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Technical Articles

Java

javaTutorial

The correct way to access private variables of parent class using Java subclasses

This article introduces how to call the toString() method of the parent class in Java when a child class needs to access the private variables of the parent class but cannot modify the parent class code through the super.toString() method to indirectly access the private variables of the parent class. In this way, the subclass can be extended and utilized to the parent class information without violating the encapsulation.

Sep 02, 2025 am 10:21 AM

Calculate the Hamming Distance of a String: Java Tutorial

This document details how to calculate the Hamming distance between two strings in Java. The Hanming distance is the number of different characters at the corresponding position between two equal length strings. This article will provide an implementation of the hammingDistance method that takes two strings as input and returns their Hamming distance. If the string length is inconsistent, return -1. In addition, it will also demonstrate how to use this method in the main method, and combine array operations to find the string with the smallest distance from the target string Hamming.

Sep 02, 2025 am 10:15 AM

ZK Combobox Dynamic content loading and closing behavior customization

This article explores how to customize the default shutdown behavior of Combobox in the ZK Framework, especially when dealing with dynamic content such as the "Show More" option. By rewriting the doClick_ method of the client Comboitem component, you can realize that the drop-down list is not closed when a specific option is clicked, allowing users to load and display more data without reopening Combobox, improving the user experience.

Sep 02, 2025 am 10:09 AM

Calculate the Hamming distance of strings in Java: from basic to application

This article aims to explain how to calculate the Hamming distance between strings in Java. First, explain the concept of Hamming distance, and then provide an example of a Java implementation, including handling the case of strings of different lengths. Finally, show how to apply Hamming distance calculation in actual programs and give some precautions.

Sep 02, 2025 am 08:51 AM

Tutorial for splitting a list of strings into words and processing them

This article aims to provide a method of dividing each string in a string list into words and further processing the divided words. We will loop through the list, split each string into a word array using the split() method, and provide example code to show how to operate on these word arrays, such as scrambling order.

Sep 02, 2025 am 08:48 AM

Verify methods called by Executor.execute internal method using Mockito

This article aims to resolve threading issues encountered when using Mockito to verify the internal method calls of Executor.execute. By using SynchronousExecutor and injecting it into the code under test, you can ensure that the code executes synchronously, allowing Mockito to correctly verify method calls.

Sep 02, 2025 am 08:18 AM

Concurrency problem and solution for Sybase stored procedures to generate unique IDs

This article discusses the concurrency problem of duplicate values ??when a stored procedure generates self-increment ID in Sybase database, which cannot be avoided even if the SERIALIZABLE isolation level is set at the application layer. The core reason is the lack of explicit transaction management within stored procedures. The article provides three solutions: adding explicit transactions to stored procedures, optimizing stored procedures as single-state atomic updates, and configuring Sybase table lock granularity to datarows, aiming to ensure the uniqueness and concurrency security of ID generation.

Sep 02, 2025 am 07:48 AM

Tutorial on implementing text file stop word filtering and word frequency statistics in Java

This tutorial explains in detail how to use Java to efficiently process text files, implement stop word filtering and frequency statistics of remaining vocabulary. We will use the Files class of NIO.2 for file reading and writing, combine string operations to remove the specified stop words, and count the word frequency through HashMap, and finally show how to obtain and sort high-frequency vocabulary.

Sep 02, 2025 am 07:45 AM

Java Stream API handles the sum of nested object fields: Taking shopping cart entries as an example

This article explores in-depth how to efficiently aggregate and sum numeric fields in complex nested objects using the Java Stream API. Through a specific case of shopping cart entry, we demonstrate how to extract and accumulate BigDecimal type fee data from multi-level objects, emphasizing the precise calculation of mapToDouble, BigDecimal, and the key considerations for null value judgments combined with annotations when processing fields that may be empty.

Sep 02, 2025 am 06:51 AM

Tutorial on handling time zone issues when sending meeting invitations in Java Mail

This document is intended to help developers correctly handle time zone issues when sending meeting invitations using Java Mail, and avoid meeting time errors in different time zones. We will demonstrate with sample code how to set the start and end times of a meeting invitation and specify the correct time zone to ensure that the meeting time is displayed accurately in the recipient's calendar.

Sep 02, 2025 am 06:42 AM

How to overload a method in Java

MethodoverloadinginJavaallowsmultiplemethodswiththesamenamebutdifferentparameters,achievedby:1.Changingthenumberofparameters,asseenintheCalculatorclasswithaddmethodstakingtwoorthreeintegers;2.Changingthedatatypesofparameters,suchasoneaddmethodaccepti

Sep 02, 2025 am 06:15 AM

What is a ConcurrentHashMap in Java?

ConcurrentHashMapinJavaisathread-safe,high-performancemapimplementationthatallowsconcurrentaccessbymultiplethreadswithoutfullsynchronization,usingtechniqueslikeCASoperationsandbucket-levellockinginJava8 ;itdisallowsnullkeysandvalues,supportsnon-block

Sep 02, 2025 am 05:59 AM

java

In-depth understanding of SLF4J log alignment: Logback-based log formatting tips

As a log facade, SLF4J is controlled by the underlying implementation (such as Spring Boot's default Logback). This article will explore how to use Logback's powerful pattern formatting function to achieve precise alignment of specific elements in log output, improve log readability, and demonstrate how to configure it through sample code to solve the problem of confusing log output.

Sep 02, 2025 am 05:51 AM

The correct way to draw a unique card from a deck of cards (Java)

This article aims to solve the java.lang.StackOverflowError problem that occurs when using recursive functions to draw a unique card from a deck of cards in Java. By analyzing the cause of the error, providing the correct code examples, and explaining in detail how to avoid the error, ensuring that the card drawn is unique every time. This article will help readers understand the correct way to use recursion and how to optimize code for efficiency.

Sep 02, 2025 am 05:48 AM