This document discusses Java 9 features and improvements including modularization (Jigsaw), more efficient garbage collection, and new APIs for handling money, measurements, and other types. It provides code examples for using new Java 9 features like working with currencies and quantities, filtering and sorting streams, and summarizing data. Future Java releases may include additional performance enhancements and new APIs.

1. Java SE next
Otávio Santana
@otaviojava

2. OpenJDK
• Java 7
• Java 8
• Java 9

3. OpenJDK
hg clone http://hg.openjdk.java.net/jdk9/jdk9 jdk_1_9
sh ./get_source.sh
./configure
make install

4. OpenJDK
Java 8
Java 9
Compiler
GC
Corelibs
Sumatra
JavaFX

6. Companies
AMD
Apple
Azul Systems, Inc.
Canonical
Google
IBM
Intel
Oracle
RedHat
SAP Software Company
Stratus
Twitter

7. Launched the Java 8
● Lambda
● Metaspace
● Stream

8. Java 9
● Build: 31
● https://jdk9.java.net/download/
● Java 8 faster

9. Java 9
Reflections wrappers Regex Security Core
250
200
150
100
50
0
Java 8 - Process
Java 9 -Process
Java 8 - Memory
Java 9 -Memory

10. Improvements in GC
● Remove GC combinations deprecated
● Strings Deduplication
● Segmented Code Cache
● Shenandoah

11. Strings duplication
75
25
Heap
Another objects String
● 25% of Heap are Strings
● 13.5% String duplicates
String inside Heap
85
15
String Strings duplicates

12. Segmented
Code Cache
● JVM internal (non-method) code
● Profiled-code
● Non-profiled code

13. Sumatra and OpenJFX
● Use of GPU
● JavaFX inside OpenJDK

14. Jigsaw
● Updated at: 18/08/2014
● The source, JDK modularized

15. News to coders
● Light Write and read to JSON
● Generics to primitives
● builders to Collections
● Literal to Collections
● Process API Updates
● Smart Java Compilation
● http 2.0 client

16. News
● List<String> list = List.of(a, b, c);
● Set<String> set = Set.of(d, e, f, g);
● Map<String,String> map =
Map.of(k1, V1);//not collection
● List<Integer> list = #[ 1, 2, 3 ];

17. Money Api
● Take care of money to you :)
● Formating
● Rounding
● Exchange Rate

18. Money Api
CurrencyUnit euro = MonetaryCurrencies.getCurrency("EUR");
MonetaryAmount money = Money.of(120, euro);
NumberValue number = money.getNumber();
BigDecimal value = number.numberValue(BigDecimal.class);

19. Money Api
CurrencyUnit dollar =
MonetaryCurrencies.getCurrency(Locale.US);
MonetaryAmount m = Money.of(120, dollar);
NumberValue number = m.getNumber();
BigDecimal value = number.numberValue(BigDecimal.class);

20. Money Api
MonetaryAmountFormat format =
MonetaryFormats.getAmountFormat(Locale.US);
String text = format.format(m);//12,50 USD
format =
MonetaryFormats.getAmountFormat(AmountFormatQueryBuild
er.create(Locale.US).set(CurrencyStyle.SYMBOL).build());
String text = format.format(m);//$123,456.56

21. Money Api
MonetaryAmount noMoney = Money.of(0, euro);
MonetaryAmount m1 = Money.of(10, euro);
MonetaryAmount m2 = Money.of(30, euro);
MonetaryAmount m3 = Money.of(40, euro);
List<MonetaryAmount> moneys = Arrays.asList(m1, m2, m3);
MonetaryAmount sum =
moneys.stream().reduce(MonetaryFunctions.sum()).orElse(noM
oney);

22. Welcome Lambda
List<MonetaryAmount> justDollar = moneys.stream()
.filter((MonetaryFunctions.isCurrency(DOLLAR)))
.collect(Collectors.toList());
List<MonetaryAmount> notEuro =
moneys.stream().filter((MonetaryFunctions.isNotCurrenc
y(EURO))).collect(Collectors.toList());

23. Welcome Lambda
MonetaryFunctions.isCurrency(DOLLAR).and(Monetary
Functions.isBetween(min, max)));
MonetaryFunctions.containsCurrencies(EURO,
DOLLAR)).or(MonetaryFunctions.isGreaterThan(money
)));

24. Welcome Lambda
List<MonetaryAmount> orderCurrencyValue =
moneys.stream().sorted(MonetaryFunctions.sortCurrenc
yUnit().thenComparing(MonetaryFunctions.sortNumber
())).collect(Collectors.toList());
List<MonetaryAmount> orderHighValue =
moneys.stream().sorted(MonetaryFunctions.sortCurrenc
yUnit().thenComparing(
MonetaryFunctions.sortCurrencyUnitDesc()))
.collect(Collectors.toList());

25. Welcome Lambda
Map<CurrencyUnit, List<MonetaryAmount>> groupBy =
moneys.stream().collect(MonetaryFunctions.groupByCu
rrencyUnit());

26. Welcome Lambda
MonetarySummaryStatistics summary =
getCurrencies().stream().collect(MonetaryFunctions.sum
marizingMonetary(DOLLAR));
GroupMonetarySummaryStatistics groupSummary =
getCurrencies().stream().collect(MonetaryFunctions.gro
upBySummarizingMonetary());

27. Welcome Lambda
MonetarySummaryStatistics summary = ...
MonetaryAmount min = summary.getMin();
MonetaryAmount max = summary.getMax();
MonetaryAmount sum = summary.getSum();
MonetaryAmount avarage = summary.getAverage();
Long count = summary.getCount();

28. Welcome Lambda
GroupMonetarySummaryStatistics groupSummary =...
Map<CurrencyUnit, MonetarySummaryStatistics> map =
groupSummary.get();
MonetarySummaryStatistics summaryDollar =
map.get(DOLLAR);

29. Exchange Rate
MonetaryAmount m1 = Money.of(10, euro);
MonetaryAmount m2 = Money.of(30, dollar);
m1.add(m2); throw MonetaryException (“Currency mismatch...

30. Exchange Rate
ExchangeRateProvider provider =
MonetaryConversions.getExchangeRateProvider("ECB");
MonetaryAmount d2e =
provider.getCurrencyConversion(euro).apply(mDollar);

31. Exchange Rate
ExchangeRateProvider provider =
MonetaryConversions.getExchangeRateProvider("IMF");
MonetaryAmount d2e =
provider.getCurrencyConversion(euro).apply(mDollar);

32. Exchange Rate
List<MonetaryAmount> orderCurrencyValue =
moneys.stream().sorted(MonetaryFunctions.sortExcha
nge(provider).collect(Collectors.toList());
● 9 BRL
● 8 USD
● 7 EUR
● Because:
● 1 USD = 2.4203 BRL
● 1 USD = 2.4203 BRL
● 1 USD = 0.79 EUR
● 7 EUR
● 9 BRL
● 8 USD

33. Exchange Rate
MonetaryAmount sum =
moneys.stream().reduce(MonetafyFunctions.sum(provider
, DOLLAR)).orElse(noMoney);
MonetaryAmount min =
moneys.stream().reduce(MonetafyFunctions.min(provider
)).orElse(noMoney);
MonetaryAmount max =
moneys.stream().reduce(MonetafyFunctions.max(provide
r)).orElse(noMoney);

34. Exchange Rate
MonetarySummaryStatistics summary =
getCurrencies().stream().collect(MonetaryFunctions.sum
marizingMonetary(DOLLAR, provider));

35. Measurement API
● Work with Measure
● Standardize measure unit
● Format
● Operations (convert, add, subtract)

36. Measurement API
QuantityFactory<Mass> massFactory =
QuantityFactoryProvider.getQuantityFactory(Mass.class);
Quantity<Mass> tenKilogram = massFactory.create(10,
SI.KILOGRAM);

37. Measurement API
QuantityFactory<Time> timeFactory =
QuantityFactory.getInstance(Time.class);
Quantity<Time> m1 = timeFactory.create(40, MINUTE);
Quantity<Time> m2 = timeFactory.create(20, MINUTE);
Quantity<Time> h1 = m1.add(m2).to(HOUR); //1 hour

38. Measurement API
QuantityFactory<Time> timeFactory =
QuantityFactory.getInstance(Time.class);
Quantity<Time> m1 = timeFactory.create(1, DAY);
Quantity<Time> m2 = timeFactory.create(12, HOUR);
Quantity<Time> result = m1.add(m2); //1.5 day

39. Measurement API
Quantity<Time> minutes = Quantities.getQuantity(15,
SI.MINUTE);
Quantity<Time> hours = Quantities.getQuantity(18, SI.HOUR);
Quantity<Time> day = Quantities.getQuantity(1, SI.DAY);
Quantity<Time> seconds = Quantities.getQuantity(100,
SI.SECOND);
List<Quantity<Time>> times = new ArrayList<>();
times.addAll(Arrays.asList(minutes, hours, day, seconds));

40. Measurement API
List<Quantity<Time>> sortNaturalList = times.stream()
.sorted(QuantityFunctions.sortNatural())
.collect(Collectors.toList());
● seconds - 100 seconds
● minutes - 15 minutes
● hours - 18 hours
● day - 1 day

41. Measurement API
List<Quantity<Time>> sortNaturalList = times.stream()
.sorted(QuantityFunctions.sortNaturalDesc())
.collect(Collectors.toList());
● day - 1 day
● hours - 18 hours
● minutes - 15 minutes
● seconds - 100 seconds

42. Measurement API
times.add(Quantities.getQuantity(24, SI.HOUR));
Comparator<Quantity<Time>> sortNatural = QuantityFunctions.sortNatural();
Comparator<Quantity<Time>> sortSymbol = QuantityFunctions.sortSymbol();
List<Quantity<Time>> sortNaturaAndSymbolList = times.stream()
.sorted(sortNatural.thenComparing(sortSymbol)) .collect(Collectors.toList());
● seconds - 100 seconds
● minutes - 15 minutes
● hours - 18 hours
● day - 1 day
● dayInHour – 24 hours

43. Measurement API
List<Quantity<Time>> greaterThanOneDay = times
.stream()
.filter(QuantityFunctions.isGreaterThan(oneDay)).collect(Collect
ors.toList());
List<Quantity<Time>> greaterThanOneDay = times
.stream().filter(QuantityFunctions.isBetween(oneHour,
oneDay)).collect(Collectors.toList());

44. Measurement API
Mixing Filters
QuantityFunctions.isGreaterThan(oneDay).and(QuantityFunctio
ns.fiterByUnit(SI.HOUR)));
QuantityFunctions.isGreaterThan(oneDay).or(QuantityFunction
s.fiterByExcludingUnit(SI.DAY)));

45. Measurement API
QuantitySummaryStatistics<Time> summary =
times.stream().collect(QuantityFunctions.summarizingMeasure(
SI.HOUR)); //result in hours
summary.getCount();
summary.getAverage();
summary.getMax();
summary.getMin();
summary.getSum();

46. Measurement API
QuantitySummaryStatistics<Time> summaryDay =
summary.to(SI.DAY);
summary.getMin(SI.MINUTE);
summary.getMax(SI.MINUTE);
summary.getSum(SI.MINUTE);
summary.getAverage(SI.MINUTE);

47. Measurement API
Quantity<Time> t1 = timeFactory.create(1, DAY);
Quantity<Mass> m1 = timeFactory.create(12, KILOGRAM);
Quantity<Length> l1 = timeFactory.create(12, KILOGRAM);
t1.add(m1); //error
Quantity<Speed> s1 = l1.divide(t1).asType(Speed.class);

48. Measurement API
● Acceleration
● Length
● Angle
● Area
● Mass
● Power
● Energy
● Speed
● Force
● Temperature
● Time
● Information
● Volume
And more! 52 quantities

49. It isn't a Spoiler
Sunday, September 28
12:30 p.m.–3:00 p.m.
Moscone North, Hall D
Thursday, October 2
9:00 a.m.–10:45 a.m.
Marriott Marquis, Salon 7/8/9

50. Thank you
Otávio Santana
@otaviojava