Article Tags
Article Tags
Find the space between array elements: Java Tutorial
This article aims to introduce how to find and print the interval between adjacent elements in an array using Java. We will provide an efficient and easy-to-understand method that avoids the use of hash collections, and provide complete code examples and detailed explanations to help readers master the skills of dealing with array spacing in Java.
Jan 12, 2026 am 12:54 AM
Strategies for combining and reusing Arbitrary generators in jqwik
This article explores in depth how to effectively combine and reuse Arbitrary generators in jqwik to build test data for complex domain objects. The article introduces in detail the sharing and fine control of Arbitrary through various strategies such as static methods, typed encapsulation, and custom annotations. At the same time, it also covers the techniques of using `@ForAll` in the `@Provide` method and domain context, and provides specific code examples to help developers write more flexible and maintainable property tests.
Jan 12, 2026 am 12:48 AM
How to use Java's Optional to avoid NullPointerException? (Code Guide)
UseOptionalonlyasareturntypetosignalexpectedabsence,notforfields/parametersornullsafety;preferorElse/ifPresent/mapoverget(),avoidOptionalincollections/APIs,andneverwrapnullablevalueslate.
Jan 12, 2026 am 12:32 AM
Caffeine cache value storage failure problem analysis and best practices
This article aims to solve the common problem that the value in the Caffeine cache cannot be retrieved correctly (null is returned) after being stored. Through an in-depth analysis of weakKeys(), weakValues(), and the scope of the cache instance, the article reveals the core reasons for value invalidation and provides a solution to declare the cache as static final and remove the weak reference configuration. The tutorial will explain its principles in detail and give sample code to help developers build a stable and reliable Caffeine cache.
Jan 12, 2026 am 12:15 AM
Detailed explanation of renaming strategy before file upload in Java
In Java file processing, especially in upload scenarios, it is often necessary to rename files before saving them to the target path. This article will introduce in detail how to use the java.nio.file.Files.copy() method to achieve this requirement efficiently and safely, avoiding the traditional complicated operation of saving first and then renaming, ensuring that the file content is directly written to the target location with the specified new name, and providing clear code examples and precautions.
Jan 12, 2026 am 12:03 AM
Using two stacks to implement complexity analysis and optimization of queues
This article takes an in-depth look at how to implement a queue using two stacks, and analyzes the time complexity of its operation in detail. We will reveal why push operations are typically O(1), while pop and peek operations can reach O(N) in the worst case, and clarify that their amortized time complexity is O(1). Additionally, the article will provide code examples and discuss alternatives for achieving strict O(1) operations.
Jan 11, 2026 am 10:48 AM
Optimization and implementation of gene identification algorithms in DNA sequences
This tutorial explores in detail the implementation and optimization of algorithms for identifying genes in DNA sequences. The article first explains the basic biological principles of gene identification, including the core rules that start codons, stop codons, and the length of the coding region must be a multiple of three. Subsequently, by analyzing a Java code example, the article highlighted common errors when dealing with stop codons. If its position does not satisfy the multiple rule of three, the search should continue instead of directly terminating. An iterative optimization solution was provided, aiming to help developers build more accurate and efficient gene search programs.
Jan 11, 2026 am 10:33 AM
Correctly package image resources into the JAR file of IntelliJ IDEA
This article aims to solve the problem that image resources in IntelliJ IDEA projects cannot be displayed normally after being packaged into JAR files. By placing the resource files in the correct directory structure and using ClassLoader to correctly read the resources, ensure that the image resources can be successfully packaged and loaded, thereby solving the image display problem when the JAR file is running.
Jan 11, 2026 am 10:27 AM
Selenium Java: Solve the problem of the page becoming unresponsive or not jumping after clicking the 'Continue' button
In automated testing, it is a common problem that the page fails to navigate to the next step as expected after clicking the "Continue" button, especially in single-page applications (SPA) or scenarios where content is loaded dynamically. This is usually due to the element being visible but not yet fully interactive. This article will introduce in detail how to use Selenium's WebDriverWait and ExpectedConditions.elementToBeClickable to accurately wait for the element to become clickable, thereby ensuring that the click operation can successfully trigger the page logic and navigation.
Jan 11, 2026 am 10:18 AM
Get synchronized BlockingQueue list in Java
This article explains how to create a synchronized list containing multiple BlockingQueue instances in Java. Implementation classes of the BlockingQueue interface such as ArrayBlockingQueue need to specify the initial capacity. The article provides two methods to initialize and synchronize the BlockingQueue list using the Stream API and the traditional for loop, and emphasizes the importance of correctly initializing the BlockingQueue capacity to ensure thread safety.
Jan 11, 2026 am 10:09 AM
Data conversion and copying strategies between custom object lists in Java
This article aims to explain in detail how to copy and convert data from a custom object list (such as List) to another different type of object list (such as List) in Java. The core strategy is to iterate over the source list, create a new instance for each element of the target list, and map the shared field value using a constructor or setter method to ensure data independence and type matching.
Jan 11, 2026 am 10:00 AM
JavaFX and embedded Tomcat server collaborative startup and life cycle management
This article aims to solve the problem of JavaFX desktop application and embedded Tomcat server starting at the same time and working together. By analyzing common errors, such as improper use of Tomcat.getServer().await() and direct calling of the JavaFX start() method, the article will elaborate on how to use JavaFX's Application.launch() mechanism and combine it with its life cycle methods (init(), stop()) to elegantly manage the startup and shutdown of Tomcat, ensuring the smooth operation and integration of the two components.
Jan 11, 2026 am 09:51 AM
MongoDB aggregate query $in parameter binding practice in Spring Data Java
This article takes an in-depth look at how to correctly handle the parameter binding issue of the $in operator in the aggregation pipeline when using the @Aggregation annotation in Spring Data MongoDB. By analyzing a common error example, we explained in detail the correct syntax correction that needs to be taken when Java's List type parameter is used as the array value of the $in operator to ensure that MongoDB can correctly parse and execute the aggregate query.
Jan 11, 2026 am 09:42 AM
How to safely perform numerical aggregation operations on string type fields in Hibernate
When the string field of a Hibernate entity needs to participate in numeric aggregation (such as MAX), HQL does not support direct embedding of CAST or database functions (such as TO_NUMBER) into subqueries, which can easily trigger SQL syntax exceptions (ORA-01722) or HQL parsing errors; it is recommended to use native SQL queries instead and explicitly handle type conversion.
Jan 11, 2026 am 09:36 AM
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