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Technical Articles

Java

javaTutorial

How to call non-static methods of existing objects in Java (especially in Swing applications)

This article will explore how to call a non-static method of an existing object in Java, especially in the Swing event processing scenario, without creating a new object instance. The core strategy is to use dependency injection (through constructor or Setter method) or use internal classes to pass references to target objects to classes that need to interact with them, thereby achieving effective control over existing UI components.

Aug 16, 2025 am 07:45 AM

Android BLE AdvertisingSet Broadcast Scan Response Data Configuration Guide

This article aims to solve the problem that Android BLE AdvertisingSet cannot correctly send scan response data when broadcasting. The core is that when configuring AdvertisingSetParameters, setScannable(true) must be called explicitly to allow the device to respond to the scan request and send a scan response packet containing additional data. The tutorial will elaborate on the configuration of AdvertisingSet, the sending mechanism of the scan response, and related code implementation and precautions to ensure that the BLE broadcast data can be received in full.

Aug 16, 2025 am 07:15 AM

How to use the volatile keyword in Java

volatileensuresvisibilityofvariablechangesacrossthreadsandpreventsinstructionreorderingbutdoesnotguaranteeatomicity.2.UsevolatileforstateflagslikeshutdownRequestedtopreventinfiniteloopsduetocachedvalues.3.Applyvolatileindouble-checkedlockingsingleton

Aug 16, 2025 am 07:07 AM

java volatile

How to monitor a Java application

Enable JMX to realize runtime monitoring of Java applications. By configuring JMX remote options and using JConsole or VisualVM to monitor memory, threads, GC, class loading and CPU usage; 2. Use APM tools such as NewRelic, DatadogAPM, AppDynamics, or ElasticAPM to obtain deep monitoring data such as request latency, error rate, distributed tracking and database performance; 3. Integration with Micrometer and Prometheus can expose custom metrics, and combine Grafana to realize visualization of JVM memory, GC, HTTP requests and business metrics; 4. Use structured logs and concentrate them on ELK or Flu

Aug 16, 2025 am 07:01 AM

java monitor

What are JVM arguments in Java?

JVMargumentsareoptionspassedtotheJavaVirtualMachinetocontrolitsruntimebehavior.1.Standardargumentslike-versionand-classpathareuniversallysupported.2.Non-standardargumentsstartingwith-X,suchas-Xms512m,-Xmx2g,and-Xss1m,configureinitialandmaximumheapsiz

Aug 16, 2025 am 06:39 AM

Java System Design for Scalable Web Applications

The following key practices are required to build scalable JavaWeb applications: 1. Adopt a hierarchical architecture and split microservices according to business boundaries, use SpringBoot SpringCloud to achieve independent deployment and expansion; 2. Use SpringWebFlux or Netty to realize asynchronous non-blocking communication, and introduce message queues to achieve decoupling and event-driven; 3. The data layer implements read and write separation, library and table separation (such as ShardingSphere), introduces Redis to cache hotspot data and prevent penetration/breakdown/avangling, and establishes a multi-level storage system; 4. Use SpringCloudGateway or Nginx as API gateways to integrate

Aug 16, 2025 am 06:28 AM

How to create a basic Spring Boot application in Java?

Use SpringInitializr to generate a project, select Maven or Gradle, Java language, the latest stable version of SpringBoot, fill in Group and Artifact information, package it to Jar, Java version 8 or higher, and add SpringWeb dependencies; 2. Download and decompress the project file and open it in the IDE, the project structure includes the main application class, resource file and configuration file; 3. Create the HelloController class under the specified package, use the @RestController and @GetMapping annotations to define the root path and return "Hello, SpringBoot!"; 4. Run DemoAp

Aug 16, 2025 am 06:27 AM

How to use design patterns in Java

Design patterns are used in Java to solve common design problems and improve the maintainability and scalability of code; first of all, we should understand three categories: 1. Creation patterns (such as Singleton, FactoryMethod, AbstractFactory, Builder, Prototype) handle object creation; 2. Structural patterns (such as Adapter, Decorator, Facade, Composite, Proxy) focus on the combination of classes and objects; 3. Behavioral patterns (such as Observer, Strategy, Command, State, and TemplateMethod) involve communication and responsibility allocation between objects;

Aug 16, 2025 am 06:24 AM

java Design Patterns

Micronaut @Error Annotation failure problem troubleshooting and solutions

This article aims to solve the problem of failure when using the @Error annotation for global exception handling in the Micronaut framework. By analyzing the problem code and testing the output, find out the root cause of the wrong HttpRequest import. This article will provide the correct way to import and show how to write test cases using HttpClient to verify the correctness of the exception handler, ensuring that custom exceptions can be properly caught and processed.

Aug 16, 2025 am 06:24 AM

Tutorial on Multi-sensor Data Transmission and Android Application Analysis of HC-05

This tutorial explains in detail how to send multiple ultrasonic sensor data to Android applications through the HC-05 Bluetooth module and realize the effective separation and display of data. The core method is to use line ending characters (such as line breaks\n) to frame the data to ensure the integrity of each message. The receiver reads and buffers data by byte byte until the line end character is detected, and then passes the complete message to the UI thread for parsing and updating, thus solving the problems of confusion in data transmission and difficulty in parsing.

Aug 16, 2025 am 06:12 AM

Null Safe BigDecimal Comparator

This article aims to resolve how to deal with possible null pointer exceptions when sorting a list of objects containing the BigDecimal type in Java. By customizing BigDecimal's comparator and combining Comparator.nullsFirst method, you can achieve null-value-safe sorting of BigDecimal fields, avoiding program crashes, and ensuring the correctness of the sorting results.

Aug 16, 2025 am 06:06 AM

How to use path variables in Java with Spring Boot

Use@PathVariabletoextractvaluesfromURLplaceholdersdefinedwith{}inrequestmapping.2.Specifycustomnamesusing@PathVariable("name")whenparameterandplaceholdernamesdiffer.3.Includemultiplepathvariablesinasingleroutebydefiningmultiple{}placeholder

Aug 16, 2025 am 05:42 AM

Exception handling in Java parallel method calls: Ensure that a single failure does not interrupt the overall process

In Java parallel programming, it is crucial to ensure that one or more of the tasks fail to cause the entire batch process to be aborted when multiple independent tasks need to be executed simultaneously. This article will explore how to gracefully catch and collect exceptions while using CompletableFuture to make parallel method calls, so that even if some tasks fail, it can ensure that all tasks attempts are completed and all errors are handled or reported afterwards.

Aug 16, 2025 am 05:36 AM

How do you read a file in Java?

For reading text files in Java, small files should use Files.readAllLines() to read all lines into the list at one time. For large files, it is recommended to use Files.newBufferedReader() to read line by line to save memory. If streaming is required, you can choose Files.lines() combined with Stream operations. Files.readAllBytes() can be used to load byte arrays when reading binary files. However, you should pay attention to avoid using a method that will load all content on large files to prevent memory overflow. The final choice should be determined based on file type, size and processing requirements.

Aug 16, 2025 am 03:17 AM

java file reading