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Technical Articles

Java

How to convert an array to an ArrayList in Java

Use Arrays.asList() combined with ArrayList constructor to convert an object array into a mutable ArrayList; 2. For basic arrays such as int[], it is necessary to convert through manual loops or Java8's Arrays.stream().boxed().collect(); 3. Use streams to also implement filtering and mapping operations during conversion. You should select the appropriate method based on the array type and whether you need to modify the list, and finally get a dynamically adjustable ArrayList object.

Sep 10, 2025 am 04:42 AM

Java selection sorting: step by step display of algorithm execution process

This tutorial explains in detail how to implement the selection sorting algorithm in Java, and highlights how to modify existing code to print the current state of the array after each iteration is completed. By adding print statements to the main sort loop, users can clearly track each step of the algorithm to better understand how the selection sort works.

Sep 10, 2025 am 04:12 AM

What is a try-with-resources statement in Java?

Atry-with-resourcesstatementinJavaautomaticallyclosesresourcesthatimplementAutoCloseableorCloseable,preventingresourceleaks.1.Declareoneormoreresourcesinthetryclause.2.Theseresourcesareautomaticallyclosedinreverseorderoftheirdeclaration.3.Itworkseven

Sep 10, 2025 am 03:52 AM

Search strategy for custom object properties in Java ArrayList

This tutorial explores in-depth strategies for finding specific properties (such as names) in Java ArrayList based on custom objects (such as Product). It explains why this function cannot be achieved directly using ArrayList.contains(String) and provides three effective implementation solutions: direct search based on loop iteration, functional search using the Java 8 Stream API, and efficient and fast search methods by building HashMap, aiming to help developers choose the most suitable search mechanism for their scenarios.

Sep 10, 2025 am 03:51 AM

What is the difference between method overloading and method overriding in Java?

Methodoverloadingandmethodoverridingdifferprimarilyintheirimplementationandpurpose:overloadinginvolvesmultiplemethodsinthesameclasswiththesamenamebutdifferentparameters,enablingcompile-timepolymorphism,whileoverridingoccurswhenasubclassprovidesaspeci

Sep 10, 2025 am 03:36 AM

Optimization and transaction management practice of Sybase stored procedures and unique IDs

This article discusses the problem of duplication when stored procedures generate incremental IDs in Sybase databases, even if the application layer has configured the SERIALIZABLE isolation level. The core reason lies in the non-atomicity of internal operations of stored procedures and the lack of transaction management. The article provides two stored procedure optimization solutions: introducing explicit transactions to ensure atomicity, or implementing more efficient atomic operations through a single UPDATE statement, and emphasizes the importance of database locking mechanisms (such as datarows) to concurrency performance and data integrity, aiming to guide developers to build robust ID generation mechanisms.

Sep 10, 2025 am 03:15 AM

How to get and set field values using reflection in Java

Use getField() to get public fields, getDeclaredField() to get all fields including private fields; 2. Access private fields through setAccessible(true); 3. Call get() and set() methods to read or modify the field values, and pass null into static fields as object parameters; 4. NoSuchFieldException and IllegalAccessException exceptions must be handled; 5. The reflection function is powerful but affects performance and destroys encapsulation, and should be used with caution in scenarios such as frameworks and serialization.

Sep 10, 2025 am 02:17 AM

Jackson handles Double type fields in String/pure numeric format

This article aims to solve the problem that Jackson may encounter when mapping String or purely digital format data to Double type fields during deserialization. By unifying the Jackson dependency version, you can ensure that it can handle both formats correctly, avoiding the NoSuchFieldError: USE_FAST_DOUBLE_PARSER error. This article will explain the root cause of the problem and how to resolve it through version management.

Sep 10, 2025 am 01:30 AM

How do you establish a database connection using JDBC in Java?

LoadtheJDBCdriverusingClass.forName()(optionalinJDBC4.0 ).2.DefinethedatabaseURL,username,andpasswordwithcorrectsyntaxforthespecificdatabase.3.EstablishtheconnectionusingDriverManager.getConnection(url,username,password),whichreturnsaConnectionobject

Sep 10, 2025 am 12:59 AM

jdbc Database Connectivity

How to deserialize an object from a byte stream in Java

To correctly deserialize an object from a byte stream, you must use ObjectInputStream to read data and ensure that the class implements the Serializable interface. The specific steps are as follows: 1. Wrapping the InputStream (such as FileInputStream or ByteArrayInputStream) into an ObjectInputStream; 2. Call the readObject() method to read the object and cast it to the original type; 3. Handle IOException and ClassNotFoundException exceptions; 4. Ensure that the deserialized class implements the Serializable interface and

Sep 10, 2025 am 12:55 AM

Spring Data Elasticsearch: A practical guide to automatically generate entity mappings

This article details how to automatically generate and apply Elasticsearch index mapping based on entity classes (such as the Person class defined by @Document and @Field annotations) in Spring Data Elasticsearch applications. By checking whether the index exists, this approach ensures that the index and its complete field map are created efficiently and accurately at the start of the application, simplifying the development process and reducing manual configuration errors.

Sep 10, 2025 am 12:33 AM

Implementing page redirection in Java Servlet: Avoiding the correct posture of 404 errors

This tutorial explains in detail the correct way to implement page redirection in Java Servlet applications, focusing on solving the problem of HTTP 404 Not Found errors due to improper use of paths. We will compare the usage of RequestDispatcher.forward() with HttpServletResponse.sendRedirect(), emphasizing the importance of using relative paths and request.getContextPath() in web applications, ensuring the stability and portability of page jumps.

Sep 09, 2025 pm 12:51 PM

Kafka Producer Performance Optimization: Achieve Million Message Throughput

This article aims to guide developers on how to optimize Kafka Producer to achieve millions of message throughput per second. By deeply profiling the key configuration parameters of Producer, such as linger.ms, batch.size, compression.type, acks and enable.idempotence, as well as Topic's configuration parameters min.insync.replicas, combined with actual code examples, help readers understand how to balance throughput and data consistency and ultimately achieve optimal performance.

Sep 09, 2025 pm 12:48 PM

Correct management and call of Toast messages in non-Activity classes of Android

This article aims to solve the type mismatch problem encountered when calling Toast messages in Android non-Activity classes. By elaborating on the requirements of the Toast.makeText() method for Context parameters, and providing a solution to correctly pass the Activity Context to static tool methods, centralized management and reuse of Toast messages are realized, thereby improving the robustness and maintainability of the code.

Sep 09, 2025 pm 12:45 PM