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Technical Articles

Java

javaTutorial

Solutions that Android Dialog cannot be turned off: Avoid duplicate instance creation

This article provides a common solution to the problem that Dialog cannot be closed normally in Android development. The core of the problem is that new instances are created each time Dialog is displayed and closed, causing the shutdown to act on the undisplayed instance. This problem can be effectively solved by declaring the Dialog instance as a global variable and reuse it when needed. At the same time, moving Dialog's custom settings to the Dialog class can improve the organization and maintainability of the code.

Sep 09, 2025 am 08:18 AM

Logical optimization practice of conditional judgment and message output in Java loop

This article discusses how to avoid duplicate or incorrect feedback information due to improper logical structure when dealing with conditional judgments within loops in Java. By analyzing a real case of vehicle inventory updates, we reveal common pitfalls of putting “not found” messages inside an else block. The article provides two core solutions: using Boolean flags to uniformly judge after the loop ends, and using an early return mechanism when determining that there is only one match, aiming to help developers build more robust and logically clearer programs.

Sep 09, 2025 am 07:57 AM

Efficient conversion of Java strings to Map: a robust solution for handling comma values

This article aims to provide a tutorial on converting strings of specific formats (such as "\"Key\":\"Value\",\"Key2\":\"Value with, comma\"") to Map in Java. We will focus on how to use the String::split method combined with precise separators to effectively handle complex situations where commas are included in values, avoid third-party libraries, and ensure the lightweight and broad applicability of the solution.

Sep 09, 2025 am 07:24 AM

How to find the factorial of an integer in Java

The factorials can be efficiently calculated using loops (iterations) and the time complexity O(n) and the space complexity O(1), which is suitable for processing large numerical values; 2. The recursive code is concise and easy to understand, but there is a risk of stack overflow, and it is only applicable to decimal values; 3. For numbers over 20, BigInteger should be used to avoid overflow and can accurately calculate large factorials; 4. The input must be verified and negative numbers are rejected. Choose the appropriate method based on performance, readability and numerical range.

Sep 09, 2025 am 06:58 AM

What is the servlet lifecycle in Java?

Theservletlifecyclebeginswithloadingandinstantiationwhenthecontainercreatesaservletinstance.2.Thecontainercallstheinit()methodonceforinitialization,wheresetuptasksareperformed.3.Theservice()methodhandleseachclientrequestbydispatchingtoappropriateHTTP

Sep 09, 2025 am 06:57 AM

java servlet

Tutorial on passing parameters through Java methods to update XML tag values

This article describes how to pass parameters to XML documents through Java methods and update the value of the specified XML tag. We will use XSLT conversion technology to call the XSLT converter through Java code to achieve the requirement of dynamically updating the content of XML documents. This method is flexible and efficient, and is suitable for scenarios where XML configuration files need to be dynamically modified according to Java program logic.

Sep 09, 2025 am 06:45 AM

What is the difference between Hibernate and JPA in Java?

JPAisaspecificationthatdefineshowJavaobjectsmaptodatabasetables,whileHibernateisawidelyusedimplementationofJPAthatprovidestheactualfunctionality;JPAservesasastandardinterfaceforportability,allowingdifferentproviderslikeHibernateorEclipseLinktoimpleme

Sep 09, 2025 am 05:51 AM

what is serialization and deserialization in java

SerializationinJavaconvertsanobjectintoabytestreamforstorageortransmission,anddeserializationreconstructstheobjectfromthatbytestream,withtheclassneedingtoimplementSerializable,useoftransientforexcludedfields,andserialVersionUIDforversioncontrol,ensur

Sep 09, 2025 am 05:48 AM

Serialization Deserialization

Resolve Eclipse update failure: conflict dependency problem

This article aims to help resolve the "Cannot complete the install because of a conflicting dependency" error encountered when Eclipse updates. This error is usually caused by incompatible with the older version of Mylyn plug-in. This article will guide you to uninstall the old Mylyn component to successfully complete the Eclipse update.

Sep 09, 2025 am 05:24 AM

Best Practices for Managing Dependencies in a Large Java Project

UseMavenorGradleconsistentlywithcentralizedversionmanagementviaparentPOMsordependencyconstraints.2.Minimizedependenciesbyauditingregularly,removingunusedones,andexcludingunnecessarytransitivedependencies.3.Standardizeversionsacrossmodulesusingpropert

Sep 09, 2025 am 03:55 AM

java Dependency management

Java JUnit unit test: Verify the object, null value and specific instance returned by the method

This article aims to explain in detail how to verify the object returned by a method in Java JUnit unit tests. The content covers how to assert null values ??using assertNull(), and how to assert the specific object instance or its value equality returned by assertEquals() (combined with equals() methods) and assertSame() to ensure that the code behavior is in line with expectations and improve the comprehensiveness and accuracy of the test.

Sep 09, 2025 am 03:03 AM

How to create an immutable class in Java

Maketheclassfinaltopreventsubclassing.2.Makeallfieldsprivateandfinaltopreventexternalaccessandmodification.3.Donotprovidesettermethodstoavoidstatechanges.4.Initializeallfieldsthroughtheconstructorforcompleteandsafeinitialization.5.Protectmutableobjec

Sep 09, 2025 am 02:43 AM

What is an IDE for Java?

AnIDEforJavaisasoftwareapplicationthatintegratestoolsforwriting,testing,anddebuggingcodeinaunifiedenvironment,makingdevelopmentmoreefficient.Itprovidessmartcodeeditingwithfeatureslikeauto-completion,syntaxhighlighting,andreal-timeerrordetection,reduc

Sep 09, 2025 am 02:37 AM

java ide

The Role of the `invokedynamic` Bytecode in Modern Java

invokedynamicisaJVMbytecodeintroducedinJava7thatenablesdynamicmethodinvocationbydeferringmethodresolutiontoruntimeviaabootstrapmethod.1.Itallowslatebindingofmethodcalls,makingitidealfordynamiclanguageslikeGroovyandJRubybysupportingruntimetype-baseddi

Sep 09, 2025 am 02:31 AM