PMD 5.4.2 发布了，该版本一些提升： A JSON-renderer for PMD which is compatible with CodeClimate. See PR#83. #1360: Provide backwards compatibility for PMD configuration file CPD supports now Swift (see PR#33). java-design/UseVargs: public static void main method is ignored now and so are methods, that are annotated with Override. See PR#79. CLI 改进： CPD: If a complete filename is specified, the language dependent filename filter is not applied. This allows to scan files, that are not using the standard file extension. If a directory is specified, the filename filter is still applied and only those files with the correct file extension of the language are scanned. CPD: If no problems found, an empty report will be output instead of nothing. See also #1481 New command line parameter for PMD: -norulesetcompatibility - this disables the ruleset factory compatibility filter and fails, if e.g. an old rule name is used in the ruleset. See also #1360. This option is also available for the ant task: <noRuleSetCompatibility>true</noRuleSetCompatibility>. PMD是一款采用BSD协议发布的Java程序代码检查工具。该工具可以做到检查Java代码中是否含有未使用的变量、是否含有空的抓取块、是否含有不必要的对象等。该软件功能强大，扫描效率高，是Java程序员debug的好帮手。 PMD支持的编辑器包括： JDeveloper、 Eclipse、JEdit、JBuilder、BlueJ、CodeGuide、NetBeans/Sun Java Studio Enterprise/Creator、IntelliJ IDEA、TextPad、Maven、Ant,、Gel、JCreator和Emacs。 下载地址：https://github.com/pmd/pmd/releases/tag/pmd_releases/5.4.2 PMD 5.4.2 发布，Java 程序代码检查工具下载地址
