P3c

P3C

最新版本：黄山版（2022.2.3发布）

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Preface

We are pleased to present Alibaba Java Coding Guidelines which consolidates the best programming practices over the years from Alibaba Group's technical teams. A vast number of Java programming teams impose demanding requirements on code quality across projects as we encourage reuse and better understanding of each other's programs. We have seen many programming problems in the past. For example, defective database table structures and index designs may cause software architecture flaws and performance risks. Another example is confusing code structures being difficult to maintain. Furthermore, vulnerable code without authentication is prone to hackers’ attacks. To address these kinds of problems, we developed this document for Java developers at Alibaba.

For more information please refer the *Alibaba Java Coding Guidelines*:

• 中文版: 直接下载上方的PDF文件（黄山版）
• English Version: Alibaba Java Coding Guidelines

Introduction

The project consists of 3 parts:

• PMD implementations
• IntelliJ IDEA plugin
• Eclipse plugin

Rules

Forty-nine rules are realized based on PMD, please refer the P3C-PMD documentation for more detailed information. Four rules are implemented within IDE plugins (IDEA and Eclipse) as follows:

• [Mandatory] Using a deprecated class or method is prohibited.
  Note: For example, decode(String source, String encode) should be used instead of the deprecated method decode(String encodeStr). Once an interface has been deprecated, the interface provider has the obligation to provide a new one. At the same time, client programmers have the obligation to check out what