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Technical Articles

Java

javaTutorial

Parallel Processing in Java using Parallel Streams

Parallel flows are processed in Java through the Fork/Join framework, which is suitable for large data sets and CPU-intensive tasks. 1. When using parallel flow, you need to ensure that the data source is large, the operation is independent and there is no shared state; 2. Avoid using small data sets, I/O operations or scenes with side effects; 3. Avoid stateful Lambda expressions, and priority is to use collect instead of forEach; 4. Reduce operations must ensure the combination law and statelessness; 5. Reduce the overhead of packing/unboxing, and prioritize the use of primitive streams such as IntStream; 6. The thread resources can be isolated through custom ForkJoinPool; 7. When performing optimization, the JVM should be warmed up, avoid synchronization and consider using unorder

Aug 13, 2025 am 11:02 AM

java parallel processing

Data loss in Java methods: In-depth understanding of parameter passing and return value mechanisms

This tutorial aims to solve common problems of data loss after Java methods are executed. The core is to understand Java's parameter passing mechanism - "value passing", especially when object references are used as parameters, the reassignment of referenced variables within the method will not affect the external original reference. The article will explain the causes of data loss in detail through specific examples and provide an effective solution to pass data as a method return value, ensuring that data created or modified within the method can be correctly accessed and used outside the method.

Aug 13, 2025 am 10:57 AM

CMake and Temurin JDK 8 JNI Integration Configuration Guide in macOS Environment

This tutorial is intended to solve the problem that CMake fails to correctly detect JNI (Java Native Interface) components when using Temurin JDK 8 on macOS system. The article elaborates on the common reasons why the FindJNI module fails, and provides an effective solution to ensure that JNI is correctly recognized and linked by explicitly setting critical path variables (such as JAVA_HOME, JAVA_INCLUDE_PATH, etc.) in CMake commands, helping developers to successfully build local libraries that rely on JNI.

Aug 13, 2025 am 10:51 AM

Search for parent nodes in general tree: Implementation based on breadth-first traversal

This article details how to find the parent node of a specified node through the Broadly First Traversal (BFS) algorithm in a general tree data structure. We will explore the definition of a general tree node and provide an efficient iterative implementation method. This method uses a queue to traverse the tree layer by layer, check whether the child nodes of each node match the target key value, and if it matches, the current node will be returned as the parent node. The article contains sample code, algorithm analysis and usage precautions, aiming to help readers master the key technologies for node relationship search in general trees.

Aug 13, 2025 am 10:39 AM

Statistics the number of unique characters in a string: Optimize time complexity

This article aims to explore how to efficiently count the number of unique characters in a string. Although the theoretical lower limit of time complexity is O(n), by rationally selecting the data structure, memory usage can be optimized and actual performance can be improved. This article will analyze common methods based on HashSet, introduce optimization strategies for using fixed-size arrays, and finally discuss their applicable scenarios and limitations.

Aug 13, 2025 am 10:30 AM

Grade points based on letter grades: Java Implementation Guide

This article aims to guide readers on how to write a Java program that can receive letter levels entered by users and calculate corresponding grade points based on the levels. The program implements the level-to-grade point conversion through the qualityPoint method, and uses the try-catch block to process invalid inputs to ensure the robustness of the program. This article will introduce the code implementation in detail and provide correct modified examples to help readers understand and apply.

Aug 13, 2025 am 10:27 AM

Selenium Grid 4: A complete guide to specifying nodes to run tests

This article aims to help readers understand how to specify specific nodes in Selenium Grid 4 to run tests. By configuring the node's custom abilities and specifying these abilities in the test code, you can ensure that the test is executed on the expected node, enabling more precise control of the test environment.

Aug 13, 2025 am 10:12 AM

Java programming: Implementing text file word letter scoring system

This tutorial explains in detail how to read text files in Java and calculate the total score of each word based on the preset letter scoring rules. The article will point out common programming misunderstandings and provide a clear and efficient solution to achieve word scoring by traversing each character in a word and accumulating its corresponding scores, and ultimately outputting the word and its total score.

Aug 13, 2025 am 09:33 AM

Understanding Java ClassLoaders and Reflection API

ClassLoader is responsible for loading class bytecode. Java provides three-layer class loaders, Bootstrap, Platform (formerly Extension), and Application. It follows the parent delegation model, that is, first delegate the parent loader to try loading, and only load it by itself when the parent cannot complete, ensuring the security of the core class and avoiding duplicate loading; 2. Custom loading can be achieved by inheriting ClassLoader and rewriting findClass(), which is used for hot deployment, plug-in systems and other scenarios; 3. Reflection API allows the runtime to dynamically obtain class structures and operate fields, methods and constructors, such as obtaining classes through Class.forName() and newIns

Aug 13, 2025 am 09:32 AM

Fault-tolerant processing in Java parallel method calls: Ensure independent execution and error logging

This article discusses how to avoid interrupting the entire processing process due to a single task exception when executing parallel method calls in Java. By leveraging CompletableFuture and custom result encapsulation mechanism, even if some parallel tasks fail, other tasks can be ensured to continue execution, and the execution results and exception information of all tasks can be collected uniformly to achieve robust parallel processing.

Aug 13, 2025 am 09:21 AM

Verify exact True and False values using Java Boolean types

This article aims to provide a way to verify that user input is an exact true or false value using the Boolean type in Java. We will explore how to handle null values and how to ensure that only valid boolean values can pass verification while avoiding changing the data type of the input parameters. With sample code and detailed explanations, you will learn how to write robust and reliable Boolean verification logic.

Aug 13, 2025 am 09:18 AM

How to get the operating system name in Java

To get the operating system name in Java, you should use System.getProperty("os.name"); 1. This method returns the operating system name string running by the JVM; 2. Common return values include Windows 10, Linux, MacOSX, etc.; 3. The results can be normalized through toLowerCase() and contains() to adapt to different variants; 4. You can also obtain more system information in combination with os.arch, os.version and other attributes; 5. This method does not require external libraries or special permissions, and is cross-platform and reliable, which is the recommended standard practice.

Aug 13, 2025 am 09:17 AM

How to log details of non-200 HTTP responses

This article describes how to log more detailed information in a standalone log file for non-200 HTTP responses, including request methods, paths, and response status codes. We will explore using Logback configuration to achieve this, ensuring that this additional information is logged only when an error occurs, thus avoiding contaminating regular logs.

Aug 13, 2025 am 09:12 AM

Get DatePicker value from the selected cell of TableView

This article aims to solve the problem in JavaFX how to get date values from the selected row of TableView and set them back to the DatePicker control. There are two methods mainly introduced: one is to define the column type of TableView as LocalDate, and directly obtain the LocalDate object; the other is to parse the obtained string value into a LocalDate object, and then set it to the DatePicker. Through this article, developers can more effectively handle data interactions between TableView and DatePicker.

Aug 13, 2025 am 09:06 AM