Ejemplo con srp completado

Author: simonguzman

Roadmap/26 - SOLID SRP/java/simonguzman.java

@@ -3,9 +3,72 @@
 
 public class simonguzman {
     public static void main(String[] args) {
-        incorrectSrp();
+        //incorrectSrp();
+        correctSrp();
     }
+    /****************************** ejemplo con srp(Correcto) ******************************/
+    public static void correctSrp() {
+        InvoiceSrp invoice = new InvoiceSrp("Laptop",2,1200.00);
 
+        InvoicePrinter printer = new InvoicePrinter();
+        printer.printInvoice(invoice);
+
+        InvoiceSaver saver = new InvoiceSaver();
+        saver.saveToFile(invoice);
+    }
+    static class InvoiceSrp{
+        private String product;
+        private int quantity;
+        private double price;
+
+        public InvoiceSrp(){
+            
+        }
+
+        public InvoiceSrp(String product, int quantity, double price){
+            this.product = product;
+            this.quantity = quantity;
+            this.price = price;
+        }
+
+        public double calculateTotal(){
+            return quantity * price;
+        }
+
+        public String getProduct() {
+            return product;
+        }
+
+        public int getQuantity() {
+            return quantity;
+        }
+
+        public double getPrice() {
+            return price;
+        }
+    }
+
+    static class InvoicePrinter {
+        public void printInvoice(InvoiceSrp invoice){
+            System.out.println("Producto: "+invoice.getProduct());
+            System.out.println("Cantidad: "+invoice.getQuantity());
+            System.out.println("Precio: "+invoice.getPrice());
+            System.out.println("Total: "+invoice.calculateTotal());
+        }
+    }
+
+    static class InvoiceSaver{
+        public void saveToFile(InvoiceSrp invoice){
+            try (FileWriter writer = new FileWriter("invoice.txt")){
+                writer.write("Producto: " + invoice.getProduct() + "\n");
+                writer.write("Cantidad: " + invoice.getQuantity() + "\n");
+                writer.write("Precio unitario: " + invoice.getPrice() + "\n");
+                writer.write("Total: " + invoice.calculateTotal() + "\n");
+            } catch (Exception e) {
+                System.out.println("ERROR: no se pudo generar la factura..."+e.getMessage());
+            }
+        }
+    }
     /****************************** ejemplo sin srp(Incorrecto) ******************************/
     public static void incorrectSrp(){
         Invoice invoice = new Invoice("Laptop",2,1200.00);