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Technical Articles

Java

javaTutorial

Guide to the correct use of query parameters and request headers in HTTP requests

This article explores in depth the importance of correctly distinguishing and using query parameters from request headers in HTTP requests. An instance of sending weather API requests through Java explains in detail how to place the API key in the request header and how to correctly attach query parameters such as city names to the URL path. The article highlights best practices for following HTTP specifications and API documentation to avoid common "400 Bad Request" errors and recommends using advanced HTTP client libraries to simplify development.

Sep 03, 2025 am 05:57 AM

How to override a method in Java

Method overrides allow subclasses to provide concrete implementations of defined methods in parent class. 1. Use @Override annotation to ensure correct rewrite; 2. The subclass must inherit the parent class or implement the interface; 3. The rewrite method must have the same method name, parameter list, and return type (or covariant return type); 4. The access modifier cannot be stricter (such as public cannot become private); 5. Static, private and final methods cannot be rewritten; 6. The constructor cannot be rewritten, but the parent class constructor can be called through super(); finally polymorphic calls are implemented through object types, such as AnimalmyDog=newDog(); myDog.makeSound(); will output "Ba

Sep 03, 2025 am 05:13 AM

java Method overriding

How to implement multithreading in Java using the Runnable interface

The core of implementing multi-threading is to use the Runnable interface. 1. Create a class to implement Runnable and rewrite the run() method to define the task logic; 2. Pass the Runnable instance to the Thread object; 3. Call the Thread start() method to start the thread, so that the task can be executed concurrently. This method avoids the limitation of inheriting the Thread class, supports lambda expressions to simplify the code, and can integrate well with the thread pool. It is a recommended multi-thread implementation method in Java.

Sep 03, 2025 am 04:52 AM

A deep understanding of Maven dependencyManagement and dependency version management

Maven's dependencyManagement tag is used to centrally manage the version and scope of project dependencies to achieve version uniformity. When the same dependency declares the version in both dependencies and dependencyManagement, the explicitly specified version in dependencies will work better. Its core value lies in the fact that in a multi-module project, the parent POM declares the version uniformly, and the version number can be omitted when referencing the child module, thereby ensuring the consistency of the project-dependent version.

Sep 03, 2025 am 04:21 AM

How to serialize objects in Java

To correctly serialize Java objects, you must first make the class implement the Serializable interface, then use ObjectOutputStream to serialize the object to the file, then deserialize and restore the object through ObjectInputStream, process the transient field to exclude sensitive data, and you can customize the writeObject and readObject methods to control the serialization process. It is recommended to explicitly declare serialVersionUID to ensure version compatibility, and you need to pay attention to the fact that static fields are not serialized, deserialized, and do not call constructors, and security risks.

Sep 03, 2025 am 04:18 AM

Convert ZULU timestamp to Europe/Paris time zone time in Java

This article describes how to convert ZULU timestamps (UTC time) to Europe/Paris time zone time zone using the java.time API introduced in Java 8 and later, and properly handle daylight saving time (DST). The focus is to use OffsetDateTime and ZonedDateTime classes to avoid the use of outdated java.util.Date and SimpleDateFormat. With sample code, it shows how to convert between different time zones and ensure the correct application of DST.

Sep 03, 2025 am 02:54 AM

How to use synchronized blocks vs synchronized methods in Java

When using the synchronized method, the entire method body is locked, which is suitable for situations where all the code of the method needs to be synchronized and simplicity is pursued; 2. When using the synchronized block, only the key code segment is locked, and private lock objects can be specified to improve concurrency performance and avoid external interference; 3. Prioritize synchronized blocks to achieve finer granular control and higher performance, especially when only some codes need to be synchronized; 4. Avoid locking this or public variable objects, and it is recommended to use private final objects as locks; 5. Keep the synchronized code blocks as small as possible to improve concurrency.

Sep 03, 2025 am 01:53 AM

Java programming tutorial: Using For loop to realize multi-employee salary calculation and overtime pay processing

This tutorial provides detailed instructions on how to build a program in Java to calculate the salary of multiple employees, including logical processing of overtime pay. We will focus on how to use the for loop to efficiently iterate the data of each employee, and how to use System.out.printf() to make clear formatted output to ensure that the program is structured reasonably and easily scalable.

Sep 03, 2025 am 12:42 AM

Unexpected behavior of object arrays in Java: In-depth understanding of reference passing

This article aims to explain the common problem of modifying array elements in Java when objects contain arrays. By analyzing the sample code, we will explore the reference passing mechanism of Java in depth, and provide solutions to help readers understand how to avoid sharing array references, thereby achieving independent modification of arrays inside objects. The article will explain how to use the Arrays.copyOf() method to create a copy of an array to ensure data isolation between objects.

Sep 03, 2025 am 12:36 AM

Principles and Practice of Race Conditions in Multithreading of Java

This article explores the Race Condition in Java multithreaded programming in depth, and introduces and demonstrates in detail how to deliberately create race conditions by sharing variable states and non-atomic operations by analyzing a summation example that fails to produce race conditions. The article provides specific Java code examples that explain the reasons for race conditions, their manifestations in output, and emphasizes the need to identify and avoid such problems in concurrent programming.

Sep 02, 2025 pm 12:51 PM

Optimize AWS SES email sending speed with Spring Boot

This article aims to resolve the slow mail sending using AWS SES in Spring Boot applications. By comparing the performance differences between Python code and Spring Boot code, we analyze possible causes and provide solutions to optimize email sending speed using AWS Java SDK V2 version, and recommending official documentation and code bases for best practices.

Sep 02, 2025 pm 12:45 PM

Deeply understand the isolation of reference passing of arrays in Java and internal data of objects

This article aims to explore in-depth the unexpected behavior that may occur when objects interact with arrays in Java, especially when arrays are passed as constructor parameters. We will explain the nature of Java "value transfer" and explain how reference type variables (such as arrays) lead to aliases during the transfer process, which in turn causes coupling between the internal state of the object and the external variables. With specific code examples, we will demonstrate how to use defensive copying technology to effectively isolate internal data in objects, ensure its encapsulation and independence, thereby avoiding unnecessary side effects.

Sep 02, 2025 pm 12:42 PM

Tutorial on dynamically updating XML tag content using XSLT in Java

This tutorial details how to efficiently and flexibly update the values ??of specific tags in XML documents in Java applications through XSLT (Extensible Stylesheet Language Transformations) technology. We will explore the design of XSLT style sheets, including parameter passing and template matching, and provide complete Java code examples to demonstrate how to call the XSLT processor and pass in runtime data to implement customized modification of XML content.

Sep 02, 2025 pm 12:36 PM

Database synchronization and concurrent processing in Java multi-threaded environment: efficiently process massive data

This article aims to provide a practical guide on database synchronization and concurrent processing in a Java multithreaded environment. For the scenario of million-level data volume, we will explore how to use thread pools, database connection pools, and the database's own transaction and lock mechanisms to achieve efficient data processing, avoid concurrent conflicts, and ensure data consistency. Focus on building robust and high-performance solutions in conjunction with ExecutorService, HikariCP, and transaction-enabled databases such as MariaDB's InnoDB.

Sep 02, 2025 pm 12:30 PM