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Technical Articles

Java

javaTutorial

How to work with JSON in Java

ToworkwithJSONinJava,useathird-partylibrarylikeJackson,Gson,orJSON-B,asJavalacksbuilt-insupport;2.Fordeserialization,mapJSONtoJavaobjectsusingObjectMapperinJacksonorGson.fromJson;3.Forserialization,convertJavaobjectstoJSONstringsviawriteValueAsString

Aug 14, 2025 pm 03:40 PM

java json

Performance Comparison: Java vs. Go for Backend Services

Gotypicallyoffersbetterruntimeperformancewithhigherthroughputandlowerlatency,especiallyforI/O-heavyservices,duetoitslightweightgoroutinesandefficientscheduler,whileJava,thoughslowertostart,canmatchGoinCPU-boundtasksafterJIToptimization.2.Gouseslessme

Aug 14, 2025 pm 03:32 PM

java go

How to compile and run a Java program?

TocompileandrunaJavaprogram,firstinstalltheJDK,thenwriteaJavafilewithamatchingclassname,compileitusingjavacHelloWorld.java,andrunitwithjavaHelloWorld,ensuringthefilenameandclassnamematchexactlyandtheJDKiscorrectlyaddedtothesystemPATH,resultingintheou

Aug 14, 2025 pm 03:18 PM

java 編譯運行

How to check for a palindrome in Java?

Basic palindrome inspection (case sensitivity) can be achieved by inverting the string and comparing it; 2. The check that ignores upper and lowercase must first convert the string to lowercase and then compare; 3. The check that ignores non-alphanumeric characters must first clean the string, retain the letters and numbers and convert it to lowercase; 4. The double-pointer method compares effective characters from both ends to the middle, which is more efficient and suitable for real scenarios; in summary, selecting methods according to requirements, it is recommended to use the double-pointer method combined with character filtering in actual applications to obtain the best performance and accuracy.

Aug 14, 2025 pm 02:28 PM

Selenium Grid 4: A complete guide to specifying nodes to run test cases

This article aims to guide Selenium Grid 4 beginners on how to configure and use Grid, especially how to specify test cases to run on specific nodes when having multiple nodes with the same browser. By configuring the node's custom abilities and specifying these abilities in the code, you can precisely control the execution location of the tests, so that Grid resources can be better managed and leveraged.

Aug 14, 2025 pm 02:21 PM

Strategies and considerations for security update final ConcurrentHashMap in Java

This article explores how to safely update a ConcurrentHashMap declared final in Java high concurrency environment to avoid data inconsistency or service outages. In response to the problem of instantaneous data missing caused by putAll() after directly using clear(), the article proposes an incremental update strategy, that is, add new entries first and then remove old entries. At the same time, the advantages and disadvantages of this strategy are deeply analyzed, and the thinking direction of advanced solutions is provided for the needs of stricter atomicity or complex update scenarios, emphasizing the key role of requirements analysis in concurrent programming.

Aug 14, 2025 pm 01:00 PM

What is the difference between List and Set in Java?

List allows repeating elements and maintaining the insertion order, supports index access, and is suitable for scenarios where order and repetition are required; Set does not allow duplication, and does not guarantee order (except LinkedHashSet and TreeSet), and has no index access, and is suitable for scenarios where uniqueness and quick searches are required.

Aug 14, 2025 pm 12:38 PM

java gather

What are streams in Java 8?

StreamsinJava8arenotdatastructuresbutafunctionalabstractionforprocessingsequencesofelementsfromsourceslikecollectionsorarraysthroughpipelinesofoperations,enablingdeclarative,SQL-likeprocessingusingmethodssuchasfilter,map,andreduce;theydonotstoredatab

Aug 14, 2025 am 11:00 AM

streams java 8

What is the difference between Comparable and Comparator in Java?

Comparable defines natural sorting, and needs to implement the compareTo method and modify the class itself, which is suitable for default sorting; Comparator provides external custom sorting, which is implemented through the compare method, supports multiple sorting rules without modifying the original class, which is more flexible.

Aug 14, 2025 am 10:58 AM

Check if the sorted subarray exists in a larger sorted array: O(log n) Complexity implementation

This article introduces a method to determine whether a sorted subarray of size k exists in a sorted array of size n within the O(max(log n, k)) time complexity. This method is based on binary search to locate the starting element of the subarray and performs subsequent verification, especially when n is much larger than k.

Aug 14, 2025 am 10:48 AM

Implementing word scoring system in Java: Tutorial on file reading and character points calculation

This tutorial is designed to guide readers how to build a word scoring system in Java, which calculates the total score of each word based on the preset alphabetical number rules by reading text files. The article will explain common programming pitfalls in detail and provide a solution for efficient character point mapping using HashMap while covering best practices for file I/O to ensure code robustness and readability.

Aug 13, 2025 pm 01:15 PM

Non-static methods for calling existing JFrame instances in Java: Avoid repeated creation

This article aims to solve the problem of how to call non-static methods in an existing JFrame instance from another class (such as an event listener) in a Java GUI application without creating a new JFrame object. The core solution is to ensure that the event processing logic can correctly interact and update with the main interface components by passing references to existing JFrame instances, thereby avoiding unnecessary repeated interface creation and improving program efficiency and user experience.

Aug 13, 2025 pm 01:06 PM

What is Maven in Java?

MavenisabuildautomationandprojectmanagementtoolforJavathatusesapom.xmlfiletomanagedependencies,plugins,andbuildconfigurations;1)itautomatesdependencymanagementbydownloadingrequiredlibrarieslikeJacksonfromrepositories;2)enforcesastandardizedprojectstr

Aug 13, 2025 pm 01:01 PM

java maven

Run tests with Selenium Grid 4 specified nodes

This article aims to guide beginners on how to configure nodes in Selenium Grid 4 and run tests precisely on specified nodes. By setting custom capabilities, you can control which node the test cases are executed, thus achieving more granular testing environment management and resource allocation. This article will explain in detail how to add custom capabilities to the node configuration file and use these capabilities in the test code to specify the running node.

Aug 13, 2025 pm 01:00 PM