guava jar

guava-19.0 google-collections-1.0 have Immutableset class, package path is also consistent, the former has copyOf (Collection)?First, the application error:Ii. SolutionsConfigurations.all {Exclude module: ' Logback-core 'Exclude module: ' Logback-classic 'Exclude module: ' Google-collections '}Third, restart the applicationComparing pre-and post-generated dependenciesGradlew Dependencies > Dependsx.txtNo Google-collections-1.0.jar.Problem Solving!Api-

Guava is the ice cream (essence) on the Java API cake.a simple description of the source package:Com.google.common.annotations: Common annotation type.Com.google.common.base: Basic tool class libraries and interfaces.Com.google.common.cache: Caching toolkit, a very easy-to-use and powerful in-JVM cache.Com.google.common.collect: A collection interface with generics extension and implementation, as well as tool classes, where you'll find lots of fun co

Guava Study notes: multimapsSometimes we need this data type MapThe realization of MultimapMultimap provides a rich implementation, so you can use it to replace the map Realize Key implementation Value implementation Arraylistmultimap HashMap ArrayList Hashmultimap HashMap HashSet Linkedlistmultimap Linkedhashmap LinkedList Linkedhashmul

entries, separating key and value, respectively, to form the respective listImmutablelist.builderImmutablelist.builder (); Immutablelist.builderImmutablelist.builder (); for(inti = 0; i ) {EntryEntries[i]; Keybuilder.add (Entry.getkey ()); Valuebuilder.add (Entry.getvalue ()); } return NewRegularimmutablesortedmap( NewRegularimmutablesortedset(Keybuilder.build (), comparator), Valuebuilder.build ());}The entry in Immutablemap is also being re-implemented

Bimap is also the new collection class provided in guava, the alias is called Two-way map, is key-"value,value-" key, that is, you can locate the value by key, you can also use value to locate key.This scenario is often encountered in everyday development.In fact, Bimap is relatively simple, it is an interface, extension of the map interface, which is also the it is not allowed to have a duplicate V, This is important, when you try to put a duplicate

first, Directory1. read-only Settings2. Functional Programming + Modular programming3. Constraint conditions4. Set Operation (combination, difference set, Intersection)second, The code implementation1. read-only Settings public Static voidmain (String [] Args) {//read-only SettingsList ls=NewArrayList (); Ls.add (A); Ls.add ("b"); Ls.add (C); //class libraries that do not use guavaList collections.unmodifiablelist (ls); //Readlist.add ("d"); Error//using the

Guava on the basis of JDK1.5, the extension of the contract, there are some ease of use extension (such as monitor), some are functional perfect (such as listenablefuture), coupled with a number of functional programming features, so that the flexibility of the contract is greatly improved ... Use of Monitor: Import Com.google.common.util.concurrent.Monitor; Import java.util.ArrayList; Import Java.util.Iterator; Import java.util.List; Import Java.u

Immutable objects has many advantages, including: Safe for use by untrusted libraries. Thread-safe:can is used by many threads with no risk of race conditions. doesn ' t need to support mutation, and can make time and space savings with that assumption. All immutable collection implementations is more memory-efficient than their mutable siblings (analysis) Can is used as a constant, with the expectation that it'll remain fixed Example public static final immutableset

negative or 0 Tostring Public String toString ()The following description is replicated in the Java.lang.Object class.Returns the character representation of an object. In general, the ToString method returns a string that is a "textual rendering" object.The result should be a concise but easy-to-read information expression. It is recommended that all subclasses override this method.The ToString method returns a string consisting of the instance's cla

Get Ids from List public static list List to Map: public static Map List to Multimap: public static Multimap Guava-list to Map and Multimap

: result1) { System. Out.println ("1:" + ss); }liststrlist = Lists.transform (List, F1); For (String SS: strlist) { System. Out.println ("2:" + ss); }iteratorit = iterators.transform (list.iterator (), F1); While (it.hasnext ()) { System. Out.println ("3:" + It.next ()); }functionf2 = new function @Override Public string Apply (string input) { if (objects.equal (input, "Malone")) { return "Malone s function"; } else { return "Lanlan s fu

Com.google.common.util.concurrent.ListeningExecutorService;Import com.google.common.util.concurrent.MoreExecutors;Import Com.google.common.util.concurrent.SettableFuture;Public class Asyncfunctionsample implements Asyncfunction private Concurrentmapmap = Maps.newconcurrentmap (); private Listeningexecutorservice listeningexecutorservice = Moreexecutors.listeningdecorator (Executors.newfixedthreadpool (2)); Here is a simple simulation of a serviceprivate Mapservice = new Hashmap { put (1L, "

()!=true) { System.out.println ("A person Age:" +age+ ", Neme:" +neme); } else{ System.out.println ("parameter input wrong! "); } }}Description: Parameter validation, we have to add an if statement every time to make judgments, repeated work will be done several times. The Getperson method has only 2 parameters, the validation rules are not very complicated, if the parameters are too much, the validation rules are complicated, the readability of the above

value is overwritten. String valuename= Bimap.get (4); System.out.println ("Value with ID 4--" +valuename); }}/*Run Result: *id value of 1--Zhang San * Zhang San key value--1 *id to 4 value--Small*/If the value is duplicated, the direct error to run is as follows: Bimap.put (6, "small"); /** Background Direct Error * Exception in thread "main" Java.lang.IllegalArgumentException:value already present: small * At Com.google.common.collect.HashBiMap.put (ha

In the previous Scala parameter check and assertion: Require, assert, assume, and ensuring, the Fathom Scala assertion refers to the JDK's built-in rough support for assertions, which isassertstatement, and by default the feature is turned off, which requires-eaOpen. Assert Object! = NULL;Assert Object! = null: "Object can ' t be null"; has also been further exposed to Scala'sPredefMethodrequire,assert,assumeAndensuringHow to test the results of parameters and assertion operations,

First, the connector "Joiner"Second, the splitter "Splitter"Three, character match "Charmatcher"　　Iv. Character Set "Charsets"　　charsets: The six character sets that are guaranteed to support all Java platforms provide a constant reference. Try to use these constants instead of getting character set instances by name. Try { byte[] bytes = Test.getbytes ("UTf-8"); Catch (unsupportedencodingexception e) { e.printstacktrace (); }Change to the following expres

, equivalence.equals ()); }Set and other content to map, this method in obtaining some object to map operation is more useful. Public Static Super K, v> function){ifinstanceof SortedSet) { return asmap ( Sortedset) set, function); Else { returnnew asmapview(set, function); } }Some objects go immutable map, as above, you just declare a guava function to overwrite the following its methods and then pass in: Public static tomap (

) Checks that index is a valid element index to a list, string, or array with the specified size. An element index could range from 0 inclusive to size exclusive. You don ' t pass the list, string, or array directly; You just pass its size.Returns index. Indexoutofboundsexception Checkpositionindex (int index, int size) Checks that index is a valid position index to a list, string, or array with the specified size. A position index may range from 0 inclusive to size

premise of inclusion, there are two kinds of situations. If R contains Rangetoremove highs, then r needs to be truncated by rangetoremove from the middle waist. If R does not contain rangetoremove highs, then R is just the part of the lower and the Rangetoremove overlap, and this section needs to be truncated. The source code for the truncated low-point section is as follows: Entry Mapentrybelowtotruncate = This. Entriesbylowerbound. Lowerentry(Rangetoremove. Lowerbo

*********************************************** Declaration *********************** *******************************Original works, from the "Xiaofeng Moon XJ" blog, Welcome to reprint, please be sure to indicate the source (HTTP://BLOG.CSDN.NET/XIAOFENGCANYUEXJ).Due to various reasons, there may be many shortcomings, welcome treatise!*********************************************************************************************************RangeMap is a collection type that maps disjoint, non-empty