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Design Patterns Serie — Structural Chapter: Proxy Pattern

Design patterns: efficient solutions for common software development challenges. These pre-built solutions prevent "reinventing the wheel," offering answers to frequently recurring problems. However, they aren't one-size-fits-all; develop

Jan 21, 2025 am 04:06 AM

Understanding the QuickSort Algorithm: Divide and Conquer

In the world of computer science, QuickSort stands out as one of the most efficient and widely used sorting algorithms. Its remarkable speed in sorting large data sets is due to its "Split to Split" strategy.

Jan 21, 2025 am 02:18 AM

Anonymous classes in Java

Anonymous classes in Java are unnamed classes, ideal for defining and instantiating implementations of classes or interfaces in-place, without the need for additional files. Its single-use nature prevents its reuse. Unlike the classes

Jan 20, 2025 pm 10:33 PM

Keyword:Abstract-Extends,Interface-Implements

Java abstract Keyword The abstract keyword is used to achieve abstraction in Java. It is a non-access modifier which is used to create abstract class and method. The role of an abstract class is to contain abstract methods. However, it may also con

Jan 20, 2025 pm 10:20 PM

Understanding Generics in Java: A Shopping Cart Example with Custom Classes

Java generics are essential for writing type-safe, reusable code. They enable the creation of classes, methods, and interfaces that can handle various data types, enhancing code robustness and flexibility. This article illustrates generics using a s

Jan 20, 2025 pm 10:14 PM

What is the null literal and how can it be used in Java applications?

NullPointerExceptions: A common Java pitfall. Let's explore the null literal and its uses in Java programming. Feel free to add your insights in the comments! In Java, null signifies the absence of a value or a reference that doesn't point to any o

Jan 20, 2025 pm 10:11 PM

Compression algorithms in Parquet Java

Apache Parquet is a columnar storage format targeted at analytical workloads, but it can be used to store any type of structured data, addressing a variety of use cases. One of its most notable features is the ability to efficiently compress data using different compression techniques at both stages of the processing process. This reduces storage costs and improves read performance. This article explains Parquet's file compression in Java, provides usage examples, and analyzes its performance. compression technology Unlike traditional row-based storage formats, Parquet uses a columnar approach, allowing the use of more specific and efficient compression techniques based on locality and value redundancy of the same type of data. Parquet is written in binary format

Jan 20, 2025 pm 06:04 PM

Tomcat Architecture Series-verview & Basic Concepts

A Deep Dive into Tomcat Architecture: A Comprehensive Guide ? introduction Apache Tomcat is one of the most popular Java web servers and servlet containers, powering millions of web applications around the world. This article will provide a comprehensive overview of Tomcat's architecture to help developers understand its inner workings. Table of contents What is Tomcat? Architecture overview core components Request processing flow Key Features best practices What is Tomcat? 1.1 Brief history First released in 1999, Tomcat has evolved significantly over the years, with the latest stable version being To

Jan 20, 2025 pm 12:07 PM

Passing Properties in Java

Java Property Passing Mechanisms: A Comprehensive Guide Java's parameter-passing mechanism is crucial for developers. This guide explores the various ways properties are passed in Java, impacting data manipulation within methods and classes. Java emp

Jan 20, 2025 am 06:06 AM

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