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первый коммит #1

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2 changes: 2 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
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# Пустой репозиторий для работы с Java кодом в Android Studio
Первая java программа из андроид студии для практикума.
добавлен второй коммит и второй пулреквест
57 changes: 57 additions & 0 deletions src/main/java/BillCalc.java
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import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.List;

public class BillCalc {
private final List<String> items;
private BigDecimal totalCost;
private BigDecimal totalCostPerPerson;
private final BigDecimal persons;

public BillCalc(int persons) {
this.items = new ArrayList<>();
this.totalCost = BigDecimal.valueOf(0.00);
this.totalCostPerPerson = BigDecimal.valueOf(0.00);
this.persons = BigDecimal.valueOf(persons);
}

public void addItem(String itemName, String price) {
BigDecimal itemPrice = new BigDecimal(price.trim()).setScale(2, RoundingMode.HALF_UP);
String item = itemName + ", " + itemPrice;
items.add(item);
totalCost = totalCost.add(itemPrice);
totalCostPerPerson = totalCost.divide(persons, RoundingMode.HALF_UP);
}

public void printTotal() {
System.out.println("Количество посетителей: " + persons.setScale(0, RoundingMode.DOWN));
System.out.println("Общая сумма счета: " + totalEnding(totalCost));
System.out.println("Каждый посетитель должен заплатить: " + totalEnding(totalCostPerPerson));
System.out.println("\nВсе позиции меню: ");
for (int i = 0; i < items.size(); i++) {
String name = items.get(i).split(",")[0];
BigDecimal price = new BigDecimal(items.get(i).split(", ")[1]);
System.out.println((i+1) + ". " + name + " - " + totalEnding(price));
}
}

private String totalEnding(BigDecimal val) {
double rub = val.setScale(0, RoundingMode.DOWN).doubleValue();
double kop = val.multiply(BigDecimal.valueOf(100)).setScale(0, RoundingMode.DOWN).doubleValue() % 100;

String endRub;
if (rub % 100 > 10 && rub % 100 < 15) endRub = "рублей";
else if (rub % 10 > 1 && rub % 10 < 5) endRub = "рубля";
else if (rub % 10 == 1) endRub = "рубль";
else endRub = "рублей";

String endKop;
if (kop > 10 && kop < 15) endKop = "копеек";
else if (kop % 10 > 1 && kop % 10 < 5) endKop = "копейки";
else if (kop % 10 == 1) endKop = "копейка";
else endKop = "копеек";

return String.format("%.0f %s %.0f %s", rub, endRub, kop, endKop);
}
}
80 changes: 79 additions & 1 deletion src/main/java/Main.java
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import java.util.Scanner;

public class Main {
public static int customers = 0;
public static String[] strings = {
"Привет. Это калькулятор счета.",
"Введите КОЛ-ВО человек (или 'завершить' для выхода):",
"Неверно: Должно быть целое число. 1 < ЧИСЛО < 1000",
"Товар успешно добавлен в счет",
"Введите НАЗВАНИЕ товара (или 'завершить' для выхода): ",
"Неверно: Название должно содержать текст (буквы, цифры, некоторые знаки препинания, кроме запятой)",
"Введите СТОИМОСТЬ товара (или 'завершить' для выхода): ",
"Неверно: 0.00 <= ЦЕНА < 150000000.00,\n Цена, это число не более 2х знаков после запятой."};

static BillCalc calculator;

public static void main(String[] args) {
System.out.println("Hello world!");
printString(0);

if (customersCount()) return;
calculator = new BillCalc(customers);
addItems();
calculator.printTotal();
}

public static boolean customersCount() {
Scanner scanner = new Scanner(System.in);

while (true) {
printString(1);
String input = scanner.nextLine();
if (input.trim().equalsIgnoreCase("завершить")) return true;
try {
customers = Integer.parseInt(input);
if (customers > 1 && customers < 1000) break;
} catch (NumberFormatException ignored) {}
printString(2);
}
return false;
}

public static void addItems() {
Scanner scanner = new Scanner(System.in);
boolean flag = true;
while (flag) {
printString(4);
String itemName = scanner.nextLine();
if (itemName.trim().equalsIgnoreCase("завершить")) flag = false;
else if (!isText(itemName)) {
printString(5);
continue;
}
while(flag) {
printString(6);
String itemPrice = scanner.nextLine();
if (itemPrice.trim().equalsIgnoreCase("завершить")) flag = false;
else if (isPrice(itemPrice)) {
calculator.addItem(itemName, itemPrice);
printString(3);
break;
}
else printString(7);
}
}
}

private static boolean isText(String value) {
return value.matches("[a-zA-Zа-яА-Я\\d\\p{Punct} &&[^,]]+");
}

private static boolean isPrice(String value) {
try {
double number = Double.parseDouble(value);
int decimalPlaces = value.indexOf('.') >= 0 ? value.length() - value.indexOf('.') - 1 : 0;
return number >= 0 && number < 150000000.00 && decimalPlaces <= 2;
} catch (NumberFormatException e) {
return false;
}
}

public static void printString(int arg) {
System.out.println(strings[arg]);
}
}

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