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Technical Articles

Java

javaTutorial

what are the different types of inner classes in java

Java has four internal classes: member internal classes, static nested classes, local internal classes and anonymous internal classes. The member internal classes are non-static and need to be created through external class instances, which can access all members of the external class including private members; static nested classes are static and do not rely on external class instances, and can only access static members of the external class; local internal classes are defined in methods or code blocks, and can only access final or effectively final variables within the scope; anonymous internal classes have no name, and are used to temporarily implement interfaces or inheritance classes. They are often used for function interface implementation before event processing or functional programming. Since Java8, they are mostly replaced by lambda expressions; which internal class is chosen depends on whether they need to access external instances and scope scope

Aug 24, 2025 am 08:04 AM

Search and array return practice of prime numbers in specified range in Java

This tutorial details how to efficiently find all prime numbers in a specified range in Java and collect the results into an integer array to return. The article covers prime number judgment methods, dynamic storage of results using ArrayList, and key technologies for converting lists into arrays using Java Stream API, and emphasizes best practices for code structure and output to ensure that core logic is separated from output display.

Aug 24, 2025 am 08:00 AM

Solve the MySQL data retrieval null pointer exception in Spring Boot JPA

This article aims to help developers solve the NullPointerException issue encountered when retrieving data from a MySQL database using Spring Boot JPA. By analyzing entity relationship mapping, Repository queries, and potential configuration errors, this article provides a complete set of troubleshooting and problem solving solutions, with code examples and precautions to ensure the correctness and stability of data retrieval.

Aug 24, 2025 am 07:54 AM

What is the difference between JDK, JRE, and JVM in Java?

JVMistheruntimeenginethatexecutesJavabytecodeandisplatform-specific.2.JREincludestheJVMandcorelibrariesneededtorunJavaapplicationsbutlacksdevelopmenttools.3.JDKcontainstheJREandadditionaldevelopmenttoolslikejavacandjdb,makingitessentialforwritingandc

Aug 24, 2025 am 07:40 AM

Common reasons and solutions for Android Dialog not to be turned off

This article provides a common solution to the problem that Dialog cannot be closed normally in Android development. By analyzing the timing of Dialog creation and destruction and scope issues, we explain how to correctly display and close custom Dialogs, and give suggestions for optimizing Dialog code to ensure that Dialog works as expected.

Aug 24, 2025 am 07:30 AM

Oracle SQL date addition: Avoid implicit conversion traps and correct practices

When performing date addition operations in Oracle databases, if you encounter year calculation errors (such as 2082 becomes 1982), it is usually caused by implicit date conversion and NLS_DATE_FORMAT settings of the session (especially the RR and RRRR format models). This article will explore the reasons for this issue in depth and demonstrate its impact through sample code, ultimately providing best practices for safe and accurate date addition using direct date arithmetic and TRUNC functions, avoid unnecessary format conversions, and ensure the correctness of date calculations.

Aug 24, 2025 am 07:21 AM

Judge right triangles in Java: Efficiently process array side lengths

This article aims to explore how to efficiently determine whether a triangle is a right triangle in Java. We will focus on how to use the Pythagorean theorem to verify whether it is true based on the given three side lengths, especially without modifying the original array, cleverly identify the hypotenuse and calculate the sum of squares of the remaining two right-angle edges. The article will provide clear solutions and sample code and discuss key considerations such as floating point comparisons.

Aug 24, 2025 am 07:00 AM

Find numbers with the same end numbers: Java Tutorial

This article aims to guide developers how to write a method in Java that takes an array of integers as input and returns an array of numbers with the same beginning and ending numbers. We will explore how to convert integers into strings, compare the beginning and end characters of the string, eventually returning an array of numbers that meet the criteria, and avoid repeated additions.

Aug 24, 2025 am 06:30 AM

How to use collections like List, Set, and Map in Java

When using List, when you need to maintain the insertion order, access elements through indexes, or allow repetitions, the commonly used implementations include ArrayList and LinkedList; 2. When using Set, when you need to avoid duplicate elements, quickly find or maintain uniqueness, the commonly used implementations include HashSet, LinkedHashSet and TreeSet; 3. When using Map, when you need to store key-value pairs, quickly find or ensure the uniqueness of keys, the commonly used implementations include HashMap, LinkedHashMap and TreeMap; the appropriate collection type should be selected according to the order, performance and thread safety requirements, and combined with generics and correct rewrite equals and hashCode methods to ensure type safety and positive

Aug 24, 2025 am 06:10 AM

data structure java collection

Print method name and return value using reflection in Java

This article discusses how to implement the requirement of printing Java method names and their return values ??without modifying existing classes and methods. By deeply analyzing the Java reflection API, we will learn how to dynamically obtain method objects, call methods and obtain their names, and finally implement a custom output format like "Method Name = Return Value", and discuss applicable scenarios and precautions for reflection to help readers understand and master this advanced feature.

Aug 24, 2025 am 06:03 AM

Java reflection: dynamically obtain and print method name and return value

This article will explore in-depth how to dynamically obtain and print the name of the method and its execution results through the Java reflection API without modifying existing classes and methods. We will explain in detail why direct calls cannot meet the needs and provide reflection-based solutions, including sample code, error handling, and considerations and performance considerations when using reflection.

Aug 24, 2025 am 05:39 AM

Tutorial on ISBN-10 formatting and verification code generation in Java

This tutorial details how to format 9-digit numeric input into a standard ISBN-10 format in Java, including calculating weighted checkcodes and inserting them correctly, while handling the special case of checkcodes as 'X', and implementing an accurate output structure through String.substring() and System.out.printf().

Aug 24, 2025 am 05:36 AM

Quarkus Integration of SAP HANA Database: Feasibility and Precautions

This article discusses the integration scheme between the Quarkus framework and SAP HANA database. In JVM mode, due to the built-in support of Hibernate ORM for SAP HANA, Quarkus can seamlessly connect and operate SAP HANA databases, and Panache can also be used normally. However, if you need to support SAP HANA in Quarkus Native Image, you need to ensure that the JDBC drivers provided by SAP are natively compatible.

Aug 24, 2025 am 05:18 AM

SLF4J log output alignment: Logback mode modifier depth analysis

As the Java log facade, SLF4J's log output format is not controlled by itself, but depends on the underlying log implementation framework. In Spring Boot applications, Logback is used by default. This article will explore Logback's pattern modifiers, especially width and fill options, to guide developers how to accurately control the log output format, realize requirements such as separator alignment, and improve log readability.

Aug 24, 2025 am 04:54 AM