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Technical Articles

Java

javaTutorial

what is the string pool in java

ThestringpoolinJavaisamemoryoptimizationmechanismthatstoresstringliteralstoreduceduplicationandimproveperformance;whenastringliteraliscreated,theJVMchecksthepoolandreusesexistingreferencesifthevaluealreadyexists,ensuringmemoryefficiencyandfastercompa

Aug 26, 2025 am 05:47 AM

java 字符串池

Java merge sorting: Fixed the problem of incomplete sorting

This article aims to solve the problem of sorting only some elements when using the merge sorting algorithm in Java. By analyzing the error code, find out the root cause of the problem lies in the wrong use of ArrayList and provide the correct code implementation. At the same time, it emphasizes the importance of interface-oriented programming and improves the maintainability and scalability of the code.

Aug 26, 2025 am 05:42 AM

How to remove spaces from a string in Java

Toremoveallspaces(includingbetweenwords),usestr.replace("","")whicheliminateseveryspacecharacter.2.Toremoveallwhitespace(spaces,tabs,newlines),usestr.replaceAll("\\\\s ","")tomatchandremoveallwhitespacecharacte

Aug 26, 2025 am 05:13 AM

What is the difference between a static variable and an instance variable in Java?

Astaticvariablebelongstotheclassandissharedacrossallinstances,whileaninstancevariablebelongstoeachobjectindividually;staticvariablesareinitializedwhentheclassisloadedandaccessedviatheclassname,whereasinstancevariablesarecreateduponobjectinstantiation

Aug 26, 2025 am 04:07 AM

What is BigDecimal in Java?

BigDecimalisusedforprecisedecimalarithmeticinJava,avoidingfloating-pointerrors;itensuresaccuracyinfinancialcalculationsbyprovidingarbitraryprecisionandcontrolledrounding.1.Itpreventsprecisionlossseenindoubleorfloattypes.2.Itallowsexplicitcontroloverr

Aug 26, 2025 am 03:45 AM

How to use a HashSet in Java

AHashSetinJavastoresuniqueelementswithnoorderandprovidesfastO(1)add,remove,andcontainsoperationsusingahashtable;2.Importjava.util.HashSetandcreateaninstancelikeHashSetnames=newHashSet();3.Addelementsusingadd(),whichreturnstrueifaddedandfalseifduplica

Aug 26, 2025 am 03:22 AM

How to use JDBC in Java

First, make sure that the correct JDBC driver is added and configured to the classpath; 2. Use the DriverManager.getConnection() method to establish a connection through the database URL, user name and password; 3. Use the Statement to execute static SQL query or PreparedStatement to execute dynamic query with parameters to prevent SQL injection; 4. For insertion, update, and delete operations, use the PreparedStatement's executeUpdate() method and handle the number of rows that are affected; 5. Always use the try-with-resources statement to automatically close the Connection and Statement

Aug 26, 2025 am 02:44 AM

java jdbc

A Guide to Java Cryptography Architecture (JCA)

JCAisthefoundationforsecurityinJavaapplications,providingaflexible,provider-basedframeworkforcryptographicoperations.1.Itsupportsalgorithmindependence,extensibility,andinteroperabilitythroughpluggableproviderslikeSunJCE,BouncyCastle,andothers,whichca

Aug 26, 2025 am 01:52 AM

java Cryptography

How do you sort an array in Java?

TosortanarrayinJava,useArrays.sort():forprimitivearrayslikeint[],itsortsinascendingorderusingdual-pivotquicksortandmodifiestheoriginalarray;forobjectarrayslikeString[]orInteger[],itusesastablemergesortandallowssortingwithaComparatorforcustomordescend

Aug 26, 2025 am 01:20 AM

JavaFX JAR Packaging: Tutorial to Ensure FXML Resources Loading Correctly

This article aims to solve the common problem that resource files such as FXML cannot load correctly after JavaFX applications are packaged as JAR files. By explaining in detail how to configure IntelliJ IDEA's JAR packaging artifacts, ensure that the resource file is included in the final JAR, and guides how to correctly adjust the loading path of the FXML file, so as to ensure that the application can run stably in an independent JAR environment.

Aug 26, 2025 am 12:18 AM

Methods to access DynamoDB using the Spring JdbcTemplate class

This article will explore how to leverage the JdbcTemplate class in the Spring ecosystem and how to apply its concept to the NoSQL database DynamoDB. Although JdbcTemplate is not designed directly for DynamoDB, we can draw on its design ideas and achieve similar data access and streaming functions through other tools and libraries provided by Spring. This article will introduce how to build a DynamoDB-based data access layer and provide corresponding code examples and considerations.

Aug 25, 2025 pm 01:36 PM

Responsive processing of Flink aggregated data in Spring Boot applications

This article explores the issue of integrating Flink in Spring Boot applications and handling the results of Flink unbounded data source aggregation. For scenarios where Flink aggregation results cannot be returned directly in API responses, solutions are provided to convert unbounded data sources into bounded data sources, and specific implementation methods for data sources such as Kafka are discussed to achieve on-demand acquisition of aggregation results.

Aug 25, 2025 pm 01:24 PM

Vaadin Grid column configuration: Avoid 'multiple columns of the same attribute' exception

This article aims to resolve the common "Multiple columns for the same property" exception in Vaadin Grid. This problem usually stems from the misuse of Grid initialization method and column addition method. When using the new Grid(Entity.class) constructor, Vaadin Grid will automatically create columns for all public properties of the entity class; if the column with the same name is then explicitly added through grid.addColumns("propertyName"), it will cause duplicate definitions, thereby throwing an exception. The article will explain this mechanism in detail and provide correct column configuration methods to help develop

Aug 25, 2025 pm 01:00 PM

Check if Row Schema contains specified fields in Apache Spark

This article details how to efficiently check whether the StructType schema of a Row object contains a specific field name in Apache Spark. We will explore two main public methods: using the exists method to combine predicate functions for flexible matching, and using the getFieldIndex method to determine whether a field exists and obtain its index, and provide corresponding code examples to help developers accurately verify the data structure.

Aug 25, 2025 pm 12:57 PM