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| 1 | +import java.io.*; |
| 2 | +import java.nio.charset.StandardCharsets; |
| 3 | +import java.nio.file.Files; |
| 4 | +import java.nio.file.StandardOpenOption; |
| 5 | +import java.util.List; |
| 6 | +import java.util.Scanner; |
| 7 | + |
| 8 | +public class Josegs95 { |
| 9 | + public static void main(String[] args) { |
| 10 | + //Ficheros |
| 11 | + File file = new File("Josegs95.txt"); |
| 12 | + try(FileWriter out = new FileWriter(file); Scanner in = new Scanner(file)){ |
| 13 | + //FileWriter crea ya un archivo al crearse el objeto |
| 14 | + if (file.createNewFile()) |
| 15 | + System.out.println("Archivo creado: " + file.getName()); |
| 16 | + else |
| 17 | + System.out.println("No se ha creado el archivo " + file.getName() + " porque ya existía"); |
| 18 | + |
| 19 | + |
| 20 | + out.write("Nombre: Josegs95" + System.lineSeparator()); |
| 21 | + out.write("Edad: 29" + System.lineSeparator()); |
| 22 | + out.write("Lenguaje: Java" + System.lineSeparator()); |
| 23 | + out.flush(); |
| 24 | + |
| 25 | + while (in.hasNext()){ |
| 26 | + System.out.println(in.nextLine()); |
| 27 | + } |
| 28 | + |
| 29 | + } catch (IOException e) { |
| 30 | + throw new RuntimeException(e); |
| 31 | + } finally { |
| 32 | + if (file.delete()) |
| 33 | + System.out.println("Se ha borrado el archivo: " + file.getName()); |
| 34 | + else |
| 35 | + System.out.println("No se ha podido borrar el archivo: " + file.getName()); |
| 36 | + } |
| 37 | + |
| 38 | + //Reto |
| 39 | + System.out.println("\n"); |
| 40 | + retoFinal(); |
| 41 | + } |
| 42 | + |
| 43 | + static File file; |
| 44 | + public static void retoFinal(){ |
| 45 | + file = new File("Ventas.txt"); |
| 46 | + try(Scanner sc = new Scanner(System.in); |
| 47 | + FileWriter out = new FileWriter(file, true)){ |
| 48 | + |
| 49 | + loop: while(true){ |
| 50 | + showMenu(); |
| 51 | + System.out.print("Seleccione una opción: "); |
| 52 | + String option = sc.nextLine(); |
| 53 | + switch (option){ |
| 54 | + case "1": //Añadir |
| 55 | + addProduct(out, askProductDetails(sc)); |
| 56 | + break; |
| 57 | + case "2": //Consultar |
| 58 | + showProduct(sc); |
| 59 | + break; |
| 60 | + case "3": //Actualizar |
| 61 | + updateProduct(askProductDetails(sc)); |
| 62 | + break; |
| 63 | + case "4": //Eliminar |
| 64 | + deleteProduct(sc); |
| 65 | + break; |
| 66 | + case "5": //Calculo venta producto |
| 67 | + calculateProductSales(sc); |
| 68 | + break; |
| 69 | + case "6": //Calculo venta total |
| 70 | + calculateTotalSales(); |
| 71 | + break; |
| 72 | + case "7": //Salir |
| 73 | + break loop; |
| 74 | + default: |
| 75 | + System.out.println("Error. Debe elegir una opción válida (0-7)."); |
| 76 | + break; |
| 77 | + } |
| 78 | + } |
| 79 | + } catch (IOException e) { |
| 80 | + throw new RuntimeException(e); |
| 81 | + } finally { |
| 82 | + deleteFile(); |
| 83 | + } |
| 84 | + |
| 85 | + } |
| 86 | + |
| 87 | + private static void showMenu(){ |
| 88 | + System.out.println("------------------"); |
| 89 | + System.out.println("1- Añadir producto"); |
| 90 | + System.out.println("2- Consultar producto"); |
| 91 | + System.out.println("3- Actualizar producto"); |
| 92 | + System.out.println("4- Eliminar producto"); |
| 93 | + System.out.println("5- Calcular venta producto"); |
| 94 | + System.out.println("6- Calcular venta total"); |
| 95 | + System.out.println("7- Salir"); |
| 96 | + System.out.println("------------------"); |
| 97 | + } |
| 98 | + |
| 99 | + private static String[] askProductDetails(Scanner userInput){ |
| 100 | + System.out.print("Introduzca el nombre del producto: "); |
| 101 | + String product = userInput.nextLine().toLowerCase(); |
| 102 | + System.out.print("Introduzca la cantidad del producto: "); |
| 103 | + String quantity = userInput.nextLine().toLowerCase(); //Habría que controlar que es un número |
| 104 | + System.out.print("Introduzca el precio del producto: "); |
| 105 | + String price = userInput.nextLine().toLowerCase(); //Habría que controlar que es un número |
| 106 | + |
| 107 | + return new String[]{product, quantity, price}; |
| 108 | + } |
| 109 | + |
| 110 | + private static void addProduct(FileWriter outFile, String[] product) throws IOException { |
| 111 | + //Habría que controlar que el producto no existiera ya en el archivo |
| 112 | + String productLine = product[0] + ", " + product[1] + ", " + product[2] + System.lineSeparator(); |
| 113 | + |
| 114 | + outFile.write(productLine); |
| 115 | + outFile.flush(); |
| 116 | + } |
| 117 | + |
| 118 | + private static void showProduct(Scanner userInput) throws IOException { |
| 119 | + System.out.print("Introduzca el nombre del producto: "); |
| 120 | + String product = userInput.nextLine().toLowerCase(); |
| 121 | + |
| 122 | + String[] productDetails; |
| 123 | + |
| 124 | + List<String> lines = Files.readAllLines(file.toPath()); |
| 125 | + for (String line : lines){ |
| 126 | + productDetails = line.split(", "); |
| 127 | + if (productDetails[0].equals(product)){ |
| 128 | + System.out.println("Producto: " + productDetails[0] + ", Cantidad: " + productDetails[1] + ", Precio: " + productDetails[2]); |
| 129 | + return; |
| 130 | + } |
| 131 | + } |
| 132 | + |
| 133 | + System.out.println("No está registrado el producto: " + product); |
| 134 | + } |
| 135 | + |
| 136 | + private static void updateProduct(String[] product) throws IOException { |
| 137 | + String productLine = product[0] + ", " + product[1] + ", " + product[2]; |
| 138 | + |
| 139 | + List<String> lines = Files.readAllLines(file.toPath()); |
| 140 | + String[] productDetails; |
| 141 | + boolean isUpdated = false; |
| 142 | + for (int i = 0; i < lines.size(); i++){ |
| 143 | + productDetails = lines.get(i).split(", "); |
| 144 | + if (productDetails[0].equals(product[0])){ |
| 145 | + lines.set(i, productLine); |
| 146 | + isUpdated = true; |
| 147 | + break; |
| 148 | + } |
| 149 | + } |
| 150 | + |
| 151 | + if (isUpdated) |
| 152 | + System.out.println("Se ha actualizado el producto: " + product[0]); |
| 153 | + else |
| 154 | + System.out.println("El producto '" + product[0] + "' no está registrado."); |
| 155 | + |
| 156 | + Files.write(file.toPath(), lines, StandardCharsets.UTF_8); |
| 157 | + } |
| 158 | + |
| 159 | + private static void deleteProduct(Scanner userInput) throws IOException { |
| 160 | + System.out.print("Introduzca el nombre del producto: "); |
| 161 | + String product = userInput.nextLine().toLowerCase(); |
| 162 | + |
| 163 | + String[] productDetails; |
| 164 | + boolean isRemoved = false; |
| 165 | + |
| 166 | + List<String> lines = Files.readAllLines(file.toPath()); |
| 167 | + for (int i = 0; i < lines.size(); i++){ |
| 168 | + productDetails = lines.get(i).split(", "); |
| 169 | + if (productDetails[0].equals(product)){ |
| 170 | + lines.remove(i); |
| 171 | + isRemoved = true; |
| 172 | + break; |
| 173 | + } |
| 174 | + } |
| 175 | + |
| 176 | + if (isRemoved) |
| 177 | + System.out.println("Se ha borrado el producto: " + product); |
| 178 | + else |
| 179 | + System.out.println("El producto " + product + " no está registrado."); |
| 180 | + |
| 181 | + Files.write(file.toPath(), lines, StandardCharsets.UTF_8); |
| 182 | + } |
| 183 | + |
| 184 | + private static void calculateProductSales(Scanner userInput) throws IOException{ |
| 185 | + System.out.print("Introduzca el nombre del producto: "); |
| 186 | + String product = userInput.nextLine().toLowerCase(); |
| 187 | + |
| 188 | + List<String> lines = Files.readAllLines(file.toPath()); |
| 189 | + String[] productDetails; |
| 190 | + Double total = 0.0; |
| 191 | + for (String line : lines){ |
| 192 | + productDetails = line.split(", "); |
| 193 | + if (productDetails[0].equals(product)){ |
| 194 | + Integer quantity = Integer.parseInt(productDetails[1]); |
| 195 | + Double price = Double.parseDouble(productDetails[2]); |
| 196 | + total = quantity * price; |
| 197 | + break; |
| 198 | + } |
| 199 | + } |
| 200 | + |
| 201 | + if (total != 0) |
| 202 | + System.out.printf("Venta del producto %s de %.2f€.%n", product, total); |
| 203 | + else |
| 204 | + System.out.println("El producto " + product + " no está registrado."); |
| 205 | + } |
| 206 | + |
| 207 | + private static void calculateTotalSales() throws IOException { |
| 208 | + List<String> lines = Files.readAllLines(file.toPath()); |
| 209 | + String[] productDetails; |
| 210 | + Double total = 0.0; |
| 211 | + for (String line : lines){ |
| 212 | + productDetails = line.split(", "); |
| 213 | + Integer quantity = Integer.parseInt(productDetails[1]); |
| 214 | + Double price = Double.parseDouble(productDetails[2]); |
| 215 | + total += quantity * price; |
| 216 | + } |
| 217 | + |
| 218 | + System.out.printf("Venta total de %.2f€.%n", total); |
| 219 | + } |
| 220 | + |
| 221 | + private static void deleteFile(){ |
| 222 | + if (file.delete()) |
| 223 | + System.out.println("Se ha borrado el archivo: " + file.getName()); |
| 224 | + else |
| 225 | + System.out.println("No se ha podido borrar el archivo: " + file.getName()); |
| 226 | + } |
| 227 | +} |
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