java-coding-style

Layer 2 (Coding style) for Java. Daily decisions without opening SKILL.md: - 4 spaces (never tabs); K&R braces; always braces for if/for/while (no single-line). - NO wildcard imports (import x.*;). NO // comment for structural blocks — use /** */. - Every public class/method has Javadoc with @author/@date/@param/@return. - Custom utility class: public final class + private ctor + all methods static. NO business imports. - Discovery-first: prefer cn.hutool / commons / existing *Util before writing a new helper. Open SKILL.md when deciding: In-Memory JOIN generic helper signature, Cursor Batching skeleton for large datasets, Javadoc template details.