@Test
public void groupByCurrencyUnitTest() {
Map<CurrencyUnit, List<MonetaryAmount>> groupBy =
currencies().collect(MonetaryFunctions.groupByCurrencyUnit());
assertEquals(3, groupBy.entrySet().size());
assertEquals(3, groupBy.get(BRAZILIAN_REAL).size());
assertEquals(3, groupBy.get(StreamFactory.DOLLAR).size());
assertEquals(3, groupBy.get(StreamFactory.EURO).size());
}
public static void main(String[] args) {
// getting CurrencyUnit by currency code and locale
CurrencyUnit euro = Monetary.getCurrency("EUR");
CurrencyUnit dollar = Monetary.getCurrency(Locale.US);
System.out.println("getting CurrencyUnit by currency code and locale");
System.out.printf("%s\n", euro);
System.out.printf("%s\n", dollar);
// getting MonetaryAmount by currency code and CurrencyUnit, without using Money (implementation
// class)
MonetaryAmount fiveEuro = Money.of(5, euro);
MonetaryAmount twelveEuro = Money.of(new BigDecimal("12"), euro);
MonetaryAmount tenDollar = Money.of(10, "USD");
MonetaryAmount tenPound =
Monetary.getDefaultAmountFactory().setNumber(10).setCurrency("GBP").create();
System.out.println();
System.out.println(
"getting MonetaryAmount by currency code and CurrencyUnit, without using Money (implementation class)");
System.out.printf("5 EUR: %s\n", fiveEuro);
System.out.printf("12 EUR: %s\n", twelveEuro);
System.out.printf("10 USD: %s\n", tenDollar);
System.out.printf("10 GBP: %s\n", tenPound);
// getting currency, the numeric amount and precision
MonetaryAmount amount = Money.of(123.45, euro);
System.out.println();
System.out.println("getting currency, the numeric amount and precision");
System.out.printf("123.45 EUR (currency): %s\n", amount.getCurrency());
System.out.printf("123.45 EUR (long): %s\n", amount.getNumber().longValue());
System.out.printf("123.45 EUR (number): %s\n", amount.getNumber());
System.out.printf(
"123.45 EUR (fractionNumerator): %s\n", amount.getNumber().getAmountFractionNumerator());
System.out.printf(
"123.45 EUR (fractionDenominator): %s\n",
amount.getNumber().getAmountFractionDenominator());
System.out.printf(
"123.45 EUR (amount, BigDecimal): %s\n", amount.getNumber().numberValue(BigDecimal.class));
// aritmetic
MonetaryAmount seventeenEuros = fiveEuro.add(twelveEuro);
MonetaryAmount sevenEuros = twelveEuro.subtract(fiveEuro);
MonetaryAmount tenEuro = fiveEuro.multiply(2);
MonetaryAmount twoPointFiveEuro = fiveEuro.divide(2);
System.out.println();
System.out.println("aritmetic");
System.out.printf("5 EUR + 12 EUR: %s\n", seventeenEuros);
System.out.printf("12 EUR - 5 EUR: %s\n", sevenEuros);
System.out.printf("5 EUR * 2: %s\n", tenEuro);
System.out.printf("5 EUR / 2: %s\n", twoPointFiveEuro);
// negative
MonetaryAmount minusSevenEuro = fiveEuro.subtract(twelveEuro);
System.out.println();
System.out.println("negative");
System.out.printf("5 EUR - 12 EUR: %s\n", minusSevenEuro);
// Note that MonetaryAmounts need to have the same CurrencyUnit to do mathematical operations
// this fails with: javax.money.MonetaryException: Currency mismatch: EUR/USD
// fiveEuro.add(tenDollar);
// comparing
System.out.println();
System.out.println("comparing");
System.out.printf("7€ < 10€: %s\n", sevenEuros.isLessThan(tenEuro));
System.out.printf("7€ > 10€: %s\n", sevenEuros.isGreaterThan(tenEuro));
System.out.printf("10 > 7€: %s\n", tenEuro.isGreaterThan(sevenEuros));
// rounding
MonetaryAmount euros = Money.of(12.34567, "EUR");
MonetaryAmount roundedEuros = euros.with(Monetary.getDefaultRounding());
System.out.println();
System.out.println("rounding");
System.out.printf("12.34567 EUR redondeados: %s\n", roundedEuros);
// streams
List<MonetaryAmount> amounts = new ArrayList<>();
amounts.add(Money.of(2, "EUR"));
amounts.add(Money.of(7, "USD"));
amounts.add(Money.of(18, "USD"));
amounts.add(Money.of(42, "USD"));
amounts.add(Money.of(13.37, "GBP"));
// filter
List<MonetaryAmount> onlyDollars =
amounts.stream().filter(MonetaryFunctions.isCurrency(dollar)).collect(Collectors.toList());
System.out.println();
System.out.println("filter");
System.out.printf("Solo USD: %s\n", onlyDollars);
List<MonetaryAmount> euroAndDollar =
amounts
.stream()
.filter(MonetaryFunctions.isCurrency(euro, dollar))
.collect(Collectors.toList());
System.out.printf("Solo EUR y USD: %s\n", euroAndDollar);
List<MonetaryAmount> greaterThanTenDollar =
amounts
.stream()
.filter(MonetaryFunctions.isCurrency(dollar))
.filter(MonetaryFunctions.isGreaterThan(tenDollar))
.collect(Collectors.toList());
System.out.printf("Solo USD y mayores que 10: %s\n", greaterThanTenDollar);
List<MonetaryAmount> sortedByAmount =
onlyDollars.stream().sorted(MonetaryFunctions.sortNumber()).collect(Collectors.toList());
System.out.printf("Solo USD y ordenados: %s\n", sortedByAmount);
// grouping
Map<CurrencyUnit, List<MonetaryAmount>> groupedByCurrency =
amounts.stream().collect(MonetaryFunctions.groupByCurrencyUnit());
System.out.println();
System.out.println("grouping");
System.out.printf("Agrupación por divisa: %s\n", groupedByCurrency);
// reduction
List<MonetaryAmount> euroAmounts = new ArrayList<>();
euroAmounts.add(Money.of(7.5, "EUR"));
euroAmounts.add(Money.of(10, "EUR"));
euroAmounts.add(Money.of(12, "EUR"));
Optional<MonetaryAmount> max = euroAmounts.stream().reduce(MonetaryFunctions.max());
Optional<MonetaryAmount> min = euroAmounts.stream().reduce(MonetaryFunctions.min());
Optional<MonetaryAmount> sum = euroAmounts.stream().reduce(MonetaryFunctions.sum());
System.out.println();
System.out.println("reduction");
System.out.printf("Máximo %s, mínimo %s, suma %s\n", max.get(), min.get(), sum.get());
// exchange rates
ExchangeRateProvider exchangeRateProviderECB =
MonetaryConversions.getExchangeRateProvider("ECB");
ExchangeRateProvider exchangeRateProviderOER =
MonetaryConversions.getExchangeRateProvider("OER");
ExchangeRate exchangeRateECB = exchangeRateProviderECB.getExchangeRate("USD", "EUR");
ExchangeRate exchangeRateOER = exchangeRateProviderOER.getExchangeRate("USD", "EUR");
System.out.println();
System.out.println("exchange rates");
System.out.printf(
"Ratio de conversión de USD a EUR (ECB, European Central Bank): %f\n",
exchangeRateECB.getFactor().doubleValue());
System.out.printf(
"Ratio de conversión de USD a EUR (OER, Open Exchange Rates): %f\n",
exchangeRateOER.getFactor().doubleValue());
// conversion
CurrencyConversion toEuroECB = MonetaryConversions.getConversion("EUR", "ECB");
CurrencyConversion toEuroOER = MonetaryConversions.getConversion("EUR", "OER");
MonetaryAmount tenDollarToEuroECB = tenDollar.with(toEuroECB);
MonetaryAmount tenDollarToEuroOER = tenDollar.with(toEuroOER);
System.out.println();
System.out.println("conversion");
System.out.printf("10 USD son %s EUR (ECB)\n", tenDollarToEuroECB);
System.out.printf("10 USD son %s EUR (OER)\n", tenDollarToEuroOER);
// formating
MonetaryAmountFormat spainFormat = MonetaryFormats.getAmountFormat(new Locale("es", "ES"));
MonetaryAmountFormat usFormat = MonetaryFormats.getAmountFormat(new Locale("en", "US"));
MonetaryAmount fiveThousandEuro = Money.of(5000, euro);
System.out.println();
System.out.println("formating");
System.out.printf(
"Formato de 5000 EUR localizado en España: %s\n", spainFormat.format(fiveThousandEuro));
System.out.printf(
"Formato de 5000 EUR localizado en Estados Unidos: %s\n",
usFormat.format(fiveThousandEuro));
// parsing
MonetaryAmount twelvePointFiveEuro = spainFormat.parse("12,50 EUR");
System.out.println();
System.out.println("parsing");
System.out.printf("Analizando «12,50 EUR» es %s\n", spainFormat.format(twelvePointFiveEuro));
// custom exchange rates provider
ExchangeRateProvider customExchangeRateProvider =
MonetaryConversions.getExchangeRateProvider("OER");
ExchangeRate customExchangeRate = customExchangeRateProvider.getExchangeRate("USD", "EUR");
System.out.println();
System.out.println("custom exchange rates");
System.out.printf(
"Ratio de conversión de USD a EUR: %f\n", customExchangeRate.getFactor().doubleValue());
}