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Technical Articles

Java

javaTutorial

Best Practices for Logging in Java Applications

UsealoggingframeworklikeSLF4JwithLogbackorLog4j2insteadofSystem.out.printlntoenableconfigurabilityandflexibility.2.Applyappropriateloglevels(ERROR,WARN,INFO,DEBUG,TRACE)tocontrolverbosityandprioritizeinformation,configuringthemperenvironment.3.Struct

Aug 12, 2025 am 11:41 AM

java log

How to generate a UUID in Java?

UseUUID.randomUUID()togenerateaversion4UUID,whichisrandom-basedandsuitableformostusecaseslikesessionortransactionIDs;2.Forname-basedUUIDs,useUUID.nameUUIDFromBytes()tocreateaversion3UUIDusingtheMD5hashofagivenname;3.BeawarethatJava’sstandardlibrarydo

Aug 12, 2025 am 11:36 AM

java uuid

Google Calendar API service account permission management and common 403 error analysis

This article dives into the 403 Forbidden error encountered when updating calendar events through service accounts using the Google Calendar API. The article analyzes that this error is usually caused by inappropriate configuration of Domain-Wide Delegation, lack of authorized users, or attempts to use a service account on a standard Gmail account. At the same time, the article emphasizes the difference between service accounts and traditional OAuth user authorization model and provides targeted solutions and best practices aimed at helping developers correctly configure service accounts to implement programming management of calendar events.

Aug 12, 2025 am 11:33 AM

Android ImageView Anchor Scaling Tutorial

This tutorial is designed to guide developers how to implement the anchor scaling function of ImageView in Android applications. By adding draggable anchor points at the four corners of the ImageView, users can drag these anchor points to scale the image for finer image manipulation. The tutorial will provide key code snippets that implement the feature and explain the principles behind it to help developers quickly master the technology.

Aug 12, 2025 am 11:27 AM

Correct posture and code optimization practice for Java string comparison in Android development

This tutorial explores the correct way to compare strings in Java, emphasizing using equals() instead of == to avoid common errors. The article explains the difference between == and equals() in detail and provides code examples. At the same time, the tutorial also introduces how to use Lambda expressions to simplify Android event listener code, improve code readability and simplicity, and help developers master efficient and robust string processing and UI interaction logic through optimized sample code.

Aug 12, 2025 am 11:15 AM

What are the best practices for exception handling in Java?

UsespecificexceptionslikeFileNotFoundExceptioninsteadofgenericoneslikeExceptiontoimproveclarityanddebuggability.2.Alwayscleanupresourcesusingtry-with-resourcestoensureautomaticclosureoffiles,streams,andconnections.3.Neverignoreexceptions;alwayslogthe

Aug 12, 2025 am 11:14 AM

How to use regular expressions in Java

Using Java regular expressions requires compiling the pattern first and then creating a matcher for operation. 1. Use Pattern.compile() to compile a regular string into a Pattern object to improve reuse efficiency; 2. Call Pattern's matcher() method to generate a Matcher object with input strings; 3. Use Matcher's matches() to determine the exact match, find() to find all substring matches, and lookingAt() to determine the starting match; 4. Define the capture group through brackets and extract the matching content using group(1), group(2) and other methods; 5. Use replaceAll() or replaceFirst() to implement it

Aug 12, 2025 am 11:01 AM

How to create a generic class in Java

The method to create a generic class is: 1. Add type parameters after the class name, such as publicclassBox; 2. Use T as the type of member variables and method parameters, such as privateTvalue; 3. You can use multiple type parameters, such as Pair; 4. You can set boundary restriction types through the extends keyword, such as TextendsNumber; 5. You can define generic methods in ordinary classes, such as publicstaticvoidprintArray(T[]array); 6. Specify specific types when instantiating, such as BoxstringBox=newBox(), and use the diamond operator to implement type inference. This can achieve type safety and avoid forced conversion

Aug 12, 2025 am 11:00 AM

java Generics

How to properly handle non-UTF-8 encoded HTTP request bodies in Spring Boot

This tutorial aims to solve the garbled problem encountered by Spring Boot applications when handling HTTP request bodies that are not UTF-8 encodings (such as Windows-1252). The core is to identify and correct common misunderstandings in the test method: when sending a request using cURL, if the request body content itself is not generated according to the specified encoding, even if the Content-Type header is set, it may cause a server-side decoding error. The article will elaborate on how to correctly simulate requests for different encodings, and explain the default processing mechanism of Spring Boot and its underlying containers for request encoding, helping developers effectively solve character encoding compatibility challenges.

Aug 12, 2025 am 10:54 AM

A deep understanding of Java object memory allocation: the impact of methods and interfaces

This article discusses the memory allocation mechanism of objects and methods in Java in depth. The core point is that Java methods are loaded only once when the class is loaded and stored in the method area, rather than each object instance has an independent memory copy of its method. The memory allocated by an object on the heap is mainly used to store its instance fields and a small amount of object header information. Therefore, even if a subclass object is referenced through an interface type, the subclass-specific method does not allocate additional memory for that particular object, because the method itself is a class-level resource.

Aug 12, 2025 am 10:48 AM

How do you implement a singleton pattern in Java?

ThesingletonpatterninJavaensuresaclasshasonlyoneinstanceandprovidesglobalaccess,withimplementationchoicesdependingonrequirements:eagerinitializationcreatestheinstanceatclassloading,ensuringthreadsafetybutlackinglaziness;lazyinitializationwithdouble-c

Aug 12, 2025 am 10:41 AM

How to convert a string to an integer in Java?

The most common method to convert a string to an integer is to use Integer.parseInt(). 1. Use Integer.parseInt() to convert the string to a basic type int, but the string must be a valid number, otherwise a NumberFormatException will be thrown; 2. To avoid exceptions, try-catch should be used to handle invalid input or null values; 3. You can remove whitespace characters through trim() to ensure the conversion is successful; 4. For different hexadecimal or binary, you can use Integer.parseInt(str,radix) or Integer.decode(); 5. If you need to return Inte

Aug 12, 2025 am 10:35 AM

Flexible matching of keys in Java Properties files: Handle partial key name search issues

This article explores the solution when you need to find the corresponding value based on part of the key name (rather than the full key name) in the Java java.util.Properties file. Since the getProperty() method only supports exact matching, the article introduces how to flexibly locate and obtain the required values by iterating over all key collections of Properties objects and combining string matching methods such as contains() or endsWith() to meet the needs of dynamic or partial key name searches.

Aug 12, 2025 am 10:12 AM

What are arrays in Java?

ArraysinJavaarefixed-size,type-safedatastructuresthatstoremultiplevaluesofthesametypeincontiguousmemorylocations,withindexingstartingat0;theyaredeclaredusingsyntaxlikeint[]numbers=newint[5]orinitializedwithvaluessuchasint[]scores={85,90,78,95,88},all

Aug 12, 2025 am 10:03 AM

java array