The JSR 166 framework is a very important part of the Java class library.This framework provides a set of tools and classes for concurrent programming, so that developers can easily handle multi -threaded and concurrent problems.However, although the framework is very powerful and practical, there may be some problems in certain circumstances. To solve these problems, the JSR 166 framework introduced the concept of retrospective version.The so -called retrospective version means that when an operation fails, it can roll back to the previous state, so that the application can return to a consistent state.This retrospective mechanism allows the program to maintain consistency in the concurrent environment and avoid inconsistent data caused by multi -threaded competition. The following is an example code that uses the retrospective version to illustrate its usage and role: ```java import java.util.concurrent.atomic.AtomicInteger; public class BackoffExample { private AtomicInteger counter = new AtomicInteger(0); public void increment() { int backoffCount = 0; while (true) { int currentValue = counter.get(); int newValue = currentValue + 1; if (counter.compareAndSet(currentValue, newValue)) { System.out.println("Successfully incremented value to: " + newValue); break; } else { backoffCount++; // Use the retrospective version for retreat operation Backoff.backoff(backoffCount); } } } public static void main(String[] args) { BackoffExample example = new BackoffExample(); for (int i = 0; i < 10; i++) { new Thread(() -> example.increment()).start(); } } } class Backoff { private static final int MIN_DELAY = 100; private static final int MAX_DELAY = 1000; public static void backoff(int backoffCount) { int delay = Math.min((1 << backoffCount) * MIN_DELAY, MAX_DELAY); try { Thread.sleep(delay); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } ``` In the above example, the `Backoffexample` class implements a self -increase method using a retrospective version,` Increment`.In this method, the `AtomicInteger` class is used to ensure atomic operations and retreat when the operation fails.The retreat operation is implemented by the `Backoff` class. Calculate the waiting time of waiting based on the number of retreats, and use the` Thread.sleep` method to suspend the current thread. By using the retrospective version, we can ensure that the operation of shared resources in the concurrent environment is safe and consistent.When each thread is operated, if it fails, it will go back and try to re -operate until it succeeds. In summary, the retrospective version is a mechanism to solve the problem of concurrent problems in the JSR 166 framework.It provides a way to ensure the consistency of shared resource, which can effectively handle the problem of inconsistent data caused by multi -threaded competition.In practical applications, we can flexibly use the retrospective version to improve the concurrent performance and stability according to specific needs and scenes.

Android supports the installation and configuration method of the framework of the library document file Overview: Android support library (SUPPORT LIBRARIES) provides a series of powerful classes and tools for simplifying Android application development and providing the latest API features compatible with old versions.In order to be able to use the functions of these support libraries, developers need to correctly install and configure the corresponding support library framework in the project.This article will introduce the method of installing and configured Android support library file frameworks, and provide corresponding Java code examples. step: 1. Update Android Studio version: Make sure you are using the latest version of Android Studio to obtain the latest support library functions and updated API features. 2. Add dependencies to the Build.gradle file: In your project's BUILD.GRADLE file, find the DependenCies part, and add the following code: ```groovy dependencies { Implementation 'com.android.support:appcompat-v7: version number' // Add other support library dependencies that need to be used } ``` In this example, we added the dependency of the AppCompat-V7 support library.You can add the dependencies of other support libraries according to your needs, such as Design, RecyclerView, etc., using the same format. 3. Synchronous project: Once you add the dependence of the support library, you need to synchronize your project to obtain the required library documents.In Android Studio, click "File" in the menu bar, and then select "Sync Project with Gradle Files". 4. Configure MINSDKVERSION and Targetsdkversion: In your App Module's Build.gradle file, make sure you set up the right MINSDKVERSION and targetsdkversion.These values should match the support library you used to ensure compatibility. ```groovy android { defaultConfig { MINSDKVERSION version number Targetsdkversion version number // Other configuration items } // Other configuration items } ``` 5. Use the class and functions of the support library: Once you complete the above configuration steps, you can use the class and functions of the support library in your Java code.For example, if you want to use the ACTIONBAR in the AppCompat-V7 support library, you can call it in your activity in your activity: below: ```java import android.support.v7.app.ActionBar; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ActionBar actionBar = getSupportActionBar(); // Further operate ACTIONBAR ... } } ``` Summarize: Installation and configuration of Android support library file framework is an important step in developing Android applications.This article provides a series of steps, from updating Android Studio to adding dependencies correctly, and provides a Java code example using the AppCompat-V7 support library.By correcting the support library framework, developers can easily use the categories and functions of various support libraries to provide better user experience and equipment compatibility.

Use Android support library document file framework in the Java library The Android support library is designed to help developers provide better compatibility and functionality on different Android versions.The use of Android support library document file framework in the Java library can help developers better understand and use the class and methods provided in the support library. First, make sure that the Android support library has been introduced in the project.You can add the required support library to the project in the DEPENDENDECIES part in the project built.gradle file. ```java dependencies { // AndroidX Support Library implementation 'androidx.appcompat:appcompat:1.3.0' // Other support libraries implementation 'com.google.android.material:material:1.3.0' implementation 'androidx.constraintlayout:constraintlayout:2.1.0' // Other dependencies } ``` In the Java class library, you can use different Android support libraries as needed.Let's use the AppCompat Library as an example to illustrate how to use Android to support library file frameworks in the Java class library. 1. Import the required classes and methods: ```java import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import androidx.annotation.Nullable; ``` 2. Create a class that inherits the AppCompatActivity to build your activity: ```java public class MainActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Perform your other initialization and operation here } } ``` 3. Create a XML layout file (such as Activity_main.xml) corresponding to your activity layout in the Res/Layout directory, and define your interface. 4. Add any other required resource files, such as images or string. In this example, we show how to use the AppCompat library to create a basic activity.You can use other support libraries according to the special requirements of the project, such as the Material library to use more UI components and styles, or the ConstraintLayout library to use a more flexible layout. It should be noted that you must read and understand the corresponding documentation files in the process of using the support library.The documentation of Android support library provides a detailed description of various classes, methods and attributes, as well as example code and best practice suggestions.Careful reading the document can help developers better use and understand the Android support library. To sum up, you can use Android to support library document file frameworks in the Java library according to the following steps: 1. Introduce the required Android support library dependencies. 2. Import the class and methods of the support library. 3. Create a class that inherits from AppCompatActivity and builds your activities. 4. Create appropriate layout documents and resource files. 5. Read and understand the documents of the corresponding support library in order to better use the Android support library. I hope this article can help you understand how to use Android support library file frameworks in the Java class library.If you need to help further, please check the official Android document or other related resources.

How to use Android to support library document file framework to improve application performance Abstract: The Android support library is an indispensable part of Android development. It provides developers with rich tools and components to build high -performance Android applications.This article will focus on the Android support library document file framework and how to use this framework to improve application performance.We will explain related concepts and skills through the actual Java code example. 1 Introduction In Android development, the Android support library is a set of library files for the old version of Android devices and API.These library files are included in Android SDK and can be imported into the project via Gradle or manually. 2. Use Support Annotation Support Annotion is a popular support library tool that provides a set of annotations for static analysis and compilation.These annotations can help developers find potential problems during the encoding process and provide some tips and suggestions. Below is an example of using SUPPORT Annotion: ```java @NonNull public String convertToString(@Nullable Object obj) { if (obj == null) { return ""; } return obj.toString(); } ``` In the above examples, we use the possibility of ``@nonnull` and@nullable `to mark the parameters and return values, which helps detect potential empty pointer abnormalities. 3. Use Support Library Utility Classes The Android support library provides many practical tool classes to handle common development tasks.These tools can help developers write more efficient and simpler code to improve their application performance. For example, you can use the `Textutils` class to check whether the string is empty: ```java if (TextUtils.isEmpty(str)) { // Execute the corresponding operation } ``` By using these practical tool classes, you can reduce duplicate code and take some optimization measures to improve the performance of the application. 4. Use RecyclerView RecyclerView is a powerful layout control, which provides customized lists and grid views.Compared with the traditional ListView, it can display a lot of data more efficiently and support complex layout and interaction. The following is an example of using RecyclerView: ```java RecyclerView recyclerView = findViewById(R.id.recycler_view); recyclerView.setLayoutManager(new LinearLayoutManager(this)); MyAdapter adapter = new MyAdapter(dataList); recyclerView.setAdapter(adapter); ``` By using RecyclerView, you can implement a highly customized list and grid layout to improve the user experience and performance of the application. in conclusion: Android supports library document file framework is an important part of Android development. It provides rich tools and components to help developers build high -performance Android applications.By using the tools and skills in the framework of the library document files reasonably, and through actual coding practice, developers can improve the performance of the application and provide a better user experience. Reference link: -Android support library official document: https://developer.android.com/topic/libraries/support-library/index.html -Support annotation document: https: //developer.android.com/studio/write/annotations.html -RcyclerView document: https://developer.android.com/guide/topics/ui/Layout/recyclerview.html

The advantage of the retrospective version of the JSR 166 framework in the Java library On the Java platform, the JSR 166 framework is an important tool for concurrent programming.This framework provides a rich set of libraries to deal with the problems of multi -threaded and concurrent programming.One of the key features is that it provides a function called backport, allowing the use of a new version of the concurrent library on the old version of the Java platform. The retrospective version refers to the ability of the latest version and the ability to improve the software or platform that is applied to earlier versions.In the Java class library, the advantage of the retrospective version is that it allows developers to enjoy the benefits of the updated version of the concurrent library in the environment that supports the old version of Java.This is very valuable for those projects or applications that cannot be upgraded to the latest version of Java. One of the main advantages of the retrospective version is that it provides a more stable and reliable concurrent programming environment.By using the retrospective version, developers can use the concurrent problems and performance improvements that have been solved in the latest version, while avoiding the defects and problems known in the old version.This can significantly improve the robustness and reliability of applications. In addition, the retrospective version also provides higher levels of abstraction and simpler programming interface.These improvements make it easier for developers to write and send code and reduce the possibility of incorrect errors.Compared with the manual thread synchronization and blocking operation in the older version, the advanced concurrent library provided by the retrospective version can greatly simplify the development process. The following is a simple Java code example, which shows how to use the JSR 166 framework with the retrospective version to achieve concurrent processing.Suppose we have a counter to be shared between multiple threads: ```java import edu.umd.cs.jsr166e.*; public class CounterExample { private static final int THREAD_COUNT = 10; private static final int INCREMENT_COUNT = 100000; public static void main(String[] args) { AtomicInteger counter = new AtomicInteger(0); Thread[] threads = new Thread[THREAD_COUNT]; for (int i = 0; i < THREAD_COUNT; i++) { threads[i] = new Thread(() -> { for (int j = 0; j < INCREMENT_COUNT; j++) { counter.incrementAndGet(); } }); threads[i].start(); } // Waiting for all threads to complete for (Thread thread : threads) { try { thread.join(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("Final counter value: " + counter.get()); } } ``` In the above example, we use the retrospective version of the `Atomicinteger` class to achieve a thread -to -safety counter.We have created multiple threads and the value of the counter in each thread.By using the retrospective `AtomicInteger` class, we can ensure that the counter is correctly operated in the concurrent environment without the need to synchronize manually. All in all, the retrospective version in the JSR 166 framework provides a method of using the latest concurrent library on the old version of Java, which brings the advantages of reliability, performance and programming convenience.Developers can use the characteristics of retrospective formats to apply better concurrency programming capabilities to their projects to improve the quality and performance of the application.

JSR 166 (Java Specification Request 166) is a specification on the Java platform to provide high -performance, scalable concurrent programming libraries.The back retrospective version is a function of developers who use the older Java versions in the early days so that they can use the JSR 166 framework in these versions.This article will introduce how to realize the retrospective of the JSR 166 framework in the Java library and provide the corresponding code example. To achieve the retrospective of the JSR 166 framework in the Java class library, you can use the "JSR166Y" class library developed by Doug Lea. It provides the early JSR 166 concurrent retrospective function for the early Java version.Here are the steps to realize the retrospective version: Step 1: Download jar package You can download the "jsr166" jar package from the Maven warehouse (https://mvnrepository.com/artifact/com.googleCode.jsr166) to add it to the classpath of your project. Step 2: Import the required classes Introduce the required classes, such as the class under the `java.util.concurrent` package, which contain the concurrent tools in the JSR 166 framework. ```java import java.util.concurrent.*; ``` Step 3: Use the backback class and interface Using the retrospective class and interfaces in the "JSR166Y" class library, they have the same function as the new version concurrent classes provided by the Java platform, but can be used in the old version of Java. For example, you can use the retrospective version of the `Executorservice` and` CompletionService` interface to implement parallel tasks: ```java ExecutorService executorService = Executors.newFixedThreadPool(5); CompletionService<Integer> completionService = new ExecutorCompletionService<>(executorService); ``` This enables you to use concurrent tasks to execute and obtain the characteristics of execution results in the old version of Java. Step 4: Written concurrent code You can use the concurrent tools provided by the retrospective class library to write a concurrent code, such as `Lock`,` Condition`, `Semaphore`,` Countdownlatch`, etc. The following is a simple example of using a back -back class library: ```java import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class BackportExample { private static Lock lock = new ReentrantLock(); public static void main(String[] args) { new Thread(() -> { lock.lock(); try { System.out.println ("Thread 1 obtained locks"); Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } finally { lock.unlock(); System.out.println ("Thread 1 releases locks"); } }).start(); new Thread(() -> { lock.lock(); try { System.out.println ("Thread 2 obtained locks"); } finally { lock.unlock(); System.out.println ("Thread 2 releases locks"); } }).start(); } } ``` The above code creates a re -incoming lock and demonstrated the acquisition and release operation of the lock through two threads. By using the JSR 166 framework, developers can enjoy the convenience of concurrent programming in the early version of Java.When introducing the retrospective version, ensure the compatibility of the Java version and the JSR 166 retrospective version of the application. Summarize: This article introduces how to achieve the retrospective of the JSR 166 framework in the Java library.We provide the corresponding steps and give a simple sample code that uses the retrospective library.Through these contents, developers can achieve high -performance, scalable concurrent programming in the older version of Java.

JSR 166 (Java Specification Request 166) is a standardized specification for concurrent tools in the Java library. It provides a series of tools for processing multi -threaded and concurrent programming.In the early version of Java, concurrent programming is not a task that is easy to achieve and control. Therefore, the emergence of JSR 166 fills the deficiencies of the Java class library in this regard, making concurrent programming simpler and efficient. In the retrospective version of the JSR 166 framework, the following key components and functions mainly include: 1. Executor framework: Executor framework provides a thread pool to handle the execution and scheduling of tasks.Through this framework, the execution of the task can be decoupled from the creation and management of threads to better control the use of threads and resource scheduling. Below is a simple Executor framework sample code: ```java import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ExecutorExample { public static void main(String[] args) { ExecutorService executor = Executors.newFixedThreadPool(5); for (int i = 0; i < 10; i++) { Runnable task = new Task(i); executor.execute(task); } executor.shutdown(); } } class Task implements Runnable { private int taskId; public Task(int taskId) { this.taskId = taskId; } @Override public void run() { System.out.println("Task " + taskId + " is executing."); } } ``` 2. Parallel collection: The JSR 166 framework provides a series of threaded sets of safe set class, such as ConcurrenThashmap, ConcurrentlinkedQueue, etc.These concurrent sets use some efficient concurrency control technology to make the operation of the collection more efficient and secure in the multi -threaded environment. The following is an example code using ConcurrenThashMap: ```java import java.util.concurrent.ConcurrentHashMap; public class ConcurrentHashMapExample { public static void main(String[] args) { ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("A", 1); map.put("B", 2); map.put("C", 3); int value = map.get("B"); System.out.println("Value of key 'B' is " + value); } } ``` 3. Synchronous tool class: The JSR 166 framework also provides some synchronous tool classes, such as Countdownlatch, SEMAPHORE, CyclicBarrier, etc.These tools can help us better control the execution order and collaboration of threads, making the task scheduling in the multi -threaded environment simpler and reliable. Below is an example code using countdownlatch: ```java import java.util.concurrent.CountDownLatch; public class CountDownLatchExample { public static void main(String[] args) { final int NUM_THREADS = 5; final CountDownLatch startSignal = new CountDownLatch(1); final CountDownLatch doneSignal = new CountDownLatch(NUM_THREADS); for (int i = 0; i < NUM_THREADS; i++) { Thread thread = new Thread(() -> { try { startSignal.await(); System.out.println("Thread " + Thread.currentThread().getId() + " is executing."); doneSignal.countDown(); } catch (InterruptedException e) { e.printStackTrace(); } }); thread.start(); } System.out.println("Waiting for threads to start."); startSignal.countDown(); try { doneSignal.await(); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("All threads have finished executing."); } } ``` The retrospective version of the JSR 166 framework provides a reliable and efficient solution for Java concurrent programming, making the task scheduling and concurrency operation in the multi -threaded environment easier and easier.

The JSR 166 framework is an important part of Java concurrent programming. It provides a set of powerful tools and classes to simplify multi -threaded programming and concurrent data structure operations.This article will go back to the history of the JSR 166 framework, and introduce its application in the Java class library through case analysis. The JSR 166 framework was first released in 2004 and became part of the Java class library in Java SE 5.This framework provides a series of thread -safe sets, including ConcurrenThashMap, ConcurrenTlinkedQueue, ConcurrentSklistMap, etc., as well as the Executor framework for concurrent task scheduling.Below we will use a specific case to show the application of the JSR 166 framework in the Java library. Assuming that we have a need, we need to read data from a large file and perform statistics. At the same time, multiple threads are required to process different parts of data.Without concurrent treatment, it may cause performance bottlenecks.By using the class provided by the JSR 166 framework, we can easily implement this demand. First of all, we can use ConcurrenThashMap as the data structure of the storage statistics. It not only supports efficient concurrent reading, but also ensures thread security for writing operations. The following is an example code: ```java ConcurrentHashMap<String, Integer> wordCountMap = new ConcurrentHashMap<>(); class WordProcessor implements Runnable { private String[] words; public WordProcessor(String[] words) { this.words = words; } @Override public void run() { for (String word : words) { wordCountMap.compute(word, (key, value) -> value == null ? 1 : value + 1); } } } // Assume that the large file has been divided by the line, and each row is stored as a string in the list List<String> lines = Files.readAllLines(Paths.get("large_file.txt")); ExecutorService executor = Executors.newFixedThreadPool(4); // Divide the file data to 4 parts, and each part is handed over to one thread to process int partitionSize = lines.size() / 4; for (int i = 0; i < 4; i++) { int startIndex = i * partitionSize; int endIndex = (i + 1) * partitionSize; String[] words = lines.subList(startIndex, endIndex).stream() .flatMap(line -> Arrays.stream(line.split(" "))) .toArray(String[]::new); executor.execute(new WordProcessor(words)); } executor.shutdown(); executor.awaitTermination(1, TimeUnit.MINUTES); // Output statistics results for (Map.Entry<String, Integer> entry : wordCountMap.entrySet()) { System.out.println(entry.getKey() + ": " + entry.getValue()); } ``` In the above code, we first created a statistical result of the CONCURRENTHASHMAP to store the number of times.Then, we created a WordProcessor class that implements the Runnable interface to handle statistics for handling array.Next, we created a thread pool using the Executor framework and divided the file data into 4 parts, each part was treated by one thread.When each thread is processed, the compute method of ConcurrenThashmap uses the compute method to update the statistical results. Finally, we wait for all threads to complete the processing task, and then output statistical results.In this way, we use the concurrent tools and classes provided by the JSR 166 framework to achieve the needs of high -efficiency multi -threaded concurrent processing large files. Through the above cases, we can see the application advantage of the JSR 166 framework in the Java class library.It provides developers with a set of high -performance, thread security concurrent tools and classes, which greatly simplifies the complexity of multi -threaded programming and concurrent data operations.Whether it is to deal with a large amount of data, high and send access to shared resources, or to achieve asynchronous task scheduling, the JSR 166 framework can help us easily cope with the challenges of various concurrent programming.

How to use the retrospective version of the JSR 166 framework in the Java Library introduction: The JSR 166 is a group of concurrent tools provided in the Java class library, which aims to simplify the complexity of concurrent programming.In order to solve the common problems in multi -threaded programming, the JSR 166 framework introduced some important complication and data structure.However, in some cases, we may need to use the retrospective version of the JSR 166 framework to use these concurrent tools in the old version of the Java application.This article will introduce in detail how to use the retrospective of the JSR 166 framework and provide some Java code examples. Step 1: Download the retrospective version of the JSR 166 framework First, we need to download the retrospective version of the JSR 166 framework.You can find JAR files from the retrospective version from the Java ConcurrenCy Downloads website (https://gee.osWego.edu/dl/concurrency-nterest/).Select the retrospective version of your Java version and download it. Step 2: Import the JSR 166 framework of retrospective version Once you download the JAR file of the JSR 166 framework, you can import it into your Java project.In most IDE (integrated development environment), you can import the jar file through the following steps: -Colon a folder called "lib" (or similar) in the project. -Put the JAR file of the JSR 166 framework back to the folder. -Cose your project in the ID and right -click. -This to build path and select the "Configure Build Path" option. -Cap on the "Libraries" tab, click the "Add Jars" button under "ClassPath". -Review and select the JSR 166 framework in the "LIB" folder. -Click "Apply" or "OK" (OK) button to complete the import. Step 3: Use the JSR 166 framework with the retrospective version Once you successfully import the JSR 166 framework, you can start using the concurrent tools.Here are examples of common concurrent tools for JSR 166 frameworks that use the retrospective version: Example 1: Use the Lock interface of the retrospective version ```java import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class LockExample { private static Lock lock = new ReentrantLock(); public static void main(String[] args) { // Get the lock lock.lock(); try { // Execute the code that needs to be synchronized System.out.println("Locked section"); } finally { // Release the lock lock.unlock(); } } } ``` Example 2: Use the Condition interface of the retrospective version ```java import java.util.concurrent.locks.Condition; import java.util.concurrent.locks.Lock; import java.util.concurrent.locks.ReentrantLock; public class ConditionExample { private static Lock lock = new ReentrantLock(); private static Condition condition = lock.newCondition(); public static void main(String[] args) { // Get the lock lock.lock(); try { // Execute the code of waiting conditions System.out.println("Before await"); condition.await(); System.out.println("After await"); } catch (InterruptedException e) { e.printStackTrace(); } finally { // Release the lock lock.unlock(); } } } ``` in conclusion: In this article, we have learned how to use the retrospective of the JSR 166 framework in the Java class library.We downloaded and introduced the JSR 166 framework of the retrospective version, and provided some basic complicated tools for example code, including Lock and Condition interfaces.By understanding and using the JSR 166 framework, we can better process the complexity of concurrent programming in the old version of the Java application.I hope this article will be helpful to your learning concurrent programming!

The release history of the JSR 166 frame retrospective version of the JSR 166 framework in the java class library The JSR 166 is part of concurrent programming in the Java class library. It provides a set of reused classes to simplify the development process of concise concurrent programming.In the JSR 166 framework, the retrospective version refers to a backward library provided by the concurrent function on the old Java platform. The following is the release history and update log of the JSR 166 framework back retrospective: 1. Java 5： -It introduced Java.util.Concurrent packages, which contain a large number of classes and interfaces used for concurrent programming, such as Executor frameworks, concurrent collection, atomic variables, etc. 2. Java 6： -In the release of Java 6 updated the class library provided by the JSR 166, adding a new concurrency collection class, such as the ConcurrentLINKEDEQUE, LinkedTransferqueue, etc. -Pripped the concurrent blocking queue class linkedBlockingDeque, ArrayBlockingQueue, etc. -The introduced ThreadPoolexecutor class to manage the thread pool. -Su new synchronous tools COUNTDOWLATCH, SEMAPHORE, etc. 3. Java 7： -Accosted the Forkjoin framework to handle parallel calculations for processing division tasks. -The Phaser class is introduced for thread stage synchronization. -This provides the TransferQueue interface to support more efficient producers-consumer model. -Che more concurrent sets, such as ConcurrentskiplistSet, ConcurrentskiplistMap, etc. -The ThreadLocalrandom class was introduced to generate random numbers. 4. Java 8： -The CompletableFuture class is introduced for combined asynchronous programming. -In new method of increasing concurrency, such as ConcurrenThashmap. -The new time API is introduced, which provides delay and timing functions for concurrent tasks. The above is the release history and update logs of the JSR 166 framework retrospective version.Through continuous iteration and update, the JSR 166 provides a set of powerful concurrent programming tools, making it easier for developers to write high -efficiency and secure multi -threaded applications. Here are some examples of Java code in some JSR 166 framework libraries: 1. Executor framework example: ```java import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ExecutorExample { public static void main(String[] args) { ExecutorService executorService = Executors.newFixedThreadPool(5); for (int i = 0; i < 10; i++) { Runnable worker = new WorkerThread("" + i); executorService.execute(worker); } executorService.shutdown(); while (!executorService.isTerminated()) { } System.out.println ("All threads are executed"); } } class WorkerThread implements Runnable { private String name; public WorkerThread(String name) { this.name = name; } @Override public void run() { System.out.println (thread.currentthread (). Getname () + "starts the task" + name); try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println (thread.currentthread (). Getname () + "completes the task" + name); } } ``` 2. Example of concurrent set class: ```java import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.CopyOnWriteArrayList; public class ConcurrentCollectionsExample { public static void main(String[] args) { ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("A", 1); map.put("B", 2); map.put("C", 3); System.out.println("ConcurrentHashMap: " + map); CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>(); list.add("A"); list.add("B"); list.add("C"); System.out.println("CopyOnWriteArrayList: " + list); } } ``` The above example shows how the class libraries provided by the JSR 166 framework are programs, including the Executor framework to manage the thread pool, as well as the use class of concurrenThashmap and CopyonWriteArrayList. It is hoped that this article will help understand the release of the release of the JSR 166 framework, and the use of the concurrent programming tools provided by it.