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Calculate days, hours, minutes, and seconds between two dates and times in Java

This article describes how to calculate the number of days, hours, minutes, and seconds elapse between a given date and time (formatted in "Wednesday 02-October-2022 11:51:1 PM") and the current date and time using Java. The article explains in detail how to use DateTimeFormatter to parse date and time strings, how to deal with time zone problems in combination with ZoneId, and how to use Duration to calculate time difference.

Aug 21, 2025 pm 01:15 PM

Grade points based on letter grades: Java Tutorial

This article aims to guide readers on how to write a Java program that can calculate and output corresponding grade points based on the letter grades entered by the user. The program converts letter levels to grade points through the qualityPoint method and uses the try-catch block to process invalid inputs to ensure the robustness of the program. This article will introduce the code implementation in detail and provide necessary precautions to help readers understand and apply the program.

Aug 21, 2025 pm 01:09 PM

Maven multi-module project: cross-module resource file access and management

This article aims to solve common problems in accessing resource files across modules in Maven multi-module projects. By exploring the dependency management mechanism of Maven in depth, we will explain how to incorporate resources of one module into the classpath of another module, and use the ClassLoader.getResourceAsStream() method to read these resources safely and efficiently, thereby avoiding manual copying of files and improving project maintainability.

Aug 21, 2025 pm 01:06 PM

Build flexible functions: Use Builder mode to handle functions or floating point parameters

This article describes how to use the Builder pattern to gracefully handle function parameters or floating point parameters, avoid code duplication, and provide a more flexible API design. Through the example code, we show in detail how to build a RangeBuilder class that accepts functions or floating-point numbers as parameters and use them to generate functions for Streams, thereby simplifying the input of dynamic values, especially for scenarios such as creative programming that require flexible parameter configuration.

Aug 21, 2025 pm 01:00 PM

Android development: Implement the automatic button activation after the ProgressBar is loaded

This tutorial details how to automatically enable a button when the progress bar (ProgressBar) completes loading in an Android application. We will configure ProgressBar through XML layout and simulate the loading process using CountDownTimer in Java code, which triggers the enablement of the button after the load is over, ensuring that the user can only proceed with the next step after the data or task is ready.

Aug 21, 2025 pm 12:57 PM

Java Swing: Correctly get the text value of the JRadioButton selected item

This article aims to guide developers on how to correctly obtain the text value of JRadioButton selected items in Java Swing. Calling ButtonGroup.getSelection().toString() directly usually returns meaningless memory addresses. The correct solution is to use JRadioButton's setActionCommand method to associate a custom string for each button, and safely extract the text information of the selected item through the ButtonModel's getActionCommand method to ensure the accuracy of data acquisition.

Aug 21, 2025 pm 12:45 PM

JavaFX: Controls the stacking order of Shape to achieve visual occlusion effect

This article provides an effective solution to the problem of stacking and display of Shape objects in JavaFX applications. When multiple Shape objects overlap, it is crucial to control the order in which they are displayed. This article will introduce how to use the setViewOrder() method to adjust the cascade order of Shape objects to achieve visual occlusion and provide sample code for demonstration. By studying this article, developers can easily solve the problem of stacking and displaying Shape objects in JavaFX applications and improve user experience.

Aug 21, 2025 pm 12:39 PM

Correct configuration and practice of Swagger UI access path in Spring Boot application

This tutorial explains in detail how to properly integrate and configure the Swagger UI, the API documentation tool, in a Spring Boot project, and emphasizes the use of the modern springdoc-openapi-ui library. The article covers the complete process from introducing dependencies, removing legacy configurations to accessing API documents and UI interfaces, and provides code examples and precautions, aiming to help developers efficiently solve common problems such as "No mapping for GET /swagger-ui.html" and improve API development and debugging efficiency.

Aug 21, 2025 pm 12:33 PM

Log4j 1.x Migration to Log4j 2.x FAQs and Solutions

This document is intended to help developers successfully migrate projects from Log4j 1.x to Log4j 2.x. We will focus on addressing XML configuration issues that may be encountered during the migration process, especially the "The prefix "log4j" for element "log4j:configuration" is not bound." error, and provide detailed configuration examples and considerations to ensure a smooth transition.

Aug 21, 2025 am 11:54 AM

Correct posture for using version number comparison in Java: Say goodbye to the dilemma of regular expressions

This article explores how to effectively compare version numbers using Java and avoid complex regular expressions. By customizing the Version class and implementing the Comparable interface, we can parse the version string into an array of integers and make accurate comparisons, solving the problems that regular expressions may encounter when dealing with version comparisons and providing a clearer and easier to maintain solution.

Aug 21, 2025 am 11:51 AM

How to use Comparator to merge the method to find the maximum and minimum values ??of an array

This article aims to introduce how to use the Comparator interface in Java to combine two similar methods that look for array maximum and minimum values ??into a more general method. By passing different Comparator instances, this method can flexibly implement the functions of finding maximum, minimum, and other custom comparison logic, thereby improving code reusability and maintainability.

Aug 21, 2025 am 11:45 AM

Efficient use of Couchbase cache: String Residence Optimization Guide

This article aims to explore how to optimize the memory footprint when storing large numbers of duplicate strings in the Couchbase cache. By customizing the Jackson deserializer, implementing a string resident mechanism similar to Java String Pool, thereby significantly reducing the size of cached documents and improving cache efficiency. This article will provide detailed configuration steps and sample code to help developers achieve efficient string management in Couchbase.

Aug 21, 2025 am 11:42 AM

A practical tutorial on inverting and incrementing characters in strings

This tutorial is intended to guide developers how to use Java to invert strings and increment each character in the string. The article will explain the concept of character ASCII values ??in detail and provide examples of Java code that can be used directly, including implementations of string inversion and character increments. It also covers strategies for handling boundary situations such as 'z' and 'Z' to help you easily master string processing skills.

Aug 21, 2025 am 11:21 AM

Generate titles that accurately express the topic of the article How to exit loop using user input in Java

This article describes how to gracefully exit a for or while loop through user input in a Java program. The focus is on using the BufferedReader class to receive user input and deal with possible IOException exceptions. At the same time, it also briefly mentions best practices for code simplification and type conversion to help developers write more robust and user-friendly programs.

Aug 21, 2025 am 10:33 AM