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Technical Articles

Java

Update Google Calendar with Service Account: Resolve 403 Forbidden Error

This article explores the common 403 Forbidden errors when updating user calendars with Google Services accounts and provides detailed solutions. The core content includes understanding the relationship between service accounts and calendar access rights, correctly configuring domain-wide authorization (DWD), and distinguishing the restrictions of Google Workspace accounts from standard Gmail accounts when using service accounts. The article will also clarify the differences between OAuth 2.0 user authorization and service account authorization, helping developers effectively manage calendar events.

Aug 12, 2025 pm 12:15 PM

What is a LinkedList in Java?

LinkedList is a bidirectional linked list in Java, implementing List and Deque interfaces. It is suitable for scenarios where elements are frequently inserted and deleted. Especially when operating on both ends of the list, it has high efficiency, but the random access performance is poor and the time complexity is O(n). Insertion and delete can reach O(1) at known locations. Therefore, it is suitable for implementing stacks, queues, or situations where structures need to be dynamically modified, and is not suitable for read-intensive operations that frequently access by index. The final conclusion is that LinkedList is better than ArrayList when it is frequently modified but has fewer accesses.

Aug 12, 2025 pm 12:14 PM

java

Analysis and solution for data loss problem in Java methods

This article aims to solve the problem of data loss after Java methods are executed. Explain why data created or modified within a method "disappears" after the method is finished by explaining Java's parameter value transfer mechanism and local variable scope. The article provides solutions to effectively pass data through method return values, and comes with code examples to help developers build more robust programs.

Aug 12, 2025 pm 12:12 PM

How to properly configure Spring Boot to handle non-UTF-8 encoded requests

This article discusses the common garbled problems encountered by Spring Boot applications when handling non-UTF-8 (such as Windows-1252) encoding requests. The article first reveals the misunderstandings that may be caused by improper use of curl commands when simulating different encoding requests, and provides detailed steps to create and send correct encoding requests. Subsequently, the processing mechanism of character encoding by Spring Boot and its embedded Servlet container is analyzed, emphasizing the importance of Content-Type header. Finally, troubleshooting ideas and best practices to solve this type of problem are provided to ensure coding consistency between the client and the server.

Aug 12, 2025 pm 12:00 PM

Guide to Integration of CMake and Temurin JDK 8 in macOS Environment

This article aims to solve the common problem that CMake cannot correctly detect JNI libraries during the build process when using Temurin JDK 8 on macOS systems. Even if the JAVA_HOME environment variable is correctly configured, CMake's FindJNI module may still report an error. This tutorial will introduce in detail the overcoming of this obstacle by explicitly setting JNI-related inclusion paths and variables in CMake calls, ensuring that the project can compile and link the JNI interface smoothly, providing developers with a stable and reliable solution.

Aug 12, 2025 am 11:48 AM

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