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This article explains the Chain of Responsibility design pattern, defines its three core roles, compares external and internal composition, demonstrates a lead‑filtering use case with Java and Spring code, and discusses benefits, drawbacks, and differences from the Strategy pattern.
The article explains the Flyweight design pattern, shows how a surge of 30 KB country objects caused memory pressure in a marketing service, and demonstrates a Java implementation with Flyweight, FlyweightFactory, and related code, while comparing it to Singleton and caching approaches.
The article explains how Git merge and rebase work in typical development workflows, compares their effects on commit history, shows when each command is appropriate, warns against rebasing public branches, and offers practical naming conventions for parallel version development.
This article explains why MyBatis-Plus saveBatch does not perform true batch inserts, shows how to enable JDBC rewriteBatchedStatements, creates a custom SQL injector with InsertBatchSomeColumn, implements batch splitting in a service layer, and presents benchmark results that demonstrate a several‑second speedup for inserting tens of thousands of rows.
This article provides a thorough walkthrough of tcpdump, covering installation on Ubuntu, essential command‑line options, practical filtering techniques, logical expressions, examples for saving and reading capture files, and how to combine tcpdump with Wireshark for deeper packet analysis.
The article investigates IntelliJ IDEA's suggestion to replace StringBuilder with the '+' operator, showing that for simple concatenations the compiled code is identical and performance comparable, while in loops '+' becomes inefficient and StringBuilder remains preferable.
The article examines how companies like Jiumu Wang and Xikadegao use training and Tencent Cloud to boost performance, outlines three development approaches for a WeChat mini‑program store, and details the various user entry points such as search, nearby listings, QR codes, and third‑party platform features.
This article introduces MyBatis-Plus, an enhancement layer for MyBatis, and walks through its core features—non‑intrusive CRUD, Lambda queries, primary‑key strategies, automatic field filling, optimistic locking, pagination, logical delete, performance analysis, condition builders, and a code generator—providing complete code examples and configuration steps for Spring Boot integration.
This article demonstrates how to use Java's Optional class—through concrete examples of ofNullable, map, filter, and orElse—to safely handle potentially null objects and collections, thereby preventing NullPointerExceptions in production code.
This article dissects Java's HashMap by first explaining the collection framework's design goals—generality, scalability, performance, interoperability, readability, and thread safety—then walks through the core source code of HashMap (hash, put, resize, get, remove, treeify, etc.), illustrates LRU cache implementation, and finally offers practical usage tips, performance considerations, and version‑specific changes up to JDK 9.
