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Space retention strategy in Java Caesar password encryption

This tutorial details how to correctly handle and retain spaces in messages when implementing Caesar password encryption in Java. By analyzing common errors in skipping space characters in the original code, we provide an accurate code modification scheme to ensure the encrypted text is structured intact, and discuss other key considerations in the implementation of Caesar's cipher, aiming to help developers build more robust encryption tools.

Aug 27, 2025 am 11:24 AM

Tutorial on character pattern generation based on user input in Java

This tutorial details how to generate a specific character pattern in Java based on the number of lines entered by the user. This pattern requires that i characters be printed on the i-th line and '' or '-' according to the parity of i. Through clear logic analysis, core algorithm explanation and complete Java code examples, the article guides readers to efficiently implement this function using nested loops and modulo operations.

Aug 27, 2025 am 11:18 AM

Dynamic loading Spring Beans: Environment-based conditional configuration

This article explores how to dynamically load different bean implementations based on the runtime environment in Spring applications. By using @Conditional annotation and customize the Condition, you can decide which bean to load based on environment properties such as region and profile. This article provides a specific example showing how Spring can be configured to selectively inject different service implementations in different environments, enabling flexible functional customization.

Aug 27, 2025 am 11:09 AM

In-depth understanding and practice: How to implement conversion between different return types in the Java service layer

This article aims to solve common type conversion problems in Java service layer, especially in Spring Boot applications, when the type returned by the service method is inconsistent with the type expected by the controller. We will explore how to convert one data transfer object (DTO) to another through a custom mapper (Mapper), even if there is no direct inheritance relationship between them, ensuring type safety and code clarity, avoiding the use of generic Objects as return types.

Aug 27, 2025 am 10:54 AM

Quarkus Integration SAP HANA Database: JVM Mode and Native Mirroring Considerations

Quarkus supports access to SAP HANA databases in JVM mode through its underlying Hibernate ORM framework. This means that developers can use modules such as standard JDBC drivers and Panache to operate data. However, for Native Image mode, its compatibility depends on whether the SAP HANA JDBC driver supports GraalVM native compilation, and you may need to contact SAP for official support.

Aug 27, 2025 am 10:15 AM

How to save dynamically created CheckBox status in Android

This article aims to help developers solve the problem of state saving of CheckBox dynamically created in Android applications. By leveraging Shared Preferences, we can effectively store the selected state of CheckBox, ensuring that the status of CheckBox can be correctly restored when the user re-enters the application or page, thus providing a better user experience. This article will provide detailed steps and sample code to guide you through the implementation of state saving.

Aug 27, 2025 am 10:12 AM

Alternatives to access DynamoDB using Spring JdbcTemplate

This article aims to help developers find alternatives to access DynamoDB using Spring JdbcTemplate. Since DynamoDB is based on the HTTP protocol, connections are short connections, which are different from long connection characteristics of JDBC, it is impossible to use JdbcTemplate directly. This article will explore viable alternatives and guide developers to retrieve data from DynamoDB and stream it to the Controller layer through code examples and considerations.

Aug 27, 2025 am 09:54 AM

Detailed explanation and solution for obtaining NULL value problems in JSP Session attributes

This article aims to solve the problem of returning NULL values ??when using session.getAttribute() in JSP. We will explore the scope concepts in JSP in depth, including page scope, request scope, session scope and application scope, and provide solutions to share data between different browser sessions using application scope. At the same time, we provide detailed code examples and considerations to help developers better understand and apply scope mechanisms in JSP.

Aug 27, 2025 am 09:45 AM

The correct way to pass environment variables using Qodana in GitHub Actions

This article describes how to correctly pass environment variables to Qodana scans when running Qodana code quality checks using GitHub Actions. Especially for projects that require access to a private Maven repository, we explain in detail how to configure environment variables through the args parameter to avoid building failures due to missing credentials, and provide a modified YAML configuration example.

Aug 27, 2025 am 09:42 AM

Use the JSON Simple library to efficiently parse JSON objects and extract data

This tutorial details how to parse JSON strings and extract specific data from them using Java's JSON Simple library. We will learn how to use JSONParser to convert JSON strings to JSONObject, and accurately obtain the required values ??through key names. At the same time, we will discuss common errors and evasion methods to ensure the smooth and efficient data extraction process.

Aug 27, 2025 am 09:33 AM

Calculate the percentage of words in input strings in Java

This article aims to guide Java beginners to calculate the percentage of strings that meet certain criteria in a set of strings entered by users (for example, words that only contain letters, words that start with capital letters). The article will explain the implementation ideas in detail and provide complete sample code to help readers understand how to use regular expressions to perform string matching and statistics, and finally calculate the required percentage.

Aug 27, 2025 am 09:18 AM

Get Flink aggregation results in Spring Boot: Challenges and strategies for unbounded data sources

This article explores the challenges of getting Flink aggregation results through APIs in Spring Boot applications, especially when using unbounded data sources. Due to the persistence of unbounded streams, it is not feasible to directly return the final aggregation result in the API response. The tutorial will explain strategies for converting data sources into bounded streams, such as by specifying the start and end offset of Kafka to enable real-time or quasi-real-time aggregated result query. At the same time, the article will also provide alternatives, such as using external storage or asynchronous notifications to deal with data query requirements in unbounded flow scenarios.

Aug 27, 2025 am 08:57 AM

Use if-else statement to implement segmented charging algorithm in Java

This article describes how to implement a segmented charging algorithm using the multi-branch if-else statement in Java. The algorithm charges different service fees according to the amount of the check. The article provides detailed code examples and explains the logic and precautions of the code to help readers understand and master the implementation of the algorithm.

Aug 27, 2025 am 08:36 AM

Understand Java string combinations and: Avoid null value traps and efficient practices

This article discusses the common null value problems when merging two string arrays in Java. By analyzing the wrong loop index logic, reveal the reasons for the null value at the end of the array. The article provides two effective solutions, including loop-based correction methods and more advanced API usage tips, aiming to help developers implement combinations correctly and efficiently, avoiding common runtime errors.

Aug 27, 2025 am 08:30 AM