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Technical Articles

Java

javaTutorial

How to get the DatePicker value from the selected cell in TableView

This article aims to solve the problem of getting DatePicker values from selected cells in JavaFX TableView. The core is to handle the conversion between the LocalDate type and the String type, ensuring that the date data in the TableView is correctly passed to the DatePicker control. The article will provide two solutions, with code examples and notes, to help developers implement this functionality efficiently.

Aug 13, 2025 am 11:51 AM

Find elements in two ArrayList using linear search

This article describes how to compare two string types ArrayLists using a linear search algorithm in Java to determine if all elements in one list (such as shopping list) exist in another list (such as pantry list). We will explore how to implement this functionality through loop traversal and conditional judgment, and provide an alternative to optimizing search efficiency with HashSet.

Aug 13, 2025 am 11:45 AM

What is NIO (New I/O) in Java?

NIOprovidesamoreefficient,scalablealternativetotraditionalI/Obyusingchannelsandbuffers,enablingnon-blockingoperationsandevent-drivenhandlingviaselectors;1)itdiffersfromtraditionalI/Obybeingbuffer-orientedratherthanstream-oriented;2)supportsnon-blocki

Aug 13, 2025 am 11:38 AM

Java Swing: Solve the problem that images cannot be displayed on buttons

This article aims to solve the problem that images cannot be displayed normally on buttons in Java Swing programs. By adjusting the project structure, using the correct resource path, and ensuring the correct image format, the image display problem can be effectively solved and the user interface experience can be improved. This article will provide detailed steps and sample code to help developers quickly locate and fix related errors.

Aug 13, 2025 am 11:27 AM

Accurate verification of Boolean type value in Java

This article aims to provide a way to accurately verify Boolean type values in Java, ensuring that the input values are only true or false. We will explore how to handle null values, and how to verify the validity of the input without changing the data type, and provide corresponding code examples and precautions to help developers avoid potential errors.

Aug 13, 2025 am 11:24 AM

What is method overriding in Java?

MethodoverridinginJavaallowsasubclasstoprovideaspecificimplementationofamethodalreadydefinedinitsparentclass,requiringinheritance,matchingmethodsignatures,andenablingruntimepolymorphism;itmandatesthesamemethodname,parameters,andreturntype,permitsonly

Aug 13, 2025 am 11:20 AM

Create and populate Shape type array in Java

This article will explain in detail how to create and populate arrays of Shape type in Java. Since Shape itself is an abstract class, we need to use its concrete subclass to populate the array. This article will provide sample code to demonstrate how to use subclasses such as Rectangle, Ellipse2D.Double, and Line2D.Float to create and populate Shape arrays, and discuss related notes.

Aug 13, 2025 am 11:06 AM

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