java sorted map example

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HashBidiMap();bidi.put("SIX", "6");bidi.get("SIX"); // returns "6"bidi.getKey("6"); // returns "SIX"bidi.removeValue("6"); // removes the mappingBidiMap inverse = bidi.inverseBidiMap(); // returns a map with keys and values swapped Several examples can be found on Google: http://java.dzone.com/articles/guavas-bidirectional-maps, APIs in Apache commons collections do not support generic functions, but there is another option, guava-libraries, whi

Turn from: http://www.cnblogs.com/fczjuever/archive/2013/04/07/3005997.html 1. Elaborates In the Java map Traversal way, many articles are recommended to use EntrySet, think it is more efficient than keyset. The reason: The EntrySet method gets all the keys and value sets at a time, and keyset gets only a set of keys, which, for each key, goes to the map to find

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1. To elaborate In the Java map Traversal way, many articles are recommended to use EntrySet, think it is more efficient than keyset. The reason: The EntrySet method gets all the keys and value sets at a time, and keyset gets only a set of keys, which, for each key, goes to the map to find an extra value, which reduces overall efficiency. What about the actual s

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//add basic classes to a large collection -Czbkmap.put ("JY", jymap); the + //iterating through the collection ASetCzbkmap.keyset (); the for(String czbkmapkey:czbkmapset) { + System.out.println (czbkmapkey); -hashmapCzbkmap.get (czbkmapkey); $SetCzbkmapvalue.keyset (); $ for(String czbkmapvaluekey:czbkmapvalueset) { -Integer Czbkmapvaluevalue =Czbkmapvalue.get (czbkmapvaluekey); -System.out.println ("\ T" +czbkmapvaluekey+ "---" +czbkmapvaluevalue

is being used, Another thread changed the state of the vector (for example, adding or removing some elements), and when the method called iterator would throw concurrentmodificationexception, the exception must be caught.Synchronizedlist and Vector differencesby Collections.synchronizedlist (...) Provides a mechanism for linkedlist/arraylist thread safety, similar to vectors, so that the difference between synchronizedlist and vectors is that the Arr

() method in JS to parse the JSON string into a JSON object and then traverse it for front-end use. Let's get to the bottom of the list of the interactions between JSON and Java objects in Java. To achieve the mutual transfer between JSON and Java objects, you need a third-party jar pack, which uses the Json-lib jar package, which is downloaded with the addres

performance of Java applications. In my experience, the file change notifier in Nio.2 is one of the most interesting (underrated) features of the new input/output API. Many enterprise applications need to do some special processing in the following situations: When a file is uploaded to an FTP folderWhen the definition in a configuration is modifiedWhen a draft document is uploadedWhen other file system events occurThese are examples of change noti

Struts 2 The default expression language is OGNL, because it has the following advantages over other expression languages:1. Support Object method invocation, such as xxx.dosomespecial ();2. Support class static method invocation and value access, expression format is @[class full name (including package path)]@[Method name | Value name], for example: @java. Lang.string@format (' foo%s ', ' Bar ') or @tutor

permissions (these constructors are used for tuning). */Package Org.rui.pattern2;import Java.util.*;import junit.framework.*;/** * In the above example, the static factory () method causes all operations that create objects to be concentrated in one place , which is the only place where you need to change the code. This is certainly a good solution, which encapsulates the process of creating objects. However, the design pattern emphasizes the use of

Java programming those things 47-array use example 3 Zhengzhou game college Chen yuefeng from: http://blog.csdn.net/mailbomb 6.3.7 digital statisticsRequirement: count the number that appears the most in an integer. If the number of numbers is the same, the maximum number is used. For example, 1 outputs 1,121 output, 1 outputs output, and 3 Outputs output. This i

I. instance description This example uses Java to implement a very simple Sorting Algorithm ------ bubble algorithm. Sorting algorithms are often used in software programming of any scale. For example, in desktop tools and management information systems, in addition, sorting algorithms are widely used in industrial statistics and scientific computing. Through the

In this example, FileChannel and BufferedInputStream are used for test and comparison. TestHandler. java is used to implement dynamic proxy and test the running efficiency. Package com. test; import java. lang. reflect. invocationHandler; import java. lang. reflect. method; import

This article will discuss about Thread pool with fixed number of thread. From Java 5.0 + one can get such pool from Executors using following method-Public static ExecutorServiceNewFixedThreadPool (int nThreads)Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue. at any point, at most nThreads threads will be active processing tasks. if additional tasks are submitted when all threads are active, they will

This article will discuss about Thread pool that uses single thread to execute tasks. From Java 5.0 + one can get such pool from Executors using following method-Public static ExecutorService newSingleThreadExecutor ()Creates an Executor that uses a single worker thread operating off an unbounded queue. (Note however that if this single thread terminates due to a failure during execution prior to shutdown, a new one will take its place if needed to ex