S.R.P

SingleResponsibilityPrinciple/src/App.java

@@ -1,51 +1,5 @@
-import java.util.ArrayList;
-import java.util.List;
-
 public class App {
     public static void main(String[] args) throws Exception {
-        System.out.println("Hello!");
-
-        Stock( new Item("lolodmc69", 1000, 2));
-        Stock( new Item("jeo9", 1000, 2));
+        System.out.println("Hello, World!");
     }
 }
-class Item {
-    String code;
-    double price;
-    double quantity;
-
-    public Item(String code, double price, double quantity) {
-        this.code = code;
-        this.price = price;
-        this.quantity = quantity;
-    }
-
-}
-
-public static class Stock{
-    public Stock( List<Item> items){
-    items.add(new Item(code, price, quantity));
-    items
-    }  
-    public boolean isAvailableQuantity(Item x){
-        if (items.equals(x.code) && Items.quantity < x.quantity) {
-            return true;
-        }
-        return false;
-    }
-}
-
-class ShopingCart{
-    public ShopingCart( List<Item> cartItems){
-        cartItems.add(new Item(code, price, quantity));
-    }
-    public void removeFromCart(Item item){
-        if (cartItems.contains(item)) {
-            cartItems.remove(item);
-        }
-    }
-
-    public boolean add(Item item){
- return true;
-    }
-}

SingleResponsibilityPrinciple/src/Book.java

@@ -0,0 +1,16 @@
+public class Book {
+    String name;
+    String authorName;
+    int year;
+    int price;
+    String isbn;
+
+    public Book(String name, String authorName, int year, int price, String isbn) {
+        this.name = name;
+        this.authorName = authorName;
+        this.year = year;
+        this.price = price;
+        this.isbn = isbn;
+    }
+
+}

SingleResponsibilityPrinciple/src/InvoiceBestPractice.java

@@ -0,0 +1,62 @@
+public class InvoiceBestPractice {
+    private Book book;
+    private int quantity;
+    private double discountRate;
+    private double taxRate;
+    private double total;
+
+    public InvoiceBestPractice(Book book, int quantity, double discountRate, double taxRate, double total) {
+        this.book = book;
+        this.quantity = quantity;
+        this.discountRate = discountRate;
+        this.taxRate = taxRate;
+        this.total = total;
+    }
+
+    public double calculateTotal() {
+        double price = ((book.price - book.price * discountRate) * this.quantity);
+        double priceWithTaxes = price * (1 + taxRate);
+        return priceWithTaxes;
+    }
+
+    public Book getBook() {
+        return this.book;
+    }
+
+    public void setBook(Book book) {
+        this.book = book;
+    }
+
+    public int getQuantity() {
+        return this.quantity;
+    }
+
+    public void setQuantity(int quantity) {
+        this.quantity = quantity;
+    }
+
+    public double getDiscountRate() {
+        return this.discountRate;
+    }
+
+    public void setDiscountRate(double discountRate) {
+        this.discountRate = discountRate;
+    }
+
+    public double getTaxRate() {
+        return this.taxRate;
+    }
+
+    public void setTaxRate(double taxRate) {
+        this.taxRate = taxRate;
+    }
+
+    public double getTotal() {
+        return this.total;
+    }
+
+    public void setTotal(double total) {
+        this.total = total;
+    }
+
+}

SingleResponsibilityPrinciple/src/InvoicePersistence.java

@@ -0,0 +1,9 @@
+public class InvoicePersistence {
+    InvoiceBestPractice invoice;
+    public InvoicePersistence(InvoiceBestPractice invoice){
+        this.invoice = invoice;
+    }
+    public void saveToFile(String fileName){
+        //Creates a file with given name and writes the invoice
+    }
+}

SingleResponsibilityPrinciple/src/InvoicePrinter.java

@@ -0,0 +1,12 @@
+public class InvoicePrinter {
+    InvoiceBestPractice invoice;
+     public void InvoicePrinter(InvoiceBestPractice invoice){
+        this.invoice = invoice;
+    }
+    public void print(){
+        System.out.println(invoice.getQuantity() +" x "+invoice.getBook().name+" "+invoice.getBook().price+" $ ");
+        System.out.println("Discount Rate :" + invoice.getDiscountRate());
+        System.out.println("Tax Rate :" + invoice.getTaxRate());
+        System.out.println("Total :"+ invoice.getTotal());
+    }
+}

SingleResponsibilityPrinciple/src/InvoiceWorsePractice.java

@@ -0,0 +1,32 @@
+public class InvoiceWorsePractice {
+    // WORSE PRACTICE
+    private Book book;
+    private int quantity;
+    private double discountRate;
+    private double taxRate;
+    private double total;
+
+
+    public InvoiceWorsePractice(Book book, int quantity, double discountRate, double taxRate, double total) {
+        this.book = book;
+        this.quantity = quantity;
+        this.discountRate = discountRate;
+        this.taxRate = taxRate;
+        this.total = total;
+    }
+
+    public double calculateTotal(){
+        double price = ((book.price - book.price*discountRate)*this.quantity);
+        double priceWithTaxes = price * (1 + taxRate);
+        return priceWithTaxes;
+    }
+    public void printInvoice(){
+        System.out.println(quantity+" x "+book.name+" "+book.price+" $ ");
+        System.out.println("Discount Rate :" + discountRate);
+        System.out.println("Tax Rate :" + taxRate);
+        System.out.println("Total :"+ total);
+    }
+    public void saveToFile(String fileName){
+        //Creates a file with given name and writes the invoice
+    }
+}