This repository contains my learning journey and practice programs in Java, covering core Java concepts, Object-Oriented Programming, Data Structures, Algorithms, and problem-solving. I use this ...

An array in Java is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created and cannot be changed.

本文以 cosmos 仓库中 readme-2DArray.md 为主线，结合同一目录下的可运行示例 2d-array.java 与 2d-array-list-java.java ，系统讲解二维数组的定义、声明、初始化、动态创建、遍历输出，并延伸到二维 ArrayList 与常见陷阱。

文章浏览阅读257次。本文详解基于Java Swing实现的轻量级烟花特效，聚焦粒子系统建模、双缓冲渲染优化与物理运动模拟。涵盖粒子实体设计、烟花管理器架构、抗撕裂双缓冲实现、HSV色彩渐变、极坐标爆炸分布等核心技术，并系统分析UI线程卡顿、阶梯位移、跨平台变色等典型渲染问题及其底层解决 ...