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Technical Articles

Java

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Android BLE ad stop failure problem analysis and solution

This article aims to solve the problem that Bluetooth low power (BLE) advertising cannot be stopped properly on Android platforms. The core is that when starting and stopping BLE ads, the same AdvertiseCallback instance must be used. The article will elaborate on this key principle in detail and demonstrate the correct advertising start and stop process through code examples, emphasizing the importance of AdvertiseCallback as a unique identifier for advertising sessions, helping developers ensure the stability and reliability of BLE advertising functions.

Aug 14, 2025 pm 11:33 PM

Use Selenium to implement page loading retry mechanism

This article aims to provide a general Selenium page loading failure retry mechanism. Through dynamic functions combined with page loading strategy and document.readyState status check, it can automatically refresh and retry when the page loads blank or is not fully loaded, thereby improving the stability and reliability of automated tests and avoiding test failures caused by network fluctuations and other reasons.

Aug 14, 2025 pm 11:12 PM

Generate titles that accurately express the subject of the article The correct way to find the first non-repeat character in a string

This article aims to solve the problem that the program returns the entire input string when looking for the first non-repeat character in a string. Improve code efficiency and accuracy by improving the code by ensuring that the program returns only the required non-repetitive characters, rather than the entire input string. This article will provide a modified code example and explain how it works.

Aug 14, 2025 pm 10:57 PM

Calculate the number of unique characters in a string and optimize the time complexity

This article aims to explore how to efficiently calculate the number of unique characters in a given string. In response to this problem, although the theoretical lower limit of time complexity is O(n), it can be achieved by optimizing the selection of data structures and algorithms to reduce memory usage in specific scenarios and improve actual performance. This article will introduce in detail the conventional method of using hash sets (HashSet), and propose a method based on array counting to analyze its advantages and disadvantages and applicable scenarios.

Aug 14, 2025 pm 10:54 PM

Solve the problem of generic type mismatch in Predicate in Java Stream

This article aims to resolve the issue of Predicate generic type mismatch due to instanceof checking when using the Java Stream API. By analyzing the cause of the problem, a solution is provided to use map operations for type conversion and pattern matching using the mapMulti method introduced in Java 16. At the same time, the rationality of method design is also emphasized, and it is recommended to avoid using Object type as a parameter, and follow the principle of single responsibility to improve the maintainability and readability of the code.

Aug 14, 2025 pm 10:39 PM

How to collect a list of third-party JAR packages used in a Maven project

This article describes how to use the Maven command to quickly collect a list of all third-party JAR packages used in a project. With the mvn dependency:build-classpath command, you can easily obtain a string containing all dependency JAR package paths, making dependency management and review convenient.

Aug 14, 2025 pm 10:27 PM

Resolve Google Calendar API Service Account 403 Permission Error: In-depth Guide

This article aims to dig into the 403 Forbidden permission errors encountered when using the Google Calendar API to operate calendars through service accounts. We will parse the common causes of this error in detail, including improper domain-wide delegation configuration, lack of user identity simulation, and restrictions on using service accounts on personal Gmail accounts. The article will provide professional solutions and precautions to help developers correctly configure and use service accounts to effectively manage Google Workspace user calendars and avoid common permission problems.

Aug 14, 2025 pm 10:21 PM

R2DBC and Liquibase integration issue: Solution not found in tables

This article aims to resolve the "Table not found" exception encountered when using Spring Boot R2DBC integrated Liquibase. Usually, this problem stems from conflicts between R2DBC and Liquibase configurations, as well as their different handling of database connection methods. This article will dig into the cause of the problem and provide practical solutions to help developers successfully integrate Liquibase into R2DBC projects and ensure the correct initialization of the database schema.

Aug 14, 2025 pm 09:33 PM

Use the void method to change the state of boolean variables in Java

This article will introduce how to use void methods in Java to change the state of boolean variables and implement the conversion from closed to open. We will use a simple example to demonstrate how to create a class containing the boolean state and modify the state using the void method to achieve state switching.

Aug 14, 2025 pm 09:18 PM

How to use regular expressions to accurately validate the 'true' and 'false' values in Java?

This article aims to provide a simple and efficient Java method for precise verification of whether a string is "true" or "false". Avoid complex regular expressions, use string comparisons directly, and provide a clearer and more efficient solution, ensuring that only strings that exactly match "true" or "false" can pass verification.

Aug 14, 2025 pm 08:57 PM

How to use an abstract class in Java

Use abstract classes when you need to define a common base class for a group of related classes but cannot or does not need to provide a complete implementation of all methods; 2. The abstract class can contain abstract methods (no implementation) and concrete methods (with implementation), and allows fields, constructors and non-public members to be defined; 3. Subclasses must inherit the abstract class and implement all their abstract methods, otherwise they must also be declared as abstract classes; 4. The abstract class cannot be instantiated directly; 5. The abstract class can be used to point to the subclass object through polymorphism to achieve flexible calls. For example, Animal is an abstract class, Dog and Cat inherit and implement makeSound(), and the corresponding implementation can be called through AnimalmyPet=newDog().

Aug 14, 2025 pm 08:41 PM

Extract LinearSVC model coefficients and intercepts using Apache Flink ML

This document describes how to extract coefficients and intercepts of LinearSVC models in Apache Flink ML. By obtaining the hyperplanar parameters of the model, the classification rules of the linear support vector machine (SVM) can be applied to the pattern matching API of Flink CEP. This article provides sample code for two languages, Python and Java, to help developers extract the required information from trained LinearSVC models.

Aug 14, 2025 pm 08:33 PM

How to delete a file in Java

UseFiles.deleteIfExists(path)forsafefiledeletionwithoutexceptionsifthefiledoesnotexist.2.Preferjava.nio.file.Filesoverjava.io.Fileforbettererrorhandlingwithspecificexceptions.3.Alwaysensurethefileisnotinuseandthattheprogramhasproperpermissions.4.Usea

Aug 14, 2025 pm 08:22 PM

How to create a generic method in Java

To create a general method in Java, you need to declare the type parameter in angle brackets before returning the type, for example, and then use the type in the parameter, return value or method body; 1. The syntax is the return type method name (T[]array), such as publicstaticvoidprintArray(T[]array); 2. When calling, Java can usually automatically infer the type, such as printArray(words) to infer T as String, or you can also explicitly specify MyClass.printArray(words); 3. Support multiple type parameters, such as voidprintPair(Kkey,Vvalue); 4. You can restrict the type to Numbe by limiting the type to Numbe

Aug 14, 2025 pm 08:06 PM