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Technical Articles

Java

How to use path variables in Java with Spring Boot

Use@PathVariabletoextractvaluesfromURLplaceholdersdefinedwith{}inrequestmapping.2.Specifycustomnamesusing@PathVariable("name")whenparameterandplaceholdernamesdiffer.3.Includemultiplepathvariablesinasingleroutebydefiningmultiple{}placeholder

Aug 16, 2025 am 05:42 AM

Exception handling in Java parallel method calls: Ensure that a single failure does not interrupt the overall process

In Java parallel programming, it is crucial to ensure that one or more of the tasks fail to cause the entire batch process to be aborted when multiple independent tasks need to be executed simultaneously. This article will explore how to gracefully catch and collect exceptions while using CompletableFuture to make parallel method calls, so that even if some tasks fail, it can ensure that all tasks attempts are completed and all errors are handled or reported afterwards.

Aug 16, 2025 am 05:36 AM

How do you read a file in Java?

For reading text files in Java, small files should use Files.readAllLines() to read all lines into the list at one time. For large files, it is recommended to use Files.newBufferedReader() to read line by line to save memory. If streaming is required, you can choose Files.lines() combined with Stream operations. Files.readAllBytes() can be used to load byte arrays when reading binary files. However, you should pay attention to avoid using a method that will load all content on large files to prevent memory overflow. The final choice should be determined based on file type, size and processing requirements.

Aug 16, 2025 am 03:17 AM

java file reading

Java implements random letter combination generation

This article details how to efficiently generate random case Latin combinations in Java. By leveraging the ASCII code characteristics of the Math.random() function and characters, we can precisely control the range and type of generated letters. The tutorial provides clear code examples and deeply analyzes core concepts such as random number generation, type conversion, and character operations. It also explores advanced techniques for generating mixed upper and lower case characters and random strings of specified lengths.

Aug 16, 2025 am 02:57 AM

What are constructors in Java?

ConstructorsinJavaarespecialmethodsusedtoinitializeobjectswhenthey'recreated,ensuringpropersetupbeforeuse.1.Theyhavethesamenameastheclassandnoreturntype.2.Theyrunautomaticallywhenanobjectisinstantiatedwiththenewkeyword.3.Typesincludedefault(provideda

Aug 16, 2025 am 02:51 AM

java Constructor

Mastering Object-Oriented Design in Java

MasterthefourpillarsofOOPbyapplyingencapsulationtoenforcebusinessrules,abstractiontodefineclearcontracts,inheritanceonlyfortrueis-arelationships,andpolymorphismforruntimebehaviorselection;2.ApplySOLIDprinciplesbyensuringsingleresponsibilities,extendi

Aug 16, 2025 am 02:26 AM

How to write a unit test with JUnit in Java

AddJUnitdependencyviaMavenorGradle.2.Createaclasstotest,suchasCalculatorwithaddanddividemethods.3.Writetestmethodsannotatedwith@Test,usingassertionslikeassertEqualsandassertThrowstoverifybehavior.4.RunteststhroughIDE,Maven,orGradle,ensuringallasserti

Aug 16, 2025 am 01:50 AM

unit test junit

How to use input and output streams in Java

JavaI/Ostreamsareessentialforhandlingdatainputandoutputefficiently.1.UseInputStreamandOutputStreamforbyte-baseddata,suchasbinaryfiles,withFileInputStreamandFileOutputStreamforreadingandwriting.2.UseReaderandWriterforcharacter-baseddatatoproperlyhandl

Aug 16, 2025 am 01:40 AM

java 輸入輸出流

What is method overloading in Java?

MethodoverloadinginJavaallowsmultiplemethodswiththesamenamebutdifferentparameters,enablingcleaner,morereusablecodebyvaryingthenumber,type,ororderofparameters;itisresolvedatcompiletimeandsupportspolymorphism,asseeninbothregularmethodsandconstructors,w

Aug 16, 2025 am 12:45 AM

How do you correctly clone an object in Java?

ThecorrectwaytocloneanobjectinJavadependsontheobject’sstructureandmutability,withshallowcloningusingtheclone()methodbeingsuitableonlyforsimplecaseswithnomutablereferences.2.Forobjectscontainingmutablefieldslikelistsornestedobjects,deepcloningisrequir

Aug 16, 2025 am 12:39 AM

Java Streams: Efficiently extract and flatten collection values from Map

This article explores in-depth how Java Streams can be used to efficiently extract the set value corresponding to a specific key from a Map and flatten it into a Stream. The article details three core methods: map.getOrDefault().stream(), flatMap() and mapMulti() introduced in Java 16, and provides corresponding code examples and usage scenario analysis, aiming to help developers optimize data processing processes, avoid unnecessary full Map iteration, and improve code performance and readability.

Aug 16, 2025 am 12:36 AM

What is a record in Java?

ArecordinJavaisaconcisewaytorepresentimmutabledatacarriers,introducedasapermanentfeatureinJava16.2.Itautomaticallygeneratesconstructors,accessors,equals,hashCode,andtoStringmethodsbasedonthefieldsdeclaredintherecordheader.3.Recordsareimmutable,transp

Aug 16, 2025 am 12:18 AM

java record

Accessing data members of parent activity in child activity in Android

This article will describe how to access data members of a parent activity from a launched child activity in an Android application. We will explore the method of using ViewModel to extract business logic into ViewModel, thereby realizing data sharing and avoiding the problems caused by direct access to the parent Activity object.

Aug 15, 2025 pm 02:45 PM

Spring Singleton Bean Memory Management: Lifecycle, Occupancy and Optimization Strategies

This article deeply explores the memory management mechanism and life cycle of Singleton Beans in the Spring framework. Revealing the resident characteristics of singleton beans in the application context and their actual impact on memory usage, especially distinguishing between stateless and stateful beans. The article emphasizes that singleton beans are not usually recycled by GC and provides caching strategies for stateful data management to optimize memory usage.

Aug 15, 2025 pm 02:39 PM