Article Tags
Article Tags
Recursively solving the longest palindromic substring: a common pitfall and correction solution
This article takes an in-depth look at the algorithm implementation for finding the longest palindromic substring in a string using a recursive method. In response to a common recursive logic error, which is the failure to correctly determine whether an internal substring constitutes a complete palindrome, resulting in inaccurate results, the article provides a detailed analysis, revised recursive logic and sample code, aiming to help developers understand and avoid such pitfalls and achieve efficient and accurate palindrome substring searches.
Dec 02, 2025 am 01:45 AM
How to use MessageDigest for hashing in Java?
Using MessageDigest for hashing requires three steps: obtain the instance MessageDigest.getInstance("SHA-256"), update the data md.update(input), generate the hash md.digest() and convert it to a hexadecimal string. SHA-256 is recommended, avoid MD5 and SHA-1.
Dec 02, 2025 am 01:45 AM
Correct management and implementation of linked list object references in Java
In Java, trying to reassign an object reference directly via the this keyword is not allowed. When implementing a data structure such as a linked list, the correct approach is to introduce an auxiliary "Node" class to encapsulate the data and a reference to the next element. The main linked list class is responsible for maintaining the head and tail nodes of the linked list, and adding and deleting elements by operating the internal references of these nodes, rather than directly modifying the references of the linked list object itself.
Dec 02, 2025 am 01:39 AM
What are the different types of garbage collectors in Java?
The answer is to choose the appropriate garbage collector based on the application requirements: choose Serial for small applications, Parallel for throughput-focused applications, and G1, ZGC or Shenandoah for low-latency large heap memory.
Dec 02, 2025 am 01:30 AM
How to use the Semaphore class for resource limiting in Java?
The Semaphore class limits the number of threads that concurrently access resources through the licensing mechanism; 2. Specify the number of licenses during initialization, acquire() to obtain the license, and release() to release the license; 3. In the example, Semaphore(3) is used to limit up to 3 threads to access database resources at the same time.
Dec 02, 2025 am 01:12 AM
How to use the final keyword with methods and classes in Java?
ThefinalkeywordinJavaisusedtoimposerestrictionsonclasses,methods,andvariables.Whenappliedtomethodsandclasses,itcontrolsinheritanceandmethodoverridingbehavior.Here'showtousefinalwithmethodsandclasseseffectively.Final
Dec 02, 2025 am 12:56 AM
How to read environment variables in Java?
UseSystem.getenv("VAR")toreadaspecificenvironmentvariable,whichreturnsitsvalueasastringornullifunset;forallvariables,useSystem.getenv()togetamapofkey-valuepairs;alwayshandlenullswithdefaultstoavoiderrors.
Dec 02, 2025 am 12:46 AM
How to find the minimum value using Scanner in a loop
This article aims to guide readers on how to use Java's Scanner class in a loop to find the minimum value in a series of numbers entered by the user. The article will analyze common errors and provide corrected code examples to ensure that the program can correctly identify and output the minimum value, while allowing the user to end the program by entering 0.
Dec 02, 2025 am 12:39 AM
Complete guide to disabling DEBUG log output in JBoss/Log4j2 environment
This article details how to disable the DEBUG level log output of Log4j2 in the JBoss application server through the CLI, management console or directly modifying the standalone.xml configuration file. For scenarios where JBoss integrates Log4j2, the tutorial provides a variety of configuration methods, and specifically points out the difference between Hibernate's show_sql configuration and log level control, aiming to help developers effectively manage and control application log information and avoid console output of excessive redundant content.
Dec 02, 2025 am 12:30 AM
Java Audio Looping Guide: Using javax.sound.sampled
This article details the correct way to implement audio loop playback in Java, abandoning the deprecated sun.audio internal API in favor of the standard and powerful javax.sound.sampled package. The tutorial covers the basic infinite loop playback implementation, and how to manage audio playback in a separate thread to ensure that the background music continues to play even if the main thread ends, and provides complete code examples and considerations.
Dec 01, 2025 pm 01:48 PM
Overriding the equals method in Java: Avoiding hidden pitfalls in collection operations
In Java development, correctly overriding the equals method is crucial for customizing the behavior of objects, especially when interacting with collection classes such as LinkedList. This article will delve into how improper equals implementation can lead to unexpected errors in collection operations such as remove, such as removing the wrong object or causing data inconsistency. We will provide examples of correct equals overriding and emphasize its impact on collection behavior. We will also discuss the necessity of hashCode and best practices for using Random objects to ensure the robustness and correctness of the code.
Dec 01, 2025 pm 01:45 PM
Java 8 Stream API: Efficiently construct maps with null-valued keys and update associated objects
This article takes an in-depth look at strategies for building Maps using the Stream API in Java 8, with a particular focus on how to handle keys that may have null values and use this map to efficiently update the associated details of the Product object. The article provides detailed Stream pipeline construction methods, usage of Collectors.toMap(), and best practices for updating objects and managing null values in mapping, aiming to provide a professional and practical tutorial.
Dec 01, 2025 pm 01:42 PM
Transfer mechanism and modification strategy of array parameters in Java methods
In Java, when objects (including arrays) are used as method parameters, the "value passing" mechanism is used, that is, a copy of the object reference is passed. This means that there is no way inside a method to change the original reference held by the caller by reassigning parameters. However, the method can modify the element contents of the array through this reference, or "replace" the original array by returning a new array and reassigning it by the caller.
Dec 01, 2025 pm 01:39 PM
Mutiny asynchronous stream processing: efficient concurrent processing of elements in Uni
This article takes a deep dive into how to process each element in a Uni asynchronously in the Mutiny framework. By converting Uni to Multi stream and using the onItem().transformToUniAndMerge() operator, concurrent and asynchronous processing of elements in the list can be achieved. The article provides two main solutions: combining Vert.x Unit for non-blocking testing, and using collect().asList().await().indefinitely() for blocking result collection, and highlights relevant considerations and best practices.
Dec 01, 2025 pm 01:18 PM
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