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Mastering Java Logging: Best Practices for Effective Application Monitoring

Explore my Amazon books! Follow me on Medium for more insights and support my work. Thank you! Effective Java logging is often overlooked, yet crucial for swift issue resolution. This article shares expert techniques for robust Java application lo

Jan 20, 2025 am 06:04 AM

Using nested annotations for key-value pairs in a custom annotation

introduction In my previous article "Using HashMap in Custom Annotations", I explained how to use HashMap in annotations using enumeration constants. Nested annotations can also be used to map key-value pairs. List of supported types in annotations annotation Two custom annotations are required. The first annotation (such as MapItem) contains a key-value pair, and the second annotation (such as MapItems) contains a list of MapItem annotations. Custom annotation @MapItem The annotation @MapItem represents a single key-value pair. @Target(ElementType.FIELD) public @interface MapItem { St

Jan 20, 2025 am 04:04 AM

'Key Syntax Differences in Object-Oriented Programming: Python vs. Java”

Object-oriented programming: Detailed explanation of classes and objects (Comparison of Python and Java) This article will use Python and Java code examples to compare and explain the concepts of classes and objects, as well as the usage of constructors. 1. Classes and Objects Python: # Student class definition class Student: name = "Momo" #Create object s1 of Student class s1 = Student() print(s1.name) Java: // Student class definition class Student { String na

Jan 20, 2025 am 12:04 AM

Inheritance

Detailed explanation of Java inheritance mechanism: the cornerstone of building object-oriented programs The inheritance mechanism in Java allows an object to inherit all properties and behaviors of its parent object, and is the core concept of object-oriented programming (OOPs). Through inheritance, we can create a new class based on an existing class, reuse the methods and fields of the parent class, and add new methods and fields on this basis. What is inheritance? The Java inheritance mechanism allows one class (subclass or derived class) to inherit the properties and methods of another class (superclass or parent class). Subclasses can access members (fields and methods) of the superclass, enforcing reuse rules, and promoting class hierarchy. Inheritance embodies the "IS-A" relationship, also known as the parent-child relationship. Why use Java inheritance?

Jan 19, 2025 pm 06:08 PM

Leetcode . Online Stock Span

Problem-solving ideas Can I use previously calculated span results? method Save the stock price and its span in an array. When the price of the last day is less than the current price, jump to the date of the last day span. complexity Time complexity: O(n) Space complexity: O(n) code import java.util.ArrayList; class StockSpanner { ArrayList list; public StockSpanner() { list = ne

Jan 19, 2025 pm 04:04 PM

Flyway Migrations in Multi-Module Gradle Projects (Clean Architecture)

Automating Database Migrations in Java with Flyway Database migrations are a crucial aspect of software development, particularly in environments where continuous integration and delivery (CI/CD) are standard practice. As your application grows

Jan 19, 2025 am 08:05 AM

Array index out of out-of-bounds exception

Encountering the dreaded ArrayIndexOutOfBoundsException? This guide explains its cause and provides a practical solution. Even if you haven't experienced this error yet, understanding it will save you debugging headaches down the line. The ArrayInde

Jan 19, 2025 am 06:05 AM

Springboard to functions beyond recursive primitive? Implementation for the Ackermann Peter function

When exploring the springboard technique, I initially used it in simpler situations, with just one recursion – probably a proper subset of primitive recursive functions. However, the need arose to carry out an extremely

Jan 18, 2025 pm 08:09 PM

Understanding Lombok and Its Common Features

Introduction to Lombok: Streamlining Java Development Lombok is a widely-used Java library designed to minimize repetitive code and boost developer efficiency. It employs compile-time annotation processing to automatically generate common methods (g

Jan 18, 2025 pm 08:05 PM

Object-Oriented Concepts: The Foundation of Modern Programming - Part 01

The Evolution from Procedural to Object-Oriented Programming Procedural Programming: The Foundation (1950s-70s) Procedural programming, a foundational approach, tackled problems by sequentially breaking them down into smaller, self-contained procedur

Jan 18, 2025 pm 06:04 PM

How Hibernate ORM Works Under the Hood

Hibernate ORM: A Deep Dive into its Inner Workings Hibernate ORM simplifies database interaction in Java applications by bridging the gap between Java objects and database tables. This abstraction streamlines CRUD (Create, Read, Update, Delete) oper

Jan 18, 2025 am 10:14 AM

Arrays In Java

Detailed explanation of Java arrays: one-dimensional arrays and multi-dimensional arrays Hello everyone?! Today we will talk about arrays in Java. Arrays are used to store multiple values ??in one variable instead of declaring separate variables for each value. There are two types of arrays in Java: one-dimensional arrays and multi-dimensional arrays. An array is an object, so it stores a reference to the data it stores. Arrays can store two types of data: Collection of basic data types collection of objects An array of primitive types stores a collection of values ??that make up the primitive value itself. Object arrays store collections of values, which are actually heap memory addresses or pointers. The members of an array are defined at contiguous memory locations, thus improving access speed. The following code creates a basic data array: publi

Jan 18, 2025 am 06:07 AM

Understanding Merge Sort Algorithm (with Examples in Java)

Merge Sort: A Comprehensive Guide Merge Sort is a highly efficient sorting algorithm frequently employed in various programming languages, either independently or as part of a hybrid approach. Its foundation lies in the Divide and Conquer paradigm:

Jan 18, 2025 am 02:23 AM

Understanding Sorting Algorithms (with Examples in Java)

Sorting arranges list elements in a specific order. For example, we might sort a list in ascending order: This process is accomplished using a sorting algorithm. Various Sorting Algorithms Many sorting algorithms exist. Here are a few examples: B

Jan 18, 2025 am 02:19 AM