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Technical Articles

Java

Output format requirements: Best practices for using this keyword in Java

This article explores how to effectively pass this keyword to Supplier in a Java 8 environment, especially in asynchronous programming scenarios such as CompletableFuture. The article analyzes the different ways of using Lambda expressions and method references and discusses their potential performance impacts, aiming to help developers choose the best solution for their needs, avoid unnecessary resource consumption, and write more efficient and concise code.

Sep 06, 2025 am 10:27 AM

Solution to empty @Autowired field in Spring Boot integration test

This article aims to solve the problem of null pointer exceptions in Spring Boot integration tests when using @Autowired annotation for Repository fields. Typically, this indicates that the test is not running in the Spring context, resulting in dependency injection failure. This article provides detailed troubleshooting and solutions to ensure that integration tests run correctly in the Spring context and successfully inject the required dependencies.

Sep 06, 2025 am 10:24 AM

Activity life cycle management when optimizing screen direction switching in Android applications

This article aims to solve the problem of screen orientation changes in Android applications causing Activity reset, especially when using components such as Azure Maps that need to remain state. By modifying the tags in the AndroidManifest.xml file and adding the android:configChanges="orientation|keyboardHidden|screenSize" attribute, developers can block the default reconstruction behavior of the Activity and instead trigger the onConfigurationChanged() method. This strategy effectively avoids UI state loss and data overloading, thus

Sep 06, 2025 am 10:21 AM

Create a query in Lucene that does not match any document: MatchNoDocsQuery details

In Lucene query logic, MatchNoDocsQuery is the ideal solution when a specific condition is not met, avoiding returning null and requiring an "empty" query that does not match any document. This tutorial will detail how to use MatchNoDocsQuery to elegantly build a query that explicitly does not return any results, thereby improving code robustness and avoiding potential null pointer exceptions.

Sep 06, 2025 am 10:15 AM

Visual tutorial on implementing XNOR logic gate using Java Swing

This tutorial details how to use Java Swing to build a simple graphical user interface (GUI) to visualize the Boolean logic of XNOR logic gates. With JCheckBox as input and a custom JPanel as output display, we will demonstrate how to dynamically update the output color based on the input state and provide an efficient UI update mechanism to avoid common errors.

Sep 06, 2025 am 09:45 AM

Splitting a list of strings into a word array: Java Implementation Guide

This article aims to guide developers on how to split a list of strings containing multiple sentences into an array containing the words in each sentence. We will loop through the list and use the split() method to split each sentence into a word array. In addition, it will be discussed how to randomly sort these word arrays to meet specific needs, such as creating fill-in-the-blank exercises in disrupted order.

Sep 06, 2025 am 09:42 AM

Java programming: Implementing random letter pair generator

This tutorial will explain in detail how to use Java to generate a specified number of random upper and lower case combinations. By using the Math.random() method, we can effectively generate random character indexes within the ASCII range of letters, and then combine them into unique letter pairs. The article will provide clear code examples and detailed explanations to help readers master the principles and practices of random character generation.

Sep 06, 2025 am 09:39 AM

Java substring position judgment: accurate identification of prefix, suffix and infix

This tutorial discusses in detail how to accurately determine the position of a substring in Java, that is, to identify whether it is a prefix, suffix, or infix. The article analyzes common programming misunderstandings and provides a rigorous set of logic and sample code to ensure that substrings can be classified clearly and unambiguously, avoiding incorrect judgments caused by overlapping conditions.

Sep 06, 2025 am 09:33 AM

Calling Java methods using array parameters: a complete guide

This article aims to clearly explain how to correctly pass and use array parameters in Java methods. Through the example code, we will show how to instantiate a class containing array parameters and call the corresponding method to finally obtain the expected calculation result. This article is suitable for beginners in Java and aims to help readers master the basic skills of passing method parameters.

Sep 06, 2025 am 09:30 AM

.class files and binary code in Java: A deep understanding of JVM bytecode

This article aims to clarify the key differences between .class files generated by the Java compiler and traditional binary code. We will dive into the features of .class files as Java Virtual Machine (JVM) bytecode and how it implements the cross-platform capability of "written at once, run everywhere" on different operating systems and CPU architectures. At the same time, compare operating system-specific binary codes such as .exe files to further understand the advantages and working principles of Java bytecode.

Sep 06, 2025 am 09:27 AM

Optimization of multi-parameter object construction in Java: In-depth understanding and application builder pattern

In Java development, when a class contains multiple optional parameters, the traditional constructor pattern can lead to a large number of redundant and difficult to maintain constructor combinations. This article will introduce the Builder Pattern, an efficient creation design pattern that allows clients to build objects in a phased manner, avoids complex constructor overloading, and provides a clearer and more flexible object instantiation mechanism, especially for scenarios with a large number of optional parameters.

Sep 06, 2025 am 09:21 AM

Null value processing and exception throwing strategies for responsive streams in Spring WebFlux

This article explores the challenges posed by handling null values ??in Spring WebFlux responsive programming and provides two robust solutions. According to the Reactive Streams specification, responsive sequences do not allow null elements, so it is not advisable to return null directly in map operations. We will explain in detail how to use flatMap and handle operators to gracefully throw custom exceptions when null values ??are detected to ensure the correctness and stability of the responsive stream.

Sep 06, 2025 am 09:15 AM

Reference behavior and defensive copying practice of array members in Java objects

This article explores the common reference behavior traps in Java when using arrays as object members. When an external array is assigned directly to an array reference inside an object, the two will point to the same piece of data in memory, causing external modifications or internal modifications to the object to affect each other. To avoid this unexpected side effect, the tutorial will explain in detail the impact of Java's "value delivery" mechanism on object references, and provide a solution for defensive copying using Arrays.copyOf() to ensure the independence and encapsulation of the internal state of the object.

Sep 06, 2025 am 09:12 AM

Hibernate @OneToOne Lazy Loading Problems and Solutions in Bidirectional Association

This article deeply explores the problem of delayed load failure in the @OneToOne bidirectional association in Hibernate. By analyzing the problem code, the reason why @OneToOne's default behavior does not match expectations is explained, and two solutions are provided: remove the Passport association in the Person entity, or use the @MapsId annotation. At the same time, for the two usage scenarios of Spring JPA and EntityManager, corresponding code examples are given to help developers better understand and solve this problem.

Sep 06, 2025 am 09:06 AM