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Technical Articles

Java

javaTutorial

Implement controllable task interrupts and cancellations in ExecutorService

This article explores in-depth how to implement graceful interrupts and cancellations of tasks being executed in Java ExecutorService. We first elaborate on the cooperation mechanism of Java thread interrupts, and then analyze the functions and limitations of the ExecutorService.shutdownNow() method. In response to the user's need to cancel specific tasks without closing the entire service, the article focuses on how to use the Future interface and its cancel(true) method to achieve selective task interrupts, and provides detailed code examples and guidance on writing interruptible tasks, aiming to help developers build more robust and responsive concurrent applications.

Aug 15, 2025 am 11:03 AM

Optimization code: Use Comparator to merge the method to find the maximum and minimum values of an array

This article aims to describe how to combine two similar methods that find the maximum and minimum values in an array into a more general method using the Comparator interface in Java. By passing different Comparator implementations, you can flexibly control the comparison logic, thereby finding the "maximum" under maximum values, minimum values, or other custom comparison rules. This approach not only reduces code redundancy, but also improves code reusability and maintainability.

Aug 15, 2025 am 11:00 AM

Strategy to ensure the reading of combined data atoms in Java concurrency environment

This article discusses how to ensure the data consistency when reading data, keys and size from the LocalCache class in the Java concurrency environment. For different scenarios, methods such as synchronized keywords, ReadWriteLock and ConcurrentLinkedQueue are introduced, and their respective advantages and disadvantages are analyzed to help developers choose the most suitable solution for their applications.

Aug 15, 2025 am 10:45 AM

Guide to data transmission and analysis of HC-05 Bluetooth module and Android applications

This tutorial aims to solve the problem of data separation and analysis when sending multiple sensor data to Android applications using the HC-05 Bluetooth module. The article details how to optimize the data sending format of the Arduino side, use line breaks as message boundaries, and modify the Bluetooth data receiving thread on the Android side to realize line-by-line reading and precise parsing. Through structured data transmission and efficient parsing logic, we ensure that each sensor data can be correctly displayed on the corresponding UI components, improving system stability and maintainability.

Aug 15, 2025 am 10:24 AM

How to create a package in Java?

To create a Java package correctly, first use the package keyword to declare the package name at the top of the source file, such as packagecom.example.myapp; secondly, place the source file in a directory structure that matches the package name, for example, MyClass.java should be located in the src/com/example/myapp/ directory; then compile from the src root directory: javaccom/example/myapp/MyClass.java, and run it with javacom.example.myapp.MyClass; finally follow best practices: package names are all lowercase, unique, and are grouped by function, and it is recommended to use IDE to automatically manage the package structure

Aug 15, 2025 am 10:23 AM

java package

How to use streams in Java 8?

Java8's StreamAPI realizes efficient data processing through a chain process of source → intermediate operations → terminal operations. 1. Create streams from collections, arrays or values; 2. Intermediate operations such as filter, map, flatMap, distinct, sorted, limit and skip are used to build processing pipelines and are lazy; 3. Terminal operations such as collect, forEach, count, anyMatch, findFirst and reduce trigger execution and produce results; 4. Use Collectors to collect results as List, Set, string or grouping maps; 5. FlatMap is used to flatten nested structures; 6. Avoid

Aug 15, 2025 am 09:57 AM

streams java 8

Dynamic switching of Android view background: state management based on text content

This article details how to dynamically change the background color of the associated view according to the text content of the TextView in Android applications. By analyzing common UI update problems, the tutorial recommends using ContextCompat.getColor() to obtain color resources and combines the setBackgroundColor() method to achieve instant and smooth switching of background colors, thereby effectively improving the responsiveness and user experience of the user interface.

Aug 15, 2025 am 09:48 AM

Strategies for efficiently running and managing a large number of Linux commands in Java applications

This article explores in-depth strategies for efficiently executing and managing thousands of Linux commands such as socat in Java applications. We will introduce how to use ProcessBuilder to start external processes and optimize concurrent execution through thread pool. The emphasis is on the correct handling of process output streams to avoid system resource exhaustion and performance bottlenecks, ensuring that the system remains stable and responsive even in the face of large-scale concurrent operations.

Aug 15, 2025 am 09:36 AM

Use Set to efficiently check whether the list element exists in Java

This article details how to efficiently compare two string lists (such as shopping lists and inventory lists) in Java to determine if all the required items are available. In response to common list misunderstandings among beginners, the article focuses on the advantages of using HashSet data structure for member search, and provides complete sample code to demonstrate how to greatly improve search efficiency by converting lists into Sets, and includes user input processing and best practice suggestions.

Aug 15, 2025 am 09:09 AM

The pitfalls and correct practices of date arithmetic and implicit conversion in Oracle SQL

This article aims to explore in-depth the implicit conversion traps common in date arithmetic in Oracle databases, especially when it comes to the unexpected impact of the TO_DATE function and NLS parameters on the results. We will analyze the behavior of the RRRR format mask when processing two-bit years, and recommend direct date addition and subtraction or TRUNC functions to perform date calculations safely and accurately, avoid unnecessary type conversions, and ensure that the date results are in line with expectations.

Aug 15, 2025 am 08:33 AM

Application of generic interfaces in inheritance: Solve the problem of type mismatch

This article discusses the type matching problem encountered when using generic interfaces for inheritance in Java. Through the example code, we explain in detail how to solve the type incompatibility problem encountered when subclasses initialize parent-class generic interface variables by defining the parent class as well, or using wildcards, and emphasize the importance of declaring interface methods as public.

Aug 15, 2025 am 08:15 AM

Tutorial on username verification based on regular expressions in Java

This tutorial details how to use regular expressions in Java to strictly validate usernames. The content covers regular expression construction of core rules such as username length, starting characters, allowed characters, and cannot be underscore-end, and provides clear code examples and detailed regular component analysis to help developers efficiently implement username verification logic that meets business needs.

Aug 15, 2025 am 08:09 AM

Resolve Java JNI error in VS Code on macOS Ventura

This article aims to help developers resolve JNI errors encountered when running Java programs using VS Code on macOS Ventura systems. By analyzing the error message, it is clear that the root cause of the problem is that the file path contains special characters (such as Emoji or non-ASCII characters). The article will provide detailed troubleshooting steps and solutions to ensure that Java programs run smoothly in VS Code.

Aug 15, 2025 am 08:03 AM

How to validate exact True and False values using boolean types in Java?

This article describes how to strictly verify the value of a Boolean type variable in Java, ensuring that the input value must be true or false. By using the Optional class to perform null value security checks and combined with string comparisons, we provide a method to achieve accurate verification without changing the variable type, effectively avoiding program exceptions caused by input errors.

Aug 15, 2025 am 07:54 AM