Java API for XML Processing (referred to as JAXP) is the Java framework for processing XML.It provides a set of APIs for analysis, generation, conversion, and verification of XML documents.JAXP is part of the Javaee platform that can be used in Java applications and Java Applet. JAXP's technical principles mainly involve three aspects: parser (Parser), document object models (DOM) and Transformer. The parser is one of the core components used by JAXP to analyze XML documents.It converts the XML document into an internal representation form that can be read and operated by the program.JAXP supports two parsers: DOM parser and SAX parser.The DOM parser loads the entire XML document to the memory. It is represented by a tree structure, allowing the application to easily traverse and modify the document.The SAX parser uses an event -driven method to analyze the XML document, read the XML node one by one, and trigger the corresponding event callback method. It is suitable for large XML documents and performance -sensitive environments. Document object model (DOM) is a standard interface used by JAXP to represent XML documents.It provides a layered, object -based method to operate XML documents.DOM represents the entire XML document as a node tree, and each node is an object with attributes and methods.Developers can traverse, query and modify the content of XML documents by operating the DOM. The converter is a component for JAXP to convert XML documents.It can convert one XML document into another XML document, HTML document, text document or binary document.JAXP provides an XSLT converter to convert the XML document through the XSLT style table.Developers can use XSLT to convert the structure, content and style of the XML document to generate formats that meet their needs. Here are some examples of Java code using JAXP: 1. Use the DOM parser to parse the XML document: ```java // Import jaxp -related classes import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.DocumentBuilder; import org.w3c.dom.Document; import org.w3c.dom.NodeList; import org.w3c.dom.Node; // Create a DocumentBuilderFactory object DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // Create the DocumentBuilder object DocumentBuilder builder = factory.newDocumentBuilder(); // Use documentbuilder to parse XML documents Document document = builder.parse(new File("input.xml")); // Get the root node Node root = document.getDocumentElement(); // Traversing sub -nodes NodeList nodeList = root.getChildNodes(); for (int i = 0; i < nodeList.getLength(); i++) { Node node = nodeList.item(i); // Process node data ... } ``` 2. Use the XSLT converter to convert XML documents: ```java // Import jaxp -related classes import javax.xml.transform.TransformerFactory; import javax.xml.transform.Transformer; import javax.xml.transform.Source; import javax.xml.transform.Result; import javax.xml.transform.stream.StreamSource; import javax.xml.transform.stream.StreamResult; // Create transformerFactory objects TransformerFactory factory = TransformerFactory.newInstance(); // Create Transformer Object Transformer transformer = factory.newTransformer(new StreamSource("stylesheet.xsl")); // Create a source object Source input = new StreamSource("input.xml"); // Create a Result object Result output = new StreamResult("output.xml"); // Execute XML conversion transformer.transform(input, output); ``` In short, the Java API For XML Processing is a powerful XML processing framework. It provides rich functions through parsers, document object models and converters to analyze, generate, convey, and verify XML documents to facilitate developers processing and operating XML data.Essence

In -depth understanding of the technical principles of the local radio manager in the Android support library Android's Local Broadcast Manager is a powerful tool in the Android support library. It provides a lightweight way to send and receive broadcast messages inside the application.The local broadcast manager is safer and efficient than the Global Broadcast Manager. It only sends the broadcast event to the internal receiver of the application without leaking it to other applications. This article will explore the technical principles of the local broadcast manager in the Android support library and provide some Java code examples to help understand. 1. The working principle of the local broadcast manager The working principle of local broadcasting managers is relatively simple.When an internal component (such as Activity, Service, etc.) sends a local broadcast, the local broadcast manager is responsible for notifying the broadcast event to the receiver registered in the same application. The following is the main principle of the local broadcast manager: 1. Create an instance of a local broadcast manager: To obtain a singles instance of the local broadcast manager through LocalBroadCastManager.Getinstance (Context) method. 2. Registered broadcast recipient: Call the broadcast receiver to the local broadcast manager by calling the registerReceiver (BroadcastReceiver, IntentFilter) method. 3. Send local broadcasting: Send local broadcast by calling SendbroidCast (INTENT) or SendbroidSync (INTENT) method. 4. Receive broadcast: Registered broadcast receivers will receive matching broadcast events. Second, the advantages of the local broadcast manager Compared to the global broadcast manager, the local broadcast manager has the following main advantages: 1. Safety: Global broadcasting can be accepted by other applications, which may lead to security loopholes.The local broadcast is only sent and received inside the application, and the security is higher. 2. Efficiency: Global broadcasting needs to scan and filter all applications, and local broadcasts only need to scan and filter inside the application to perform higher execution efficiency. 3. Flexibility: Local broadcasting managers only pay attention to radio events within the application, so it is easier to integrate and manage. 3. Java code example of the local broadcast manager The following is a simple Java code example, which shows how to use the local broadcast manager to send and receive broadcast events in the application: 1. Registered broadcast receiver: ``` private BroadcastReceiver myReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { // Treatment the receiving broadcast event } }; // Register a broadcast receiver in the onCreate method @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); LocalBroadcastManager.getInstance(this).registerReceiver(myReceiver, new IntentFilter("myAction")); } // Cancel the registered broadcast receiver in the ONDESTROY method @Override protected void onDestroy() { super.onDestroy(); LocalBroadcastManager.getInstance(this).unregisterReceiver(myReceiver); } ``` 2. Send local broadcast: ``` // Create an INTENT object and set the broadcast of ACTION Intent intent = new Intent("myAction"); // Send local broadcast LocalBroadcastManager.getInstance(this).sendBroadcast(intent); ``` Through the above examples, we can see that the usage of local broadcasting managers is very simple and intuitive. in conclusion The local broadcast manager is a powerful tool in the Android support library that can safely and efficiently send and receive broadcast events inside the application.Compared with the global broadcast manager, the local broadcast manager provides better security, efficiency and flexibility.We hope that this article can help readers understand the technical principles of local broadcasting managers in depth and apply flexibly in actual development.

In the Java library, the Reflections framework is widely used to deal with the performance problems caused by reflection.Reflection is a powerful function in the Java language. It can obtain and operate information at runtime, and dynamically create objects, call methods, etc.However, reflection operations usually bring performance loss, especially when a large amount of reflection operation is required.The emergence of the REFLECTIONS framework provides a feasible solution for solving this problem. The purpose of the REFLECTIONS framework design is to obtain all class information by scanning the path during runtime without the need to use an explicit reflection operation.This method avoids frequent use of reflection during runtime, thereby improving performance.The following will introduce some practical methods of the REFLECTIONS framework in solving the performance problems brought by reflection. 1. Use Reflections to obtain specific types of information: The REFLECTIONS framework provides a convenient API to obtain all classes under a package, specified annotations, and classes that implement specific interfaces.Through these APIs, we can quickly obtain the required class information without explicit reflection operations. ```java // Use the Reflections framework to obtain all category information Reflections reflections = new Reflections("com.example.package"); Set<Class<?>> classes = reflections.getSubTypesOf(Object.class); ``` 2. Use Reflections to obtain a specific type of method and field information: Through the REFLECTIONS framework, we can easily obtain all the methods and field information in a certain class without using the explicit reflex operation.This is very useful when requiring the methods and fields in the class and fields. ```java // Use the Reflections framework to get all the method information of a certain class Reflections reflections = new Reflections("com.example.package"); Set<Method> methods = reflections.getMethodsAnnotatedWith(MyAnnotation.class); ``` 3. Use Reflections to scan all the classes under the path: The Reflections framework can scan all the classes under the class path to get all the information in the system.This is very useful when it is necessary to perform class level operations throughout the system.At the same time, the REFLECTIONS framework caches the result of scanning, avoiding repeated scanning and improving performance. ```java // Use the REFLECTIONS framework to scan all the classes under the path Reflections reflections = new Reflections("com.example.package"); Set<Class<?>> classes = reflections.getSubTypesOf(Object.class); ``` 4. Use Reflections to optimize the performance of the reflection operation: The REFLECTIONS framework also provides some optimized performance methods. For example, by configuring custom scanners (Scanner), you can specify only scanning specific classes or specific annotations, thereby reducing unnecessary scanning and analysis. ```java // Use the Reflections framework to configure a customized scanner Reflections reflections = new Reflections(new ConfigurationBuilder() .setUrls(ClasspathHelper.forPackage("com.example.package")) .setScanners(new SubTypesScanner(), new TypeAnnotationsScanner())); Set<Class<?>> classes = reflections.getSubTypesOf(Object.class); ``` Through the above practical methods, we can make full use of the Reflections framework to solve the performance problems caused by reflection.By trying to avoid explicit reflection operations, the API and optimization methods provided by the REFLECTIONS framework can significantly improve the code performance and simplify the use of reflex operations.

Exploration of the technical principles in the UJO ORM Java Library introduction: UJO ORM is a powerful Java class library that is used to achieve object relationship mapping (ORM) in Java applications.It provides many useful functions so that developers can easily interact with object -oriented programming models with relational databases.This article will explore the technical principles of UJO ORM and how to use Java code to implement these principles. 1. Overview of ORM: ORM (object relationship mapping) is a technology that converts the data model between object models in object -oriented programming language and relational databases.ORM originated from the pain points of data operations to developers in the relationship database. It simplifies the process of data persistence by mapping the object with the database table. 2. UJO ORM working principle: UJO ORM's working principle is based on the following core concepts and technologies: 1. Map of annotations: UJO ORM uses annotations to define the mapping relationship between the Java class and the database table.By using annotations in the Java class, developers can specify which database tables are used and how to maximize each attribute.For example, the name of the@Table annotation specifies the name of the database table,@column annotation specifies the name of the attribute and the name in the table. Example code: ```java @Table(name = "user") public class User { @Column(name = "id") public int id; @Column(name = "name") public String name; @Column(name = "email") public String email; } ``` 2. Database operation package: UJO ORM encapsulates the underlying database operation, including database connection, the generation and execution of SQL statements.It provides a series of easy -to -use methods, such as Save (), UPDATE (), Delete (), etc., so that developers can perform long -lasting operations on Java objects without writing tedious SQL statements. Example code: ```java User user = new User(); user.id = 1; user.name = "John"; user.email = "john@example.com"; UjoEntityManager entityManager = new UjoEntityManager(); entityManager.save(user); ``` 3. Affairs management: UJO ORM also provides the function of transaction management to ensure data consistency in multiple database operations.By using annotations, developers can mark multiple operations as a transaction.At the time of the transaction, the UJO ORM ensures that the execution results of all operations are either successful or rolled back. Example code: ```java @Transactional public void updateUserEmail(int userId, String newEmail) { User user = entityManager.find(User.class, userId); user.email = newEmail; entityManager.update(user); } ``` 4. Query language support: UJO Orm provides SQL -like query language, allowing developers to flexibly retrieve data in the database.This query language supports basic CRUD (creation, reading, updating, deleting) operations, and also supports complex query conditions and related query. Example code: ```java Query<User> query = entityManager.createQuery(User.class); query.where("name = :name").setParameter("name", "John"); List<User> users = query.list(); ``` 3. Conclusion: UJO ORM is a powerful and flexible Java class library. Through annotation -based mapping, database operation packaging, transaction management, and query language support, it provides a convenient object relationship mapping function.It simplifies the interaction between developers and relational databases and improves development efficiency.If you are preparing to develop a Java application and need to interact with relational databases, then UJO ORM will be a choice worth considering.

Introduction and comparison of command line processing frameworks commonly used in the Java class library When developing Java applications, command lines are a common way of interaction.To implement the analysis and processing of command line parameters, developers can use some commonly used Java libraries.This article will introduce several commonly used command line processing frameworks and compare them. 1. Apache Commons CLI Apache Commons Cli is a popular Java command line parameter processing framework.It provides a set of simple and easy -to -use APIs for analysis and processing command line parameters.Using Apache Commons Cli, developers can define options, parameters, help information, etc., and analyze it through the command line parser.The following is an example of using Apache Commons Cli: ```java import org.apache.commons.cli.*; public class CommandLineParserExample { public static void main(String[] args) { Options options = new Options(); options.addOption("h", "help", false, "Display help"); CommandLineParser parser = new DefaultParser(); HelpFormatter formatter = new HelpFormatter(); try { CommandLine cmd = parser.parse(options, args); if (cmd.hasOption("h")) { formatter.printHelp("myprogram", options); System.exit(0); } } catch (ParseException e) { System.out.println("Invalid arguments. Use -h or --help for usage."); System.exit(1); } // Make other business processing } } ``` 2. JCommander JCOMMANDER is another popular command line processing framework, which provides an annotation driver to define the command line parameters.JCOMMANDER can automatically analyze the command line parameters based on the defined annotation and pass the results to the corresponding processing method.The following is an example of using JCOMMANDER: ```java import com.beust.jcommander.JCommander; import com.beust.jcommander.Parameter; public class CommandLineParserExample { @Parameter(names = { "-h", "--help" }, description = "Display help") private boolean help; public static void main(String[] args) { CommandLineParserExample example = new CommandLineParserExample(); JCommander.newBuilder() .addObject(example) .build() .parse(args); if (example.help) { JCommander.newBuilder() .addObject(example) .build() .usage(); System.exit(0); } // Make other business processing } } ``` 3. picocli Picocli is an emerging command line processing framework that provides simple and easy -to -use APIs and annotations to resolve the command line parameters.Compared with the previously introduced framework, Picocli has richer features, such as parameter verification and automatic generating help information.The following is an example of using picocli: ```java import picocli.CommandLine; import picocli.CommandLine.Command; import picocli.CommandLine.Option; @Command(name = "myprogram", description = "This is a program") public class CommandLineParserExample implements Runnable { @Option(names = { "-h", "--help" }, usageHelp = true, description = "Display help") private boolean help; public static void main(String[] args) { CommandLine.run(new CommandLineParserExample(), args); } @Override public void run() { if (help) { CommandLine.usage(this, System.out); System.exit(0); } // Make other business processing } } ``` In the above example, we use the annotations provided by Picocli to define the options and parameters, and analyze and processes through the method of `Commandline.run ()`. The above is the introduction and example of several commonly used Java command line processing frameworks.They have their own characteristics and advantages, and developers can choose the appropriate framework according to their needs to process the command line parameters.Whether it is Apache Commons Cli, JCOMMANDER or Picocli, they can help developers to achieve simple and efficient command -line interaction.

The UJO ORM framework is an object relationship mapping framework widely used in the Java library.It has some important technical principles that make it very efficient and flexible when dealing with database operations.This article will analyze the technical principles of the UJO ORM framework and provide the corresponding Java code example. 1. EO (Entity Object) model: The UJO ORM framework adopts an EO model, which maximize the database table as a Java class and map each line of data in the table to an instance object in this class.By using the EO model, the database can be easily operated.The following is a simple example code: ``` public class Employee extends Ujo { public static final Key<Employee, Long> ID = newKey($ID); public static final Key<Employee, String> NAME = newKey($NAME); public static final ListKey<Employee, Project> PROJECTS = newListKey($PROJECTS); public Long getId() { return get(ID); } public void setId(Long id) { set(ID, id); } public String getName() { return get(NAME); } public void setName(String name) { set(NAME, name); } public List<Project> getProjects() { return getList(PROJECTS); } public void setProjects(List<Project> projects) { setList(PROJECTS, projects); } } ``` The above code defines a physical class called Employee, which has attributes such as ID, name, and projects.In the UJO ORM framework, use the key class definition attributes, and use the get () and set () methods to operate. 2. Database operation API: The UJO ORM framework provides a powerful API for performing various database operations.For example, you can use the save () method to save an object into the database, delete an object with the delete () method, and use the Find () method to query the object that meets specific conditions.The following is an example code that saves the Employee object: ``` Employee employee = new Employee(); employee.setId(1L); employee.setName("John Doe"); Session session = new Session(); session.save(employee); ``` The above code creates a new Employee object and saves it into the database. 3. Powerful query function: The UJO ORM framework provides a rich query function, which can easily perform various complex query.For example, you can use the CRITERION class definition query conditions, use the order of order to define the sorting rules, and use the Project class definition projection query.The following is an example code that query the Employee object: ``` Criterion criterion = Criterion.where(Employee.NAME, Operator.LIKE, "John%"); List<Employee> employees = session.createQuery(Employee.class) .add(criterion) .list(); ``` The above code creates a query that will return all Employee objects that start with "John". 4. Relations mapping: The UJO ORM framework supports multiple relationship mapping, including one -to -one, one -to -many, more to one and more pairs.By defining appropriate attributes and relationship mapping, complex database relationships can be easily handled.The following is a sample code of multi -relationship mapping: ``` public class Project extends Ujo { public static final Key<Project, Long> ID = newKey($ID); public static final Key<Project, String> NAME = newKey($NAME); public static final Key<Project, Employee> MANAGER = newKey($MANAGER); public Long getId() { return get(ID); } public void setId(Long id) { set(ID, id); } public String getName() { return get(NAME); } public void setName(String name) { set(NAME, name); } public Employee getManager() { return get(MANAGER); } public void setManager(Employee manager) { set(MANAGER, manager); } } ``` The above code defines a physical class called Project, which contains a manager attribute.Through this relationship mapping, the manager of a project can be easily found. In summary, the technical principles of the UJO ORM framework in the Java class library make it a powerful, flexible and easy -to -use object relationship mapping framework.By using the EO model, database operation API, powerful query function and flexible relationship mapping, developers can efficiently perform database operations.

How to use the command line processing framework in the Java class library Command line processing is the need often encountered when developing Java applications.In order to simplify the processing process and improve efficiency, the command line processing framework in the Java class library can be used.This article will introduce how to use these frameworks to easily process the command line input and output. 1. The role and advantage of the command line processing framework The command line processing framework can help us analyze the row parameters, process input and output, process abnormalities, and generate help documents.The benefits of using the command line to process the framework include the following points: 1. Simplify the analysis process of the command line parameters to make the code easier to read, write and maintain. 2. Provide rich options and marks that can customize the rules and formats of command line parameters. 3. Supporting powerful errors and abnormal processing mechanisms can flexibly handle various errors. 4. It can help us generate standardized help documents and provide users for reference. 2. Common command line processing framework 1. Apache Commons Cli: This is a popular open source command line processing framework, which provides rich options and tag analytics functions.You can introduce it into the project through Maven or Gradle. 2. Picocli: This is another powerful Java command line processing framework that can easily analyze the command line parameters and provide a convenient function of simplifying development.It can also be introduced through Maven or Gradle. Third, sample code Below is an example code that uses Apache Commons Cli and Picocli framework to process command lines: 1. Use Apache Commonts Cli: ``` import org.apache.commons.cli.*; public class CommandLineExample { public static void main(String[] args) { Options options = new Options(); options.addOption("h", "help", false, "Display help information"); CommandLineParser parser = new DefaultParser(); try { CommandLine cmd = parser.parse(options, args); if (cmd.hasOption("help")) { // Print help information HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("java -jar application.jar", options); } } catch (ParseException e) { System.err.println("Error: " + e.getMessage()); } } } ``` 2. Use picocli: ``` import picocli.CommandLine; import picocli.CommandLine.Command; import picocli.CommandLine.Option; @Command(name = "application", mixinStandardHelpOptions = true) public class CommandLineExample implements Runnable { @Option(names = {"-n", "--name"}, required = true, description = "Your name") private String name; public static void main(String[] args) { CommandLine.run(new CommandLineExample(), args); } @Override public void run() { System.out.println("Hello, " + name + "!"); } } ``` The above example code demonstrates how to use Apache Commons Cli and Picocli frameworks to process command line parameters, and how to generate help documents.When using it, you can choose the appropriate framework according to the actual needs and perform corresponding configuration and adjustment. Fourth, summary By using the command line processing framework in the Java class library, we can easily process the command line input and output, simplify the code development process, and provide a good user experience.This article introduces two commonly used command line processing frameworks and provides example code to demonstrate its basic usage.According to specific needs, select the appropriate framework, and refer to the official document for more detailed configuration and use.

The Jetty framework provides a simple, flexible and efficient way to develop Java Web applications.Through Jetty's Servlet annotation, developers can more conveniently define and mappore the service, thereby reducing the complexity and workload of development. The Servlet annotation is a new feature introduced in the Java Servlet 3.0 specification. It allows developers to use annotations to replace the traditional web.xml file configuration method to define and configure service.In the Jetty framework, the use of the service annotation can more intuitively map the Servlet to the URL path, making the development more fast and easy to maintain. Below is a simple example of using the server annotation: ```java import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.annotation.WebServlet; @WebServlet("/hello") public class MyServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html><body>"); out.println("<h1>Hello, Jetty!</h1>"); out.println("</body></html>"); } } ``` In this example, we created a Servlet class called `MyServlet`, and used the` @WebServlet ("/Hello") `` `The URL path of the server is`/hello`.This means that when visiting the `http:// localhost: 8080/hello`, Jetty will automatically forward the request to the servlet processing. In the `doget` method, we obtain the output stream through` response.getWriter () `, and use the` Out.println` method to output HTML content to the client.In this example, we output a simple greeting "Hello, Jetty!". To use the service annotation in the Jetty framework, we need to add the related dependencies of the Service 3.0 under the project of the project, and configure the Jetty container to support the service annotation when starting.The following is a simple sample code that shows how to use Jetty to start a web application that supports the service annotation: ```java import org.eclipse.jetty.server.Server; import org.eclipse.jetty.servlet.DefaultServlet; import org.eclipse.jetty.servlet.ServletContextHandler; import org.eclipse.jetty.annotations.ServletContainerInitializerStarter; public class Main { public static void main(String[] args) throws Exception { // Create the Jetty server Server server = new Server(8080); // Create the context of service ServletContextHandler context = new ServletContextHandler(); context.setContextPath("/"); // Enable the service annotation configuration context.setAttribute("org.eclipse.jetty.containerInitializers", new ContainerInitializerStarter[] { new ContainerInitializerStarter(new MyContainerInitializer()) }); // Add the default service to handle static resources context.addServlet(DefaultServlet.class, "/"); // Set the server's processor to the context of the server server.setHandler(context); // Start the jetty server server.start(); server.join(); } } ``` In this example, we first create a Jetty server, and specify the ductive port number 8080.Next, we created a SERVLET context and set its path to the root path "/".In this context, we enabled the Servlet annotation configuration and created an object of `Containerinitializerstarter` in a customized` MyContainerinitializer`. Finally, we added the default service to handle static resources and set the Servlet context to the processor of the server.In this way, when we start the Jetty server, it will be loaded and registered with the service of the service annotation, and can handle requests from the client. In summary, the JAVA web application's development and configuration can be simplified in the Jetty framework.By using the Servlet annotation, developers can more intuitively define and map the service, and reduce the tedious XML configuration work.I hope this article will help you understand the use of Servlet annotations in the Jetty framework.

Interpretation of the technical framework of the low delayed original concurrent queue based on the Java class library Abstract: Low latency original concurrent queue is a technical framework that can efficiently handle concurrent operations.This article will introduce the principles and usage methods of low delayed original concurrent queues based on the Java class library, and provide corresponding Java code examples. 1 Introduction Low delayed original concurrent queue is a high -performance, high -combined queue data structure, which is used to store and access data in a multi -threaded environment.Its main features are the advantages of low latency, high throughput, and thread safety.In practical applications, low-delayed primitive concurrent queue can be used to achieve high-combined producers-consumer models, and improve the response speed and processing capacity of the system. 2. Principles The core principle of low delayed primitive concurrent queue is based on atomic variables and synchronization mechanisms in Java to achieve thread safety and efficient concurrent access.It uses a non -blocking algorithm to achieve the atomic operation of data through CAS operations (comparison and exchange), thereby avoiding the competition of locks and improving concurrency performance.At the same time, it also ensures the visibility and consistency of the data based on the memory model of Java. 3. How to use Below is a simple example code that demonstrates how to use the low -delayed original concurrent queue based on the Java class library. ```java import java.util.concurrent.ConcurrentLinkedQueue; public class LowLatencyQueueExample { public static void main(String[] args) { // Create a low delayed original concurrent queue object ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<>(); // Producer thread Thread producerThread = new Thread(() -> { for (int i = 0; i < 10; i++) { String data = "Data " + i; queue.offer (data); // Add data to the queue System.out.println("Produced: " + data); try { Thread.sleep (1000); // Simulates product consumption time } catch (InterruptedException e) { e.printStackTrace(); } } }); // Consumer thread Thread consumerThread = new Thread(() -> { while (true) { String data = queue.poll (); // Take the data from the queue if (data != null) { System.out.println("Consumed: " + data); // Consumption operation } try { Thread.sleep (1000); // Simulation consumption time consumption time consumption time } catch (InterruptedException e) { e.printStackTrace(); } } }); // Starters and consumer threads producerThread.start(); consumerThread.start(); } } ``` In the above code, we created a CONCURRENTLINKEDQUEUE object as a low -delayed original concurrent queue, and then created producer threads and consumer threads.The producer thread adds the data to the queue through the `Offer` method. The consumer thread takes the data from the queue to consume through the queue through the` Poll` method.In this way, producers and consumers can operate concurrently to achieve efficient concurrent treatment. 4. Summary Low delayed original concurrent queue is a high -performance, high -combined queue technology, which is suitable for data storage and access to data in a multi -threaded environment.This article introduces the principles and usage methods of low delayed primitive concurrent queues based on the Java class library, and provides corresponding Java code examples.By mastering and applying low delayed original concurrency queue technology, the concurrent performance and response speed of the system can be improved to meet the needs of high concurrency in the scene.

Principles of low delayed original concurrent queue based on the Java class library Summary: In the application scenarios that are increasingly high and real -time requirements today, the original concurrent queue has become one of the important tools for achieving low latency.This article will introduce the principle of low delayed original concurrency queue based on the Java class library, and provide relevant Java code examples. 1 Overview The original concurrent queue is an unbounded queue that can achieve efficient multi -producer and multi -consumer model.It is designed based on the "single producer-single consumer" model, that is, each queue has only one producer and one consumer.This design can reduce the competition of locks and improve concurrency efficiency. 2. Principles The low latency in the Java class library mainly depends on the following key technical points: 2.1 No lock queue In order to achieve low latency and high composite performance, the original concurrent queue uses the data structure of the lock -free queue.The lock -free queue implements the operation of the queue through the operation of the CAS (Compaare and Swap) to avoid the performance loss caused by the lock. 2.2 memory barrier Memory barrier is a type of hardware instruction, which can ensure the execution order of the instruction sequence and refresh the cache at the same time.In the original concurrent queue, the use of memory barrier can ensure the visibility and order of data, and to avoid problems caused by the re -arrangement of instructions. 2.3 Caches Fill The cache line is a memory read and write unit in a computer, usually 64 bytes.Due to the storage method of the cache line, the modification of a mito -deposit will affect other data in the same cache.The original concurrent queue uses cache -filling technology to distribute the data of the producer and consumers in different cache lines, avoiding the pseudo -sharing of the data and improving the concurrency performance. 3. Java code example The following is a simple example of the low latency original concurrent queue based on the Java class library: ```java import java.util.concurrent.ConcurrentLinkedQueue; public class LowLatencyQueueExample { private static ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<>(); public static void main(String[] args) throws InterruptedException { Thread producerThread = new Thread(() -> { for (int i = 0; i < 100; i++) { queue.offer(i); } }); Thread consumerThread = new Thread(() -> { for (int i = 0; i < 100; i++) { Integer value = queue.poll(); System.out.println("Consumed: " + value); } }); producerThread.start(); consumerThread.start(); producerThread.join(); consumerThread.join(); } } ``` In the above examples, we use the `ConcurrentlinkEdqueue` class as the implementation of the original concurrent queue. The` Offer () method is used to add the data to the queue, and the method is used to obtain data from the queue. By running the above examples, consumers can obtain data in time after the production data is produced, achieving a low -delayed concurrent queue effect. in conclusion: The low -delayed original concurrent queue based on the Java class library is an important tool for achieving high -efficiency multi -producers and multi -consumer models.It uses key technologies such as lock -free queue, memory barrier, and cache filling to improve concurrent performance and reduce delay.Developers can choose the appropriate concurrency queue according to specific needs, such as `ConcurrentLinkedQueueme`,` Disrutor`, etc.