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Android custom Dialog cannot dismiss the solution

This article aims to solve the problem that custom Dialog cannot dismiss properly in Android development. By analyzing common reasons, an effective way to manage Dialog instances as class member variables and display and close when needed. At the same time, it is recommended to place Dialog initialization and style settings inside the Dialog class to improve the maintainability and readability of the code.

Aug 24, 2025 am 10:27 AM

Efficient way to build BigInteger from byte arrays

This article aims to describe how to efficiently convert an array of bytes into a BigInteger object, especially when handling encrypted or encoded data, such as encoded one byte into four bytes. We will explore ways to avoid unnecessary binary conversions and loops, directly use byte arrays to build BigInteger, and provide sample code and precautions for flexible use in practical applications.

Aug 24, 2025 am 10:15 AM

Use Java Stream to find Map with maximum value in List

This article describes how to use the Java Stream API to find a HashMap with the largest Length value from an ArrayList. The article first suggests using custom objects instead of HashMap to improve code readability and type safety. Then, we explain in detail how to find a single largest element using Stream.max() and Collections.max(), and how to find all the collections of elements with maximum values ??using groupingBy() and collect(), and provide the corresponding sample code.

Aug 24, 2025 am 10:12 AM

Retrieve data of JSON objects from JSON Simple library

This article describes how to retrieve data from JSON objects using the JSON Simple library. With a simple example, it demonstrates how to parse a JSON string containing a username, address, and password and use the get() method to get the value of a specific key. This article will help you understand the basic usage of the JSON Simple library and avoid common null pointer exceptions.

Aug 24, 2025 am 10:09 AM

Automatically inject dependencies and Mock objects with JMockit

This article describes how to use the JMockit framework to automatically inject dependencies and Mock objects into test classes. With @Tested and @Injectable annotations, instances of the tested class can be easily created and their dependencies are automatically injected into the Mock object, thus simplifying the writing process of unit testing. The article also provides a simple example that demonstrates how to use JMockit for dependency injection and Mock object creation, and emphasizes the importance of configuring JMockit Java Agent.

Aug 24, 2025 am 10:03 AM

Mocking WebClient requests with Mockito: Solve FAQs in unit testing

This article aims to address how to use Mockito in unit tests to get the expected response when sending requests using WebClient. The article will analyze common errors and provide feasible solutions, including how to properly mock the WebClient object and how to handle parameter matching issues for the BodyInserters.fromValue() method.

Aug 24, 2025 am 10:00 AM

Tutorial: How to exit loop through user input in Java

This tutorial is designed to explain how to flexibly exit a for loop or while loop through user input in a Java program. We will introduce how to use the BufferedReader class to read user input and determine whether the input is an exit instruction in the loop, thereby achieving flexible control of the program. At the same time, some code optimization suggestions will be provided to help you write more concise and efficient Java code.

Aug 24, 2025 am 09:48 AM

What is the use of the transient keyword in Java?

Use the transient keyword because it prevents the fields from being serialized. 1. Transient is used to mark instance fields that do not want to be serialized; 2. When serialized, fields modified by transient will be skipped; 3. After deserialization, the value of the transient field is the default value, such as the object is null, the integer is 0, and the boolean is false; 4. Transient is not suitable for static fields, because the static field itself will not be serialized; 5. Common uses include protecting sensitive information, excluding temporary data, avoiding serialized resource references, or improving performance; 6. If you need to restore the transient field, you can override the readObject() method to achieve custom logic. therefore

Aug 24, 2025 am 09:40 AM

java

Loading GLSL shader in Vulkan using Java

This article describes how to load and use GLSL shaders using Vulkan API in Java. The core step is to compile the GLSL shader into SPIR-V binary format and load it into the Vulkan pipeline. By using tools like ShaderSPIRVUtils, the compilation process can be simplified and the shader code executes correctly in the Vulkan environment. This article will provide detailed steps and examples to help developers integrate GLSL shaders in Java Vulkan projects.

Aug 24, 2025 am 09:21 AM

Loading GLSL shader file in Vulkan using Java

This article describes how to load and use GLSL shader files using the Vulkan API in Java. This highlights the compilation of GLSL shaders into SPIR-V binary format, and provides a GitHub tutorial link to help developers get started quickly. Through this article, you will be able to master the key steps in integrating GLSL shaders in your Java Vulkan program.

Aug 24, 2025 am 09:15 AM

Logback log output alignment practice in Spring Boot

This article will explore in-depth how to configure the Logback log framework to achieve accurate alignment of SLF4J log output in Spring Boot applications. The core is to understand the separation of SLF4J as a log facade and Logback as a specific implementation, and to use Logback's powerful pattern formatting function, especially width and alignment modifiers, to optimize the readability of the log and ensure the neat arrangement of key elements such as class names and separators.

Aug 24, 2025 am 09:03 AM

What is a NoClassDefFoundError in Java?

ANoClassDefFoundErroroccurswhenaclasswaspresentduringcompiletimebutcannotbefoundorinitializedatruntime,typicallyduetoclasspathissuesorstaticinitializationfailures;commoncausesincludemissingJARfiles,incorrectbuildprocesses,orclassinitializationexcepti

Aug 24, 2025 am 08:37 AM

java

How to use the finally block in Java

Thefinallyblockalwaysexecutesafteratry-catchblock,regardlessofwhetheranexceptionoccursorishandled,ensuringcriticalcleanupcoderuns.2.Itiscommonlyusedtocloseresourceslikefiles,databaseconnections,ornetworkstreams,asshownwithFileReaderbeingclosedinafina

Aug 24, 2025 am 08:28 AM

java

How to tune the JVM

JVM tuning requires first clarifying application requirements, and then targeted adjustments through monitoring data. 1. Analyze application behavior: Use jstat, GC log and other tools to judge memory and CPU usage patterns. 2. Reasonably set the heap size: -Xms and -Xmx are set to the same value (such as -Xms2g-Xmx2g), which will not exceed 70-80% of the physical memory. 3. Choose the appropriate garbage collector: use -XX: UseParallelGC for throughput first, use -XX: UseG1GC for balanced scenarios, and choose -XX: UseZGC or Shenandoah for ultra-low latency. 4. Optimize for G1GC: Set -XX:MaxGCPauseMillis=200 and other parameters to control the pause time.

Aug 24, 2025 am 08:19 AM

java jvm tuning