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Technical Articles

Java

javaTutorial

What is the difference between List and Set in Java?

List allows repeating elements and maintaining the insertion order, supports index access, and is suitable for scenarios where order and repetition are required; Set does not allow duplication, and does not guarantee order (except LinkedHashSet and TreeSet), and has no index access, and is suitable for scenarios where uniqueness and quick searches are required.

Aug 14, 2025 pm 12:38 PM

java gather

What are streams in Java 8?

StreamsinJava8arenotdatastructuresbutafunctionalabstractionforprocessingsequencesofelementsfromsourceslikecollectionsorarraysthroughpipelinesofoperations,enablingdeclarative,SQL-likeprocessingusingmethodssuchasfilter,map,andreduce;theydonotstoredatab

Aug 14, 2025 am 11:00 AM

streams java 8

What is the difference between Comparable and Comparator in Java?

Comparable defines natural sorting, and needs to implement the compareTo method and modify the class itself, which is suitable for default sorting; Comparator provides external custom sorting, which is implemented through the compare method, supports multiple sorting rules without modifying the original class, which is more flexible.

Aug 14, 2025 am 10:58 AM

Check if the sorted subarray exists in a larger sorted array: O(log n) Complexity implementation

This article introduces a method to determine whether a sorted subarray of size k exists in a sorted array of size n within the O(max(log n, k)) time complexity. This method is based on binary search to locate the starting element of the subarray and performs subsequent verification, especially when n is much larger than k.

Aug 14, 2025 am 10:48 AM

Implementing word scoring system in Java: Tutorial on file reading and character points calculation

This tutorial is designed to guide readers how to build a word scoring system in Java, which calculates the total score of each word based on the preset alphabetical number rules by reading text files. The article will explain common programming pitfalls in detail and provide a solution for efficient character point mapping using HashMap while covering best practices for file I/O to ensure code robustness and readability.

Aug 13, 2025 pm 01:15 PM

Non-static methods for calling existing JFrame instances in Java: Avoid repeated creation

This article aims to solve the problem of how to call non-static methods in an existing JFrame instance from another class (such as an event listener) in a Java GUI application without creating a new JFrame object. The core solution is to ensure that the event processing logic can correctly interact and update with the main interface components by passing references to existing JFrame instances, thereby avoiding unnecessary repeated interface creation and improving program efficiency and user experience.

Aug 13, 2025 pm 01:06 PM

What is Maven in Java?

MavenisabuildautomationandprojectmanagementtoolforJavathatusesapom.xmlfiletomanagedependencies,plugins,andbuildconfigurations;1)itautomatesdependencymanagementbydownloadingrequiredlibrarieslikeJacksonfromrepositories;2)enforcesastandardizedprojectstr

Aug 13, 2025 pm 01:01 PM

java maven

Run tests with Selenium Grid 4 specified nodes

This article aims to guide beginners on how to configure nodes in Selenium Grid 4 and run tests precisely on specified nodes. By setting custom capabilities, you can control which node the test cases are executed, thus achieving more granular testing environment management and resource allocation. This article will explain in detail how to add custom capabilities to the node configuration file and use these capabilities in the test code to specify the running node.

Aug 13, 2025 pm 01:00 PM

Solutions for pictures that cannot be displayed in Java Swing programs

This article aims to solve the problem that ImageIcon cannot display images correctly in Java Swing programs. By analyzing common errors such as file paths and resource loading methods, a solution based on getClass().getResource() is provided to help developers load and display image resources correctly, thereby avoiding the phenomenon of blue squares replacing images in the program.

Aug 13, 2025 pm 12:57 PM

Mastering Object Relational Mapping (ORM) in Java

Understanding object-relational impedance mismatch is the core of mastering JavaORM, including differences in granularity, inheritance, identification and association; 2. Proficient in JPA and Hibernate, you need to deeply understand mapping annotation and crawling strategies, give priority to LAZY and combine JOINFETCH to optimize queries; 3. Avoid N 1 query problems, reduce unnecessary data loading through BatchSize or DTO projection to improve performance; 4. Correctly manage transactions and sessions, use @Transactional to ensure lazy loading is completed within the session, and use cache reasonably; 5. Follow best practices, such as using warehouse mode, DTO isolation entities, Bean verification and @Version optimistic locking, to ensure that the code is efficient, safe and maintainable.

Aug 13, 2025 pm 12:55 PM

java orm

Exception handling and stream selection strategies in Java Socket communication

In Java Socket programming, network instability often leads to problems such as SocketException, StreamCorruptedException and ClassCastException, especially when using ObjectInputStream/OutputStream to transmit data. This article aims to explore the causes of these common exceptions, emphasize the importance of implementing robust error handling in network communications, and guide developers to select appropriate I/O streams based on data type and complexity, such as prioritizing BufferedReader/BufferedWriter for text data to ensure the continuity and stability of program flows.

Aug 13, 2025 pm 12:51 PM

How to change the state of a boolean variable using void method in Java

This article describes how to use void methods in Java to change the state of a boolean variable, that is, to switch from a closed state to a open state. By creating getter and setter methods, you can implement encapsulation and control of boolean variables to ensure correct management of state. This article will provide detailed code examples and explain how to use these methods to change the state of a Boolean variable.

Aug 13, 2025 pm 12:39 PM

How to Dockerize a Java Spring Boot Application

Build SpringBoot application to generate JAR files and package them with Maven or Gradle commands; 2. Create Dockerfile, based on openjdk:17-jdk-slim image, copy the JAR file and set the startup command; 3. Use the dockerbuild command to build Docker images and tag them; 4. Run containers and map ports through the dockerrun command; 5. Optionally use multi-stage construction to achieve a cleaner and reproducible image; 6. Add .dockerignore files to reduce the construction context; ultimately implement containerization of the application to ensure portability and deployment consistency.

Aug 13, 2025 pm 12:25 PM

Best practices for Java string comparison in Android Studio: Taking password verification as an example

This article aims to explore in-depth common pitfalls and best practices for Java string comparison in Android Studio development. This highlights why the equals() method should be used instead of the == operator for string content comparison in scenarios such as password verification, and provides robust suggestions to avoid null pointer exceptions. In addition, the article will also introduce how to use Lambda expressions, optimize Toast displays, and understand the comparison between CharSequence and String to improve the simplicity and maintainability of the code and help developers write more professional and efficient Android applications.

Aug 13, 2025 pm 12:21 PM