# Moai Lang Java

> Java programming language patterns, object-oriented design, and enterprise application development. Use when building enterprise applications, Android apps, or large-scale systems.

- Skill: `majiayu000/moai-lang-java-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/moai-lang-java-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/moai-lang-java-3/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/moai-lang-java-3

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# Java Programming Language Skill

## Skill Metadata

| Field | Value |
| ----- | ----- |
| **Skill Name** | moai-lang-java |
| **Version** | 2.0.0 (2025-11-11) |
| **Allowed tools** | Read, Bash, Glob |
| **Auto-load** | On demand when Java patterns detected |
| **Tier** | Language (Foundation) |

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## What It Does

Java programming language patterns, object-oriented design, and enterprise application development.

**Key capabilities**:
- ✅ Object-oriented design patterns
- ✅ Enterprise application architecture
- ✅ JVM optimization
- ✅ Spring framework integration
- ✅ Android development

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## When to Use

- ✅ Building enterprise applications
- ✅ Creating Android apps
- ✅ Developing large-scale systems
- ✅ Implementing microservices

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## Core Java Patterns

### Object-Oriented Design
1. **Design Patterns**: GoF patterns implementation
2. **SOLID Principles**: Clean architecture practices
3. **Inheritance Hierarchies**: Proper class design
4. **Interface Design**: Contract-based programming
5. **Exception Handling**: Robust error management

### Enterprise Development
- **Spring Framework**: Dependency injection and AOP
- **REST APIs**: JAX-RS and Spring Boot
- **Database Integration**: JPA and Hibernate
- **Testing**: JUnit and Mockito patterns
- **Build Systems**: Maven and Gradle

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## Dependencies

- JDK (Java Development Kit)
- Build tools (Maven, Gradle)
- IDE support (IntelliJ, Eclipse)
- Testing frameworks

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## Works Well With

- `moai-domain-backend` (Enterprise patterns)
- `moai-domain-database` (Database integration)
- `moai-essentials-debug` (Java debugging)

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## Changelog

- **v2.0.0** (2025-11-11): Added complete metadata, Java programming patterns
- **v1.0.0** (2025-10-22): Initial Java language support

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**End of Skill** | Updated 2025-11-11