JDK8至JDK 11 常用API更新

1. Optional
   新增:

stream()

ifPresentOrElse(Consumer<? super T> action, Runnable emptyAction)

or(Supplier<? extends Optional<? extends T>> supplier)

版本: 9

orElseThrow()

版本: 10

isEmpty()

版本: 11

2. CompletableFuture
   新增:

completeOnTimeout(T value, long timeout, TimeUnit unit)

newIncompleteFuture()

defaultExecutor()

copy()

minimalCompletionStage()

completeAsync(Supplier<? extends T> supplier, Executor executor)

orTimeout(long timeout, TimeUnit unit)

delayedExecutor(long delay, TimeUnit unit, Executor executor)

delayedExecutor(long delay, TimeUnit unit)

completedStage(U value)

failedFuture(Throwable ex)

failedStage(Throwable ex)

版本: 9

3. Stream
   新增:

takeWhile(Predicate<? super T> predicate)

dropWhile(Predicate<? super T> predicate)

ofNullable(T t)

iterate(T seed, Predicate<? super T> hasNext, UnaryOperator<T> next)

版本: 9

4. Map
   新增:

of() 系列方法

entry(K k, V v)

版本: 9

copyOf(Map<? extends K,? extends V> map)

版本: 10

5. List
   新增:

of() 系列方法

版本: 9

copyOf(Collection<? extends E> coll)

版本: 10

6. Set
   新增:

of() 系列方法

版本: 9

copyOf(Collection<? extends E> coll)

版本: 10

7. LocalDate
   新增:

datesUntil(LocalDate endExclusive)

datesUntil(LocalDate endExclusive, Period step)

toEpochSecond(LocalTime time, ZoneOffset offset)

版本: 9

8. Locale
   新增:

getISOCountries(Locale.IsoCountryCode type)

版本: 9

9. String
   新增:

strip()

stripLeading()

stripTrailing()

isBlank()

lines()

repeat(int count)

版本: 11

chars()

codePoints()

版本: 9

10. HttpClient
    新增类
    版本: 11

11. InputStream
    新增:

nullInputStream()

readNBytes(int len) throws IOException

版本: 11

readAllBytes() throws IOException

readNBytes(byte[] b, int off, int len) throws IOException

transferTo(OutputStream out) throws IOException

版本: 9

12. OutputStream
    新增:

nullOutputStream()

版本: 11

13. ByteArrayOutputStream
    新增:

writeBytes(byte[] b)

版本: 11

toString(Charset charset)

版本: 10

14. Selector
    新增:

select(Consumer<SelectionKey> action, long timeout) throws IOException

select(Consumer<SelectionKey> action) throws IOException

selectNow(Consumer<SelectionKey> action) throws IOException

版本: 11

15. Objects
    新增:

requireNonNullElse(T obj, T defaultObj)

requireNonNullElseGet(T obj, Supplier<? extends T> supplier)

checkIndex(int index, int length)

checkFromToIndex(int fromIndex, int toIndex, int length)

checkFromIndexSize(int fromIndex, int size, int length)

版本: 9

16. Path
    新增:

of(String first, String... more)

of(URI uri)

版本: 11

17. Files
    新增:

readString(Path path) throws IOException

readString(Path path, Charset cs) throws IOException

writeString(Path path, CharSequence csq, OpenOption... options) throws IOException

writeString(Path path, CharSequence csq, Charset cs, OpenOption... options) throws IOException

版本: 11

18. Socket
    新增:

setOption(SocketOption<T> name, T value) throws IOException

getOption(SocketOption<T> name) throws IOException

supportedOptions()

版本: 9

19. HttpURLConnection
    新增:

setAuthenticator(Authenticator auth)

版本: 9

20. URLClassLoader
    新增:

URLClassLoader(String name, URL[] urls, ClassLoader parent)

URLClassLoader(String name, URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory)

版本: 9