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Technical Articles

Java

javaTutorial

Java programming: Implementing text file word letter scoring system

This tutorial explains in detail how to read text files in Java and calculate the total score of each word based on the preset letter scoring rules. The article will point out common programming misunderstandings and provide a clear and efficient solution to achieve word scoring by traversing each character in a word and accumulating its corresponding scores, and ultimately outputting the word and its total score.

Aug 13, 2025 am 09:33 AM

Understanding Java ClassLoaders and Reflection API

ClassLoader is responsible for loading class bytecode. Java provides three-layer class loaders, Bootstrap, Platform (formerly Extension), and Application. It follows the parent delegation model, that is, first delegate the parent loader to try loading, and only load it by itself when the parent cannot complete, ensuring the security of the core class and avoiding duplicate loading; 2. Custom loading can be achieved by inheriting ClassLoader and rewriting findClass(), which is used for hot deployment, plug-in systems and other scenarios; 3. Reflection API allows the runtime to dynamically obtain class structures and operate fields, methods and constructors, such as obtaining classes through Class.forName() and newIns

Aug 13, 2025 am 09:32 AM

Fault-tolerant processing in Java parallel method calls: Ensure independent execution and error logging

This article discusses how to avoid interrupting the entire processing process due to a single task exception when executing parallel method calls in Java. By leveraging CompletableFuture and custom result encapsulation mechanism, even if some parallel tasks fail, other tasks can be ensured to continue execution, and the execution results and exception information of all tasks can be collected uniformly to achieve robust parallel processing.

Aug 13, 2025 am 09:21 AM

Verify exact True and False values using Java Boolean types

This article aims to provide a way to verify that user input is an exact true or false value using the Boolean type in Java. We will explore how to handle null values and how to ensure that only valid boolean values can pass verification while avoiding changing the data type of the input parameters. With sample code and detailed explanations, you will learn how to write robust and reliable Boolean verification logic.

Aug 13, 2025 am 09:18 AM

How to get the operating system name in Java

To get the operating system name in Java, you should use System.getProperty("os.name"); 1. This method returns the operating system name string running by the JVM; 2. Common return values include Windows 10, Linux, MacOSX, etc.; 3. The results can be normalized through toLowerCase() and contains() to adapt to different variants; 4. You can also obtain more system information in combination with os.arch, os.version and other attributes; 5. This method does not require external libraries or special permissions, and is cross-platform and reliable, which is the recommended standard practice.

Aug 13, 2025 am 09:17 AM

How to log details of non-200 HTTP responses

This article describes how to log more detailed information in a standalone log file for non-200 HTTP responses, including request methods, paths, and response status codes. We will explore using Logback configuration to achieve this, ensuring that this additional information is logged only when an error occurs, thus avoiding contaminating regular logs.

Aug 13, 2025 am 09:12 AM

Get DatePicker value from the selected cell of TableView

This article aims to solve the problem in JavaFX how to get date values from the selected row of TableView and set them back to the DatePicker control. There are two methods mainly introduced: one is to define the column type of TableView as LocalDate, and directly obtain the LocalDate object; the other is to parse the obtained string value into a LocalDate object, and then set it to the DatePicker. Through this article, developers can more effectively handle data interactions between TableView and DatePicker.

Aug 13, 2025 am 09:06 AM

Verify True and False values accurately using Java Boolean types

This article aims to provide a method to use the Boolean type in Java to accurately verify whether the input value is true or false. By combining the Optional class, null values can be handled gracefully and ensure that only "true" or "false" strings (ignoring case) can pass verification, avoiding potential problems with other inputs. We will provide sample code and explain in detail how it works and precautions.

Aug 13, 2025 am 08:51 AM

Java Swing: Solve the problem that JButton cannot display images

This article aims to solve the problem that JButton cannot display images correctly in Java Swing programs. By analyzing code structures and resource paths, we provide a reliable solution to ensure that image resources can be loaded correctly and displayed on JButton, thereby improving the user interface experience. This article will provide detailed code examples and precautions to help developers quickly solve similar problems.

Aug 13, 2025 am 08:39 AM

Deploying Java Applications with Ansible and Jenkins

JenkinshandlesCI/CDtaskslikebuildingandtestingJavaapplications,whileAnsiblemanagesdeploymentandconfigurationontargetservers.2.SetupaJenkinspipelineusingaJenkinsfiletoautomatestages:buildwithMaven,runtests,anddeployviaAnsibleplaybookstostagingandprodu

Aug 13, 2025 am 07:54 AM

Tackling the N 1 Problem in Java Persistence Layers

TheN 1probleminJavapersistenceoccurswhenfetchingalistofentitiestriggersadditionalqueriesfortheirassociations,resultingin1queryfortheparentsandNqueriesforthechildren,degradingperformance.1.UseJOINFETCHinJPQLtoloadparentandchildentitiesinasinglequery,i

Aug 13, 2025 am 07:51 AM

java Performance optimization

What is the Factory design pattern in Java?

The factory design pattern is used to create objects without specifying specific classes. The factory method determines which class to instantiate based on input. For example, DocumentFactory returns PdfDocument or WordDocument instances according to the document type, thereby realizing the decoupling of client code from specific implementations, so that when adding new document types, you only need to expand the factory method without modifying client code. This pattern is suitable for scenarios where object types are determined at runtime, need to centrally create logic or system needs to support flexible expansion, and ultimately improve the maintainability, scalability and loose coupling of the code.

Aug 13, 2025 am 07:48 AM

java Design Patterns

Analysis and solution of array out-of-bounds exceptions in Java string character switching operations

This article discusses in-depth the common ArrayIndexOutOfBoundsException array out-of-bounds exceptions when performing string characters in Java. By analyzing the loop conditions and character access logic errors that cause this exception, the article explains in detail how to correctly perform boundary checks, avoid improper incremental operations, and provides an optimization solution based on adjacent character switching. The tutorial covers the causes of exceptions, correct iteration and exchange logic, and provides clear sample code to help developers write more robust and efficient string handlers.

Aug 13, 2025 am 07:39 AM

Use void method to change the state of boolean variables in Java

This article will introduce how to use void methods in Java to change the state of boolean variables and implement the conversion from closed to open. By creating a class containing getters and setters, the values of boolean variables can be effectively managed and modified, thereby controlling the state of the program. This article will provide detailed code examples and explanations to help readers understand and apply this technology.

Aug 13, 2025 am 07:27 AM