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