#安装插件步骤：
1.打开settings
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2.选择plugins
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3.点击"Browse repositories"
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4.搜索对应内插件，点击"install"
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到这里我们默认已经完成了4个插件的安装。
checkstyle,PMD,findbugs都可以直接使用，但VsiualVM需要配合客户端来完成配置和使用。
下面先去官网下载VisualVM的客户端。
VisualVM官网链接
配置连接过程如下
打开settings->Other Settings
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点击"Browse"
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在打开的页面内选择已经解压好的文件夹中的bin文件夹内的"VisualVM.exe"
##checkstyle使用
1.安装完之后，我们打开checkstyles，点击绿色箭头
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2.出现提示"No rules file has been configured"，这是提醒我们没有为其指定配置文件，它不知道应该按照什么标准来评判代码的风格
3.解决办法：打开settings->Other Settings->Checkstyle ，选定默认的配置文件。
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4.回到步骤一的页面，重新运行checkstyles
，得到检查错误。通过点击不同的感叹号可以选定观察不同优先级的错误。
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FindBugs的使用
1.在代码编辑页面点击右键，根据检查对象的不同选择不同选项。
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2.得到检查结果
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##PMD的使用
1.在代码编辑区点击右键，根据项目不同选择不同的检查规则集
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2.在下方按照不同规则集显示出不同位置的错误，通过规则名就可以得知代码的问题类型
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##VisualVM的使用
1.在代码编辑区点击右键，如图选择
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2.这时会触发VisualVM客户端，可以观察项目内的性能使用情况
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