedPhoneNumber = phoneNumber.replaceAll("\\s", "");
+ if (cleanedPhoneNumber.startsWith("00479") || cleanedPhoneNumber.startsWith("00474")) {
+ if (cleanedPhoneNumber.length() != 12) {
+ return false;
+ }
+ } else if (cleanedPhoneNumber.startsWith("+479") || cleanedPhoneNumber.startsWith("+474")) {
+ if (cleanedPhoneNumber.length() != 11) {
+ return false;
+ }
+ } else {
+ return false;
+ }
+
+ // Her kunne man også fjernet første tegn i charArrayen og sjekket resten
+ // Dette kan vi gjøre siden vi allerede har validert de første 4-5 tegnene
+ char[] chars = cleanedPhoneNumber.toCharArray();
+ boolean firstIndex = true;
+ for (char c : chars) {
+ if (!Character.isDigit(c)) {
+ if (c != '+' && !firstIndex) {
+ return false;
+ }
+ firstIndex = false;
+ }
+ }
+
+ return true;
+ }
+
+ // Del 9
+ private int getNumberOfEqualItemsInCart(String barcode) {
+ int equalItems = 0;
+ for (Item item : shoppingCart) {
+ if (item.getBarcode().equals(barcode)) {
+ equalItems++;
+ }
+ }
+ return equalItems;
+ }
+
+ // Del 8 & 9
+ @Override
+ public String toString() {
+ List<String> uniqueBarcodes = new ArrayList<>();
+ String receipt = """
+ --------------------------------------
+ Hva Pris MVA Total
+ """;
+ for (Item item : shoppingCart) {
+ // ArrayList.contains bruker object.equals internt,
+ // Som gjør at vi sammenligner strenger på riktig måte
+ if (!uniqueBarcodes.contains(item.getBarcode())) {
+ int count = this.getNumberOfEqualItemsInCart(item.getBarcode());
+ receipt += String.format(
+ """
+ %dx %s\t%.2f\t%.2f\t%.2f
+ """,
+ count,
+ item.getName(),
+ this.getPriceWithoutMVAForItem(item),
+ this.getMVAForItem(item),
+ this.getPriceForItem(item) * count);
+ uniqueBarcodes.add(item.getBarcode());
+ }
+ }
+ receipt += String.format(
+ """
+ --------------------------------------
+ Total MVA %.2f
+ Total %.2f
+ Takk for at du handlet
+ hos oss i OOP!
+ --------------------------------------
+ """,
+ this.getTotalMVAForCart(),
+ this.getTotalPriceForCart());
+ return receipt;
+ }
+
+ // main-metode for å teste koden
+ public static void main(String[] args) {
+
+ SelfServiceCheckout checkout = new SelfServiceCheckout("fri", "passord123");
+
+ Item tomato = new Item("Tomat", 5, "fruit", "|| ||| | |||| |");
+ Item cheese = new Item("Norvegia", 90, "diary", "| | ||||| | |||");
+ Item cheese2 = new Item("Norvegia", 90, "diary", "| | ||||| | |||");
+ Item tortillas = new Item("Lefser", 15, "taco", " | || | || ||||");
+ Item groundMeat = new Item("Kjøttdeig", 29.99, "taco", "|||| || | |||||");
+
+ checkout.scanItem(tomato);
+ checkout.scanItem(cheese);
+ checkout.scanItem(tortillas);
+ checkout.scanItem(groundMeat);
+ checkout.scanItem(cheese2);
+
+ System.out.println(checkout);
+
+ checkout.registerPhoneNumber("004742345678");
+ checkout.activateAdminMode("passord123");
+ checkout.removeFromCart(0);
+
+ System.out.println(checkout);
+
+ }
+
+}