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Java Tutorial for Drawing Only Cards from a Deck of Cards: Avoid StackOverflowError

This article aims to solve the java.lang.StackOverflowError problem that may occur when using recursive functions to draw a unique card from a deck of cards in Java. By analyzing the causes of the error, we provide improved code examples and explain in detail how to properly initialize the deck, avoid infinite recursion, and ensure that each card drawn is unique. At the same time, non-recursive alternatives are also discussed to improve the efficiency and readability of the code.

Sep 05, 2025 am 02:54 AM

Check whether the number of occurrences of two words in the string is equal (no loop method)

This article introduces how to use the regular expression characteristics of Java 9 to efficiently determine whether the number of times the two words "cat" and "dog" appear in a string is equal without using loops. We will use the Pattern and Matcher classes, as well as the Matcher.results().count() method to achieve a simple and high-performance solution.

Sep 05, 2025 am 02:12 AM

How to use SAP HANA database in Quarkus

This article aims to guide developers on how to connect and use SAP HANA databases in the Quarkus framework. Although Quarkus does not explicitly list support for SAP HANA, since the Hibernate ORM framework itself supports SAP HANA, Quarkus can smoothly connect and operate the SAP HANA database in JVM mode. This article will introduce the necessary configuration and precautions to help developers successfully integrate SAP HANA into Quarkus applications.

Sep 05, 2025 am 02:00 AM

Extract text content of complex web pages with Selenium and advanced XPath accurately

This tutorial explores in detail how to solve the challenge of not getting specific text content when using Selenium for Web automation. The article deeply analyzes the strategies to accurately identify and extract non-standard text through DOM structures and advanced XPath expressions (including text node selection), and provides practical examples of using JavaScriptExecutor to perform XPath acquisition text nodes, aiming to help developers more efficiently handle text extraction requirements for complex page elements.

Sep 05, 2025 am 01:24 AM

Troubleshooting and resolving @Autowired injection failure in Spring Boot unit test

This article aims to solve the problem that the dependency injection fails to cause NullPointerException when using the @Autowired annotation in Spring Boot unit tests. By analyzing common causes and providing detailed troubleshooting and solutions, helping developers ensure that unit tests run correctly in the Spring context, enabling effective dependency injection.

Sep 05, 2025 am 12:09 AM

Optimizing Java code with a single loop: a strategy to replace multiple loops

This article aims to help developers optimize Java code, especially when encountering the need to traverse the same dataset multiple times to find different types of data. We will explore how to replace multiple loops with single loops and flag variables, thereby improving code efficiency and readability, and provide multiple optimization strategies, including the use of boolean flags, arrays, and helper classes, as well as performance considerations.

Sep 04, 2025 pm 01:00 PM

Thymeleaf Dynamic table rendering: Best practices for adding action buttons to each row of data

This tutorial aims to solve common repetitive rendering problems in Spring Boot and Thymeleaf templates when rendering data lists loops and adding independent operation buttons to each row of data. By building a single data model with all the necessary information and using Thymeleaf's th:each directive for one-time iteration, we will show how to efficiently and correctly generate corresponding display content and action forms for each row of data in the table, ensuring that each action button is only associated with the current row data.

Sep 04, 2025 pm 12:57 PM

Adding custom Token authorization for specific endpoints in Spring OAuth2 resource server

This article describes how to implement custom Token authorization for specific endpoints in Spring OAuth2 resource server. Flexible and secure access control policies can be implemented by leveraging JWT's private statement and Keycloak's mapper functionality, as well as a custom AbstractAuthenticationToken implementation. The article provides an access control scheme based on subscription data and discusses how to use client credential flow to authenticate trusted clients.

Sep 04, 2025 pm 12:45 PM

Solve Java array out-of-bounds exception: Dynamic programming of maze path count

This article aims to help developers understand and resolve common ArrayIndexOutOfBoundsException in Java. Through a dynamic programming, we can solve the specific case of maze path counting problems, and analyze the causes of exceptions in detail, and provide modified code examples, as well as effective ways to avoid such errors, especially when dealing with recursive and dynamic programming problems, how to correctly perform array index access and boundary condition judgment.

Sep 04, 2025 pm 12:36 PM

Use generics to solve the problem of List in Pair's inaccessible problem

This article describes the problem that you may not be able to access the size() method or element of the List when using the Pair class in the javatuples library. By using generics in a loop to clarify the type of List in Pair, this problem can be effectively solved and ensure that the function of List is used normally.

Sep 04, 2025 pm 12:33 PM

The trap of object comparison in Java generics: Why conditional statements fail and the correct use of equals() method

This article explores in depth why conditional statements fail when using the == operator to compare objects instead of primitive types. By analyzing the essential differences between the == and .equals() methods, the article provides a clear set of solutions and emphasizes the key practices of correctly comparing object values ??in generic code to ensure the accuracy of program logic.

Sep 04, 2025 pm 12:21 PM

Efficiently search for objects in ArrayList in Java

This article describes how to search for specific objects in ArrayList in Java, focusing on understanding the limitations of the contains() method and provides a custom search scheme based on loops. With sample code, we show in detail how to find the target object in an ArrayList based on the object's properties (such as product name) and provide relevant considerations.

Sep 04, 2025 pm 12:18 PM

Java methods for combining the average value of rows and columns of two-dimensional arrays

This article aims to guide developers how to combine two Java methods that calculate the average of rows and columns of two-dimensional arrays into one method and return a string containing the rows and columns of the highest average. The article will introduce methods to solve the "unreachable statement" error, and provide example code to create tuples using Java Record to return multiple values, while also discussing better algorithm ideas.

Sep 04, 2025 pm 12:15 PM

The shortest time required to complete a task: a scanning line-based algorithm

This paper introduces an effective method to solve task scheduling problems based on scanning line algorithm. The problem involves multiple tasks with start time, end time and required processing time, and the goal is to find the shortest total time required to complete all tasks. This article will explore the principles and implementation steps of this algorithm in depth, and provide detailed Java code examples to help readers understand and apply the algorithm to solve practical problems.

Sep 04, 2025 pm 12:09 PM