Sharing common backend development knowledge.
This article explains the fundamentals of I/O in Unix and Java, covering the distinction between user and kernel space, the five Unix I/O models, the evolution from select/poll to epoll/kqueue, and how modern network frameworks like Reactor and Proactor leverage these mechanisms for high‑performance networking.
This article provides a comprehensive guide to Java I/O streams, covering the distinction between node (low‑level) and processing (high‑level) streams, byte versus character streams, their superclasses, common implementations, buffering techniques, object serialization, and practical code examples for reading and writing data.
This guide walks you through using DeepSeek R1 via the official website or popular third‑party cloud services, compares free token quotas, explains token accounting, and provides step‑by‑step instructions for configuring API access and AI clients such as Chatbox, Cherry Studio, and Dify.
This step‑by‑step guide shows non‑technical users how to install Ollama, pull the desired DeepSeek‑R1 model version, run it from the terminal, and optionally connect the free Chatbox desktop client for a visual chat interface, all without external network dependencies.
This article explains Java polymorphism by illustrating inheritance hierarchies, runtime method binding, and the differences between static and dynamic dispatch, while providing concrete code examples that demonstrate how method overriding, field access, and down‑casting behave in practice.
This article explains how Java developers can reuse code without duplication by employing composition, inheritance, and delegation, details the syntax and initialization rules for each, and clarifies the use of the final keyword for data, methods, parameters, and classes.
This article explains Java's access control hierarchy—public, protected, package‑private, and private—detailing package naming conventions, the role of the package keyword, how each modifier affects class members and classes, and includes practical code examples.
This article explains Java constructors, the importance of providing a no‑arg constructor, method overloading rules and type promotion, the use of the this and static keywords, memory cleanup strategies, garbage‑collector algorithms, JIT compilation, member initialization order, and enum usage with clear code examples.
This article provides a concise yet comprehensive guide to core Java concepts, covering access modifiers, aggregation versus inheritance, polymorphism, single-root inheritance, object lifecycle, method signatures, and operator nuances, helping developers build a solid foundation for backend development.
