Guava 19.0 RC1发布，Google的Java常用类库

Guava 19.0 RC1 发布，主要改进：

common.base

• Added CharMatcher static factory methods equivalent to the CharMatcher constants. For example, added CharMatcher.whitespace() which is equivalent to CharMatcher.WHITESPACE. Eventually, the constants will be deprecated and removed.

• This is being done because using constants requires a large number of classes to be initialized when anything from CharMatcher is used; switching to static factory methods allows classes to be initialized only as needed for the type of CharMatcher actually being used.

• Added Throwables.lazyStackTrace(Throwable) - Returns a List<StackTraceElement> that may load the stack trace elements lazily. Useful if you want to get only the first N elements of the stack trace efficiently.

• Added lazyStackTraceIsLazy()- Returns whether or not the above method is able to use the special implementation that makes it lazy on the current platform.

• Added VerifyException constructor overloads taking a Throwable cause.

common.cache

This package has graduated from @Beta, making it safe to use in library code.

• Added visibility of CacheLoader.UnsupportedLoadingOperationException

• Added RemovalNotification.create

• These should only be needed if creating a custom cache implementation

common.collect

Added factory and builder methods for various ImmutableMaps and ImmutableMultimaps that take Iterable<Map.Entry>.

• Added FluentIterable.toMultiset()

• Added RangeSet.asDescendingSetOfRanges() and RangeMap.asDescendingMapOfRanges()

• Added Lists.cartesianProduct(List...) and Lists.cartesianProduct(List<List>>)

• Added Maps.newLinkedHashMapWithExpectedSize(int)

• Re-added Multisets.removeOccurrences(Multiset, Multiset) which was (binary incompatibly) missing in 18.0 because it was replaced withMultisets.removeOccurences(Multiset, Iterable)

• Deprecated MapConstraint and MapConstraints

• Deprecated Sets.newSetFromMap(Map) - Java 6 provides Collections.newSetFromMap(Map)

• Removed MapMaker.softValues()

common.eventbus

• Added EventBus.identifier()

• Removed protected method AsyncEventBus.dispatchQueuedEvents() (made package-private)

common.hash

• Added BloomFilter.create overloads taking a long for the expectedInsertions

• Added Hashing.sha384()

• Added Hashing.concatenating(HashFunction, HashFunction, HashFunction...) andHashing.concatenating(Iterable<HashFunction>)

common.io

• Added ByteSource.sizeIfKnown()

• Added CharSource.length()

• Added CharSource.lengthIfKnown()

common.net

• Added a couple new constants to HttpHeaders and MediaType

• Updated public suffix list for InternetDomainName

common.reflect

• Added TypeToken.isSubtypeOf(TypeToken), TypeToken.isSupertypeOf(TypeToken) and overloads of both that take a Type

• Deprecated TypeToken.isAssignableFrom(TypeToken) andTypeToken.isAssignableFrom(Type) - isSupertypeOf provides equivalent behavior with a less confusing name

common.util.concurrent

• Added AbstractFuture.newCancellationCause()

• Added AbstractFuture.setFuture(ListenableFuture)

• Added Futures.getChecked

• Added Futures.catching and Futures.catchingAsync

• Added Futures.transformAsync

• Added Futures.withTimeout

• Deprecated FutureFallback and Futures.withFallback methods - these are replaced withFutures.catching

• Deprecated Futures.get methods taking a Class<X extends Exception> - these are replaced with Futures.getChecked

• Deprecated Futures.transform methods taking an AsyncFunction - these are replaced with Futures.transformAsync

详细改进请看发行说明。

下载：https://github.com/google/guava/archive/v19.0-rc1.zip。

Guava 中文是石榴的意思，该项目是 Google 的一个开源项目，包含许多 Google 核心的 Java 常用库。

目前主要包含：

•  com.google.common.annotations

•  com.google.common.base

•  com.google.common.collect

•  com.google.common.io

•  com.google.common.net

•  com.google.common.primitives

•  com.google.common.util.concurrent

在线API doc：http://tool.oschina.net/apidocs/apidoc?api=guava