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Technical Articles

Java

javaTutorial

How to log messages with Log4j or SLF4J in Java

It is recommended to use SLF4J combined with Log4j2 for Java logging. 1. Add slf4j-api and log4j-slf4j2-impl dependencies; 2. Configure the log4j2.xml file to define the log format and level; 3. Get the SLF4JLogger instance through LoggerFactory.getLogger in the code and record the logs with parameterized messages; 4. Follow the log-level usage specifications, avoid recording sensitive information, and configure log rotation in the production environment, thereby achieving an efficient, flexible and maintainable log system.

Aug 23, 2025 am 05:57 AM

How to use a finally block in Java

Useafinallyblocktoensurecleanupcoderunsregardlessofexceptionsorearlyreturns.2.Thefinallyblockexecutesaftertryandcatchblocks,evenifanexceptionoccursorareturnstatementisencountered.3.Avoidreturn,break,orthrowinfinallytopreventmaskingexceptions.4.Prefer

Aug 23, 2025 am 04:41 AM

how to handle date and time in java 8

Handling dates and times in Java 8 is simpler and more intuitive. The answer is to use the class in the new java.time package: use LocalDateTime to represent dates without time zones, LocalDate and LocalTime to process only dates or time-only scenarios respectively, ZonedDateTime is used for date-time operations containing time zones, Instant is used for machine-readable timestamps, execute date arithmetic through plus and minus methods, use isBefore, isAfter and isEqual for comparison, use thread-safe DateTimeFormatter for formatting and parsing, and try to avoid using old ones

Aug 23, 2025 am 04:10 AM

date time java 8

How to implement menu loop return in Java

This article will introduce how to implement the loop return function of menus in Java programs, so that the program can automatically return to the main menu after completing a task, rather than exiting directly. We will use an example of a planetary list manager to demonstrate how to use a while loop to keep the menu running continuously, and provide code examples and notes to help you understand and apply this technique.

Aug 23, 2025 am 02:21 AM

What are atomic variables in Java?

AtomicvariablesinJavaprovidelock-free,thread-safeoperationsonsinglevariablesusingCPU-levelatomicinstructionslikecompare-and-swap(CAS),eliminatingtheneedforexplicitsynchronization;theyensureatomicity,visibility,andhighperformanceinlow-tomoderate-conte

Aug 23, 2025 am 02:03 AM

java Atomic variables

what is an annotation in java

Javaannotationsaremetadatathatprovideinformationaboutcodewithoutalteringitslogic,servingpurposessuchascompilerinstructions,runtimeprocessing,codegeneration,andconfiguration.1.Theycaninstructcompilers(e.g.,@Overrideensurescorrectmethodoverriding,@Depr

Aug 23, 2025 am 01:12 AM

java

How to remove leading and trailing spaces from a string in Java

Usethetrim()methodtoremoveleadingandtrailingwhitespaceinallJavaversions,whichremovesspaces,tabs,andnewlinesbutdoesnotmodifytheoriginalstring;2.ForJava11andlater,preferstrip()forbetterUnicodewhitespacehandling,stripLeading()toremoveonlyleadingwhitespa

Aug 22, 2025 pm 02:17 PM

Use different versions of AspectJ runtime to handle compatibility issues with compile-time weaving code

This article aims to address compatibility issues with external libraries weaved in compile time by lower versions of AspectJ when using Java 17 and later. By analyzing the version compatibility of AspectJ and combining it with actual cases, this article recommends using the latest version of AspectJ runtime, and provides the basis and precautions for version selection to ensure that the program can correctly load and execute the code weaved at compile time at runtime.

Aug 22, 2025 pm 01:51 PM

Detailed explanation of the differences between Math.pow() and multiplication operations and operator priority in Java

This article aims to deeply analyze the differences between the Math.pow() function and direct multiplication operation in Java in terms of calculation results, as well as the key role of operator priority in the evaluation process of expressions. Through specific examples, Java's operator priority rules are explained in detail, and why different orders of operations lead to different results. Mastering these knowledge points can help write more accurate and predictable Java code.

Aug 22, 2025 pm 01:48 PM

What are the standard ways to compare objects in Java?

In Java, the correct way of object comparison depends on the definition of "equality". 1. Use == to determine whether the reference points to the same memory object, which is suitable for reference equality or basic type value comparison; 2. Rewrite the equals() method to achieve equal content, and follow reflexive, symmetry, pass-through, consistency and non-null rules, and ensure logical equality in custom classes; 3. Rewrite hashCode() to ensure that equal objects have the same hash value to avoid problems in collections such as HashMap; 4. Implement the Comparable interface to define natural sorting, or use Comparator to achieve flexible external sorting; 5. For cases where arrays or nested objects are included, use Arrays.equals(

Aug 22, 2025 pm 01:47 PM

java object Object comparison

Doctor-Efficient Data Model and Safety Practice of Patient Relationship in Spring Boot

This article explores data models and security integration solutions for building complex user relationships (such as doctors and patients) in Spring Boot applications. By adopting a hybrid mode of shared user base classes and specific role entities, we can clearly separate common user attributes and role-specific data, effectively manage many-to-many relationships, and achieve flexible permission control based on user roles, while avoiding data redundancy and null values, providing a robust and scalable solution.

Aug 22, 2025 pm 01:45 PM

Java arrays and user input: iteration, boundary management and robustness practices

This article aims to solve the common array out-of-bounds exceptions (IndexOutOfBoundsException) problem when processing user input in Java programs. By analyzing improper loop logic and array indexing operations, we will show how to design a robust iterative process to ensure that data is collected correctly within the limited array capacity and to properly handle user input to avoid program crashes due to index errors or irregular inputs.

Aug 22, 2025 pm 01:39 PM

Visibility management and solutions for external dependencies in Gradle multi-project construction

This article aims to solve the problem that subprojects cannot recognize external dependencies introduced by their dependent modules in Gradle multi-projects. By deeply analyzing the differences between Gradle implementation and API dependency configuration, the article provides two core solutions: one is to adjust the internal dependency configuration of the core module from implementation to API to expose it to consumers, and the other is to directly redeclare the required external dependencies in the consumer module. The article elaborates on the applicable scenarios, advantages and disadvantages of each method, and is supplemented by code examples, aiming to help developers optimize Gradle dependency management and ensure smooth construction of multi-module project.

Aug 22, 2025 pm 01:33 PM

Spring Boot MockMvc Test: How to pass JSON request body object

This article explains in detail how to effectively pass a JSON-format request body object to POST or PUT requests when using MockMvc for REST API testing in Spring Boot applications. For scenarios where the interface expects to receive @RequestBody parameters, the tutorial introduces the complete steps of using Jackson ObjectMapper to serialize Java objects into JSON strings and sending them as request bodies through the contentType and content methods of MockMvcRequestBuilders to ensure that the test can accurately simulate client behavior and verify controller logic.

Aug 22, 2025 pm 01:24 PM