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How to use ExecutorService for managing threads in Java

UseExecutors.newFixedThreadPool(n),newCachedThreadPool(),newSingleThreadExecutor(),ornewScheduledThreadPool(n)tocreateanExecutorServiceformanagingthreadsefficiently.2.Submittasksviasubmit()usingRunnablefornoreturnvalueorCallabletoreturnaresult,obtain

Aug 11, 2025 pm 06:19 PM

Thread management

Android ImageView Anchor Scaling Implementation Guide

This article explains in detail how to implement an interactive ImageView scaling function on the Android platform by listening to user touch drag events and combining Euclidean distance calculation. This solution dynamically adjusts the zoom ratio of the ImageView by tracking the distance between the touch point and the center point of the image, and is suitable for application scenarios where users need to zoom in or out of the image through dragging and dropping.

Aug 11, 2025 pm 06:12 PM

How to deserialize objects in Java

To correctly deserialize an object in Java, you must first use ObjectInputStream to read the byte stream and call the readObject() method to restore the object; 1. Ensure that the class implements the Serializable interface, otherwise NotSerializableException will be thrown; 2. Explicitly declare serialVersionUID to ensure version compatibility and avoid InvalidClassException due to changes in the class structure; 3. The transient field will not be deserialized, its value is the default value, and the static field does not participate in the serialization process. You can custom restore logic through readObject()

Aug 11, 2025 pm 06:09 PM

Loading SVG images using Glide: Configuration, Implementation, and Frequently Asked Questions

This document is intended to guide developers on how to use the Glide library to load SVG images in Android applications. The content covers Glide configuration, integration of SVG support modules, sample code for loading SVG images, and solutions to common problems to help developers successfully load and display SVG images.

Aug 11, 2025 pm 06:00 PM

Selenium Grid 4: Specify nodes to run test cases

This article aims to guide beginners on how to configure nodes and code to direct test cases to specific nodes to run. By setting up custom Capabilities, you can precisely control the nodes on which tests are executed, so that specific testing needs are met, such as testing on a specific version of the browser or on a specific operating system.

Aug 11, 2025 pm 05:51 PM

How to set the classpath for a Java application

Using the -cp or -classpath option is the recommended method for setting Java classpath. 1. Use javac-cp to specify the path when compiling; 2. Use java-cp to include the current directory and JAR file when running; 3. Windows is separated by semicolons, and Linux/macOS is colon; 4. You can specify dependencies through Class-Path in the MANIFEST.MF of JAR; 5. Avoid using global CLASSPATH environment variables; 6. It is recommended to use Maven or Gradle to automatically manage classpaths in the production environment; 7. Be careful not to mix -cp when using -jar, otherwise the classpath will be ignored. Properly setting the classpath prevents ClassNotFound

Aug 11, 2025 pm 05:48 PM

Get DatePicker value from TableView selected cell

This article aims to solve the problem of getting date values from selected rows in JavaFX TableView and setting them correctly to the DatePicker control. The core is to understand the relationship between the column type of TableView and the LocalDate type expected by DatePicker, and provide two solutions: one is to modify the type of TableColumn to LocalDate, and the other is to parse the string value obtained from TableView into a LocalDate object. Through this article, developers can avoid type conversion errors and achieve correct data transmission.

Aug 11, 2025 pm 05:33 PM

Solve the common problem that the Rest Assured type cannot be parsed in Eclipse

This article aims to resolve common errors in which the io.restassured.RestAssured type cannot be parsed when building a project using Maven in the Eclipse IDE. This problem may occur despite the correct configuration of pom.xml, usually due to corruption of the local Maven repository or IDE cache. The core solution is to clean up the local Maven repository and refresh the project to ensure that dependencies are downloaded and identified correctly.

Aug 11, 2025 pm 05:30 PM

In-depth analysis of the memory allocation mechanism of Java objects and methods

This article discusses the memory allocation mechanism of objects and methods in Java in depth. The core is that Java methods do not allocate memory for each object individually, but are loaded only once when the class is loaded as part of the class definition. Objects mainly occupy memory in their instance fields on the heap and fixed object header overhead. Therefore, no matter which interface reference type is used to point to a concrete implementation class instance, the complete method set of this instance only exists one copy in memory and is not repeatedly allocated as the number of objects increases. The reference type only affects compile-time accessibility.

Aug 11, 2025 pm 05:27 PM

Analysis of type compatibility between Java method reference and functional interface

This article analyzes how the Java compiler handles the type compatibility of method references and functional interfaces. Taking FeignException::errorStatus assigning value to the ErrorDecoder interface as an example, it explains how the compiler implicitly converts method references into Lambda expressions that conform to the single abstract method (SAM) signature of the functional interface. This allows the code to compile smoothly even if the declaration type seems to be mismatched, and a deep understanding of this mechanism helps to effectively utilize Java functional programming features.

Aug 11, 2025 pm 05:18 PM

How to use a LinkedHashMap to maintain insertion order in Java

TomaintaininsertionorderinJava,useLinkedHashMap,whichpreservestheorderofkeyinsertionthroughadoubly-linkedlist.1.BasicUsage:InstantiateLinkedHashMapandinsertelements;iterationwillreflectinsertionorder.2.Iteration:Keys,values,andentriesareallreturnedin

Aug 11, 2025 pm 04:59 PM

Verify PBKDF2 hash password using Java

This article details how to use Java to verify hash passwords generated by the PBKDF2 algorithm. The point is how to hash the password entered by the user and compare it securely with the hash value stored in the database to achieve user authentication. Help developers understand and implement secure password verification mechanisms through sample code and clear steps.

Aug 11, 2025 pm 04:51 PM

How to traverse an unknown size matrix in Java

This article aims to help Java beginners understand how to traverse a two-dimensional array (matrix) without knowing the size of the matrix. We will introduce how to use grid.length and grid[0].length to get the number of rows and columns of a matrix, and provide sample code to demonstrate how to safely traverse the matrix and avoid array out-of-bounds exceptions.

Aug 11, 2025 pm 04:39 PM

How to log more information against non-200 HTTP responses

This article aims to provide a method for recording request methods, paths, and response status codes to independent log files for non-200 HTTP responses in Spring Boot applications. By configuring Logback, we can filter logs based on HTTP response status codes and output them to specific log files, which facilitates error checking and monitoring, while avoiding contaminating normal business logs.

Aug 11, 2025 pm 04:36 PM