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Technical Articles

Java

How to work with BigDecimal for precise calculations in Java

To use BigDecimal to perform decimal operations accurately, you must use a string constructor, specify a rounding mode, and compare with compareTo; 1. Create an object with newBigDecimal("0.1") or BigDecimal.valueOf(0.1); 2. Call divide(a,b,4, RoundingMode.HALF_UP) and other explicitly specify the accuracy and rounding mode when performing division; 3. Use setScale(2, RoundingMode.HALF_UP) to control the number of decimal places; 4. Use compareTo() to determine the equality of the values instead of equals(); 5. Avoid

Aug 12, 2025 am 04:26 AM

Creating Custom Annotations in Java for Metaprogramming

Define custom annotations using the @interface keyword, which can contain member variables such as value, assignedTo and priority, and control their behavior and life cycle through meta annotations such as @Target, @Retention, @Documented, @Inherited and @Repeatable; 2. When using @Repeatable, you need to define container annotation such as TodoList to support reuse; 3. Process annotations at runtime through reflection, use getAnnotationsByType method to obtain annotation information and execute corresponding logic; 4. Implement the annotation of AbstractProcessor at compile time

Aug 12, 2025 am 03:16 AM

How to create a REST controller in Java with Spring Boot

Use SpringInitializr to create a project and add SpringWeb dependencies; 2. Create a User model class to define the data structure; 3. Use @RestController and @RequestMapping to create a controller containing @GetMapping, @PostMapping, @PutMapping, @DeleteMapping methods; 4. Run the application and test the API endpoints through curl or Postman. SpringBoot automatically handles JSON serialization and request routing, thereby quickly building a fully functional REST controller.

Aug 12, 2025 am 03:14 AM

What are the main principles of object-oriented programming in Java?

Thefourmainprinciplesofobject-orientedprogramminginJavaareencapsulation,inheritance,polymorphism,andabstraction.Encapsulationbundlesdataandmethodswithinaclassandrestrictsdirectaccesstointernaldetailsusingaccessmodifiers,ensuringdataintegrity—forexamp

Aug 12, 2025 am 02:51 AM

java Object-Oriented Programming

How to use the StringBuilder class in Java

Use StringBuilder to efficiently process variable strings. 1. Creation methods include: empty construction, with initial string or specified capacity; 2. Common operations include: append() append, insert() insert() insert, replace() replacement, delete() delete() deletion, reverse() inversion and setLength() setting length; 3. After the modification is completed, you need to call toString() to convert to String; 4. Better than String splicing in single thread to avoid a large number of temporary objects; 5. Non-thread safe, StringBuffer should be used in multi-thread scenarios. Therefore, when frequently modifying strings, you should give priority to using StringBuilder to improve

Aug 12, 2025 am 02:40 AM

Securing Java Web Applications: Best Practices

UseframeworkslikeSpringSecurityforrobustauthenticationandauthorization,enforcestrongpasswordpolicieswithbcrypt,applyRBAC,andmanagesessionssecurely.2.DefendagainstOWASPTop10threats:preventXSSwithoutputencodingandCSPheaders,blockCSRFwithtokens,avoidSQL

Aug 12, 2025 am 01:19 AM

How to check if a vowel is present in a string in Java

Convertthestringtolowercasetoensurecase-insensitivecomparison.2.Loopthrougheachcharacterandcheckifitmatchesanyofthevowels'a','e','i','o',or'u'.3.Returntrueassoonasavowelisfound;otherwise,returnfalseaftertheloop.4.Handlenulloremptystringsbyreturningfa

Aug 12, 2025 am 01:06 AM

java string

What is dependency injection in Java?

DependencyinjectioninJavaenablesloosecouplingbyinjectingdependenciesinsteadofhardcodingthem.1.Intraditionalcode,classescreatetheirowndependencies,leadingtotightcoupling;2.WithDI,dependenciesareprovidedexternallyviaconstructor,setter,orfieldinjection;

Aug 12, 2025 am 01:05 AM

java dependency injection

Spring Boot How to get all beans in XML configuration files

This article describes how to read an XML configuration file in a Spring Boot application and get all the specific types of beans defined therein. The getBeansOfType() method provided by ApplicationContext can easily obtain instances of all beans and convert them into collections for subsequent operations. It avoids the tedious process of manually obtaining beans one by one, and improves the maintainability and efficiency of the code.

Aug 11, 2025 pm 11:24 PM

Deeply understand the memory allocation mechanism of Java object methods

This article deeply explores the mechanism of memory allocation of object methods in Java. A common misconception is clarified: method code does not allocate memory for each object separately. In fact, the method code is only loaded once when the class is loaded and stored in the method area (or metaspace) for sharing all instances of the class. The object memory allocated on the heap is mainly used to store instance fields and object headers. The reference type only affects the accessibility at compile time and does not change the actual memory layout of the object.

Aug 11, 2025 pm 10:24 PM

Java extracts substrings between the beginning and end vowels in a string

This article describes how to use Java to extract substrings from the first vowel to the last vowel in a string. We will explore the concise method of using regular expressions, as well as the optimization solution of traditional loop traversal methods, and provide code examples and considerations to help developers solve such string processing problems efficiently.

Aug 11, 2025 pm 10:15 PM

How to implement a thread-safe singleton in Java?

Double-CheckedLockingensuresthread-safelazyinitializationwithminimalperformancecostusingvolatileandsynchronizedblocks.2.StaticInnerClass(BillPugh)isthread-safe,lazilyloaded,andefficientwithoutexplicitsynchronization.3.EagerInitializationcreatestheins

Aug 11, 2025 pm 09:39 PM

How to find the length of a string in Java

TofindthelengthofastringinJava,usethelength()method.1.Callthelength()methodonastringobjectusingparentheses,asitisamethodandnotaproperty.2.Themethodreturnsanintegerrepresentingthetotalnumberofcharacters,includingletters,digits,spaces,andsymbols.3.Anem

Aug 11, 2025 pm 09:38 PM

Report an error at startup: Groomingly presents error messages to users

When Spring Boot application starts, the lengthy exception stack information is difficult to understand. This article introduces how to provide users with clear error prompts through pop-ups and other means when the Spring Boot application fails to start, so as to avoid users being confused. It also provides sample code to demonstrate how to implement this function, making error information easier to understand and troubleshoot.

Aug 11, 2025 pm 09:36 PM