Article Tags
Article Tags
Object reference management and linked list data structure implementation in Java
This article aims to address the common misunderstanding in Java of trying to change the reference of the object itself, especially when implementing data structures such as linked lists. This article will delve into the Java reference passing mechanism, explain why this reference cannot be reassigned, and provide a standard and recommended solution: indirectly manage the element links in the data structure by introducing the internal node (Node) class, thereby achieving operations such as adding and deleting linked lists, ensuring the correctness and maintainability of the data structure logic.
Dec 31, 2025 am 05:33 AM
How to create a singleton class in Java? (Full Example)
The Java singleton pattern is implemented through private constructors, static instance fields and public static get methods; it is recommended to use enumerations because of their natural thread safety, serialization safety and simplicity.
Dec 31, 2025 am 05:18 AM
How to read a properties file in Java? (Code Example)
Java needs to use the Properties class to cooperate with InputStream to read the properties file. It supports two methods: class path (getResourceAsStream) and file system path (Files.newInputStream). It needs to handle exceptions, close the stream, and can set default values and type conversions.
Dec 31, 2025 am 05:15 AM
In-depth understanding of CSRF protection and POST request authentication exceptions in Spring Security
This article deeply explores the problem that POST requests may encounter InsufficientAuthenticationException in the integrated environment of Spring Security and JWT. This exception usually originates from Spring Security's cross-site request forgery (CSRF) protection mechanism, which requires submission of a CSRF token for HTTP methods that modify state (such as POST, PUT, DELETE). The article will explain how CSRF works, why GET requests are not affected, and provide guidance on how to correctly handle such authentication exceptions without disabling CSRF.
Dec 31, 2025 am 04:45 AM
JFrame size setting and pack() method: ensure that the window content area meets expectations
This tutorial aims to solve the problem that the actual display size of JFrame in Java Swing is smaller than setPreferredSize(). The core is that the size of JFrame includes decorative elements such as window borders and title bars. The correct approach is to apply setPreferredSize() to the JFrame's content panel (such as JPanel) and then call the JFrame.pack() method to ensure that the content area reaches the expected size.
Dec 31, 2025 am 04:39 AM
How to read environment variables in Java? (System.getenv() Guide)
Java should use System.getenv() to read environment variables. Use System.getenv("NAME") for a single variable to return String or null; use System.getenv() for all variables to obtain a read-only Map; the variable is only visible when the JVM is started, and subsequent OS changes are invalid.
Dec 31, 2025 am 04:33 AM
How to connect to a MySQL database with Java? (JDBC Example)
To connect to the MySQL database, you need to add the MySQLConnector/J driver, use JDBCURL (such as jdbc:mysql://localhost:3306/myapp?useSSL=false&serverTimezone=UTC), call DriverManager.getConnection(), and ensure that the MySQL service is running, the permissions are correct, and the port is open.
Dec 31, 2025 am 04:18 AM
Spring Batch successful job historical data cleaning strategies and practices
This article explores how to effectively manage and clean up successful job history data in Spring Batch applications to optimize database performance and storage space. Since the Spring Batch framework itself does not provide out-of-the-box cleaning functions, the article details two mainstream methods by creating a custom Spring Batch job (Tasklet) or directly executing SQL scripts, and provides implementation ideas and key considerations, aiming to help developers build a robust and efficient data retention strategy.
Dec 31, 2025 am 04:06 AM
Kotlin constant declaration strategy: in-depth analysis and best practices
This article takes an in-depth look at various strategies for declaring constants in Kotlin, including top-level constants, companion object constants, class instance properties and their optimization solutions, as well as advanced usage such as enumerations and collections. The article analyzes in detail the memory efficiency, scope, inheritability and rewriteability of each method, aiming to help developers choose the most appropriate constant declaration method according to specific scenarios and optimize code structure and performance.
Dec 31, 2025 am 03:42 AM
How to mock static methods with Mockito in Java? (Unit Testing)
Mockito3.4.0 supports static method mocking. You need to use mockito-inline dependency and call mockStatic(); the scope must be managed through try-with-resources, and when/verify/reset is supported; priority should be given to refactoring into injectable services rather than abusing static mocks.
Dec 31, 2025 am 03:21 AM
In-depth analysis of shared accounts and anonymous authentication strategies in Firebase applications
This article takes an in-depth look at the choice of user authentication strategies in Firebase applications, paying particular attention to the proliferation of user IDs for anonymous authentication and the feasibility and potential risks of sharing a single email/password account. The article analyzes the impact of shared accounts on security, user management, and Firebase API rate limits, and gives specific suggestions for application scenarios without user data. It also emphasizes enabling the automatic cleanup mechanism of anonymous accounts as a better solution.
Dec 31, 2025 am 03:09 AM
Tips for finding the best value of ArrayList elements in Java object-oriented design
This tutorial details how to efficiently and accurately find the minimum and maximum values of custom objects from an ArrayList in Java object-oriented programming. The article will analyze common programming misunderstandings and provide correct implementation methods for comparison based on specific numerical attributes, including loop conditions, initial value processing and comparison logic, to ensure that developers can correctly implement the maximum value search function for custom collections.
Dec 31, 2025 am 03:00 AM
Java Battleship Game: Implementation Method of Efficiently Randomly Placing Ships without Duplicate Positions
This tutorial details how to place a specified number of ships randomly and without duplication in Java for the Battleships game. Uniqueness of ship positions is ensured by maintaining a pool of available positions and randomly drawing from them, while filling areas where no ships are placed with a default value of 0. The article provides clear implementation ideas, steps and complete Java code examples to help developers build a stable game board layout.
Dec 31, 2025 am 02:36 AM
hasNext() method in Java Scanner: understanding its behavior and avoiding infinite loops
This article takes an in-depth look at the hasNext() method of the Java Scanner class and explains why it causes an infinite loop when input is not consumed. By comparing the different applications of hasNext() in for loops and while loops, we emphasize the importance of consuming input in a timely manner and provide programming practices to avoid such common pitfalls.
Dec 31, 2025 am 02:27 AM
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