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Technical Articles

Java

javaTutorial

Solve the issue that CMake on macOS cannot correctly detect Temurin JDK 8 JNI

This article aims to solve the problem that CMake's FindJNI module cannot correctly detect JNI paths when using Adoptium Temurin JDK 8 in macOS environment. Even if JAVA_HOME is configured correctly, CMake may still report an error prompt that the JNI-related path is missing. This tutorial will provide a detailed introduction to how to successfully configure and compile JNI-dependent C/C projects by explicitly passing the key variables required by JNI in the CMake build commands to ensure smooth development process.

Aug 18, 2025 am 08:36 AM

How to use pattern matching for instanceof in Java

Java14 introduces pattern matching of instanceof, 1. Eliminates redundant type conversion without manual casting; 2. Automatically process null checks, return false when null, and pattern variables are not assigned; 3. It can be used in complex conditions, but pattern variables are only valid on the right side of instanceof expression; 4. Supports reference types such as classes, interfaces, arrays, etc., but due to type erasure, it cannot be used for generic specific types; the scope of variables is limited to the area where the compiler can determine its assigned value. This feature makes the code more concise, safe and easy to read, and requires support from Java 14 and above.

Aug 18, 2025 am 08:28 AM

java

Lifecycle and memory management strategies of Spring singleton beans

Spring singleton beans are created at the application startup and exist with the application context and cannot be automatically released by the garbage collection mechanism. For stateless singleton beans, their memory footprint is usually minimal. However, for beans that hold internal states, if memory is needed, you can use Spring cache abstraction or memory cache schemes such as Caffeine and Guava to manage the data life cycle by setting expired policies, thereby indirectly releasing related memory.

Aug 18, 2025 am 08:15 AM

Jakarta EE vs Spring: Choosing the Right Java Enterprise Framework

JakartaEEemphasizesstandardization,portability,andvendorneutrality,makingitidealforregulatedindustriesandlegacyenterprisesystems;2.Spring,especiallySpringBoot,prioritizesdeveloperflexibility,rapiddevelopment,andcloud-nativecapabilitieswitharichecosys

Aug 18, 2025 am 08:09 AM

spring java ee

how to perform a binary search in java

Binary search is an algorithm that efficiently finds target values in an ordered array. The core answer is: you must first ensure that the data is sorted, and then position the target values by constantly dividing the search interval into two. 1. When using built-in Java methods, you can directly search through Arrays.binarySearch(). If the array is not sorted, the index will be returned, otherwise a negative insertion point will be returned; 2. Manual implementation can be divided into two ways: recursion and iterative. The recursive implementation code is concise but the spatial complexity is O(logn), and the iterative implementation space complexity is O(1), which saves memory; 3. No matter which method, the array must be ordered, and the calculation of the midpoint should be left (right-left)/2 to prevent integers.

Aug 18, 2025 am 08:01 AM

java binary search

Open Google Maps and set up GPS navigation using Java

This article describes how to use Java programs to open Google Maps and automatically set up GPS navigation from specified location A to specified location B. Automatic navigation function can be achieved by building a Google Maps URL in a specific format and opening the URL using Java's java.awt.Desktop class. This article provides clear code examples and detailed step instructions to help developers implement this function quickly.

Aug 18, 2025 am 07:48 AM

How to use annotations in Java

Java annotations enhance code functionality by adding metadata, which does not change the logic but affects the compilation or operation behavior. 1. Use built-in annotations such as @Override to ensure the method is rewrite correctly, @Deprecated marks outdated elements, and @SuppressWarnings suppresses warnings; 2. Create custom annotations with @interface, which can include member variables and set default values, and combine @Target, @Retention and other meta annotations to limit the usage scope and life cycle; 3. Process annotations at runtime through reflection, such as whether the scanning method marks @LogExecutionTime and records the execution time; 4. Common frameworks such as Spring, JUnit, Hib

Aug 18, 2025 am 07:42 AM

How to dynamically load a class in Java?

UseClass.forName("fully.qualified.ClassName")toloadaclassdynamicallyatruntime,optionallycreatinganinstancewithgetDeclaredConstructor().newInstance();2.ForexternalJARs,useURLClassLoadertoloadclassesfromspecificpaths;3.Ensuretheclassnameisful

Aug 18, 2025 am 07:30 AM

What are the primary differences between a Set and a List in Java?

Duplicates:Listallowsduplicates,whileSetdoesnot;2.Ordering:Listmaintainsinsertionorder,Setdoesnotbydefault(exceptLinkedHashSetandTreeSet);3.Access:Listsupportsindex-basedaccessviaget(index),Setdoesnot;therefore,useListforordered,indexedelementswithpo

Aug 18, 2025 am 06:56 AM

java gather

How do you write to a file in Java?

There are many ways to write files, mainly depending on the requirements: PrintWriter is suitable for formatting text output, the code is simple and easy to read, but it will overwrite the original file by default; Combining FileWriter and BufferedWriter is suitable for large amounts of text writing, improve performance through buffering, and append it can be achieved through FileWriter("output.txt", true); Java7 and above recommend using Files.write(), which has concise syntax and supports direct writing to byte arrays or string lists, and overwrite files by default. If you need to append, you should add StandardOpenOption.APPEND option; no matter which method is

Aug 18, 2025 am 06:19 AM

Migrating a Legacy Java Application to Java 17

AssessyourcurrentcodebasebycheckingtheJavaversion,inventoryingdependencies,identifyinginternalAPIusage,andensuringbuildtoolcompatibility.2.UpdatebuildconfigurationsinMavenorGradletotargetJava17andadjustJVMflagsifnecessary.3.Addressbreakingchangessuch

Aug 18, 2025 am 06:07 AM

Introduction to gRPC for High-Performance Java Services

gRPCexcelsinhigh-performanceJavaservicesbyleveragingHTTP/2andProtocolBuffersforlow-latency,efficientcommunication.1)ItreducespayloadsizeandCPUusagethroughbinaryserializationwithprotobuf.2)Itenablesbidirectionalstreamingforreal-timeusecaseslikechatord

Aug 18, 2025 am 06:03 AM

what is the transient keyword in java

ThetransientkeywordinJavapreventsafieldfrombeingserializedduringobjectserialization.Whenanobjectisserialized,onlynon-transientandnon-staticfieldsaresavedautomatically,somarkingafieldastransientexcludesitfromtheprocess.Thisisusefulforsecurityreasons,s

Aug 18, 2025 am 05:31 AM

java

What is connection pooling in Java?

ConnectionpoolinginJavaimprovesdatabaseinteractionperformancebyreusingpre-establishedconnectionsinsteadofcreatingnewoneseachtime,reducingtheoverheadoffrequentconnectionsetupandteardown.Whenanapplicationneedsadatabaseconnection,itretrievesonefromthepo

Aug 18, 2025 am 04:54 AM