checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC
		"-//Puppy Crawl//DTD Check Configuration 1.2//EN"
		"http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">
	<module name="SuppressWarningsFilter" />
	<module name="NewlineAtEndOfFile"/>
	<module name="FileLength">
		<property name="max" value="2000"/>
	</module>

	<module name="TreeWalker">
		<module name="SuppressWarningsHolder" />
		<module name="SuppressionCommentFilter">
			<property name="offCommentFormat" value="CHECKSTYLE:OFF"/>
			<property name="onCommentFormat" value="CHECKSTYLE:ON"/>
		</module>

		<module name="SuppressionCommentFilter"/>
		<!-- 注释文档检查
		<module name="JavadocType">
			<property name="allowUnknownTags" value="true"/>
			<message key="javadoc.missing" value="类注释：缺少Javadoc注释。"/>
		</module>-->

		<!-- Checks for imports                              -->
		<!-- See https://checkstyle.org/config_import.html -->
		<module name="AvoidStarImport"/>
		<module name="IllegalImport"/> <!-- defaults to sun.* packages -->
		<module name="RedundantImport"/>
		<module name="UnusedImports">
			<property name="processJavadoc" value="false"/>
		</module>
		<module name="ImportOrder">
			<property name="groups" value="/^java\./,javax,*,org.bigdata"/>
			<property name="ordered" value="true"/>
			<property name="separated" value="true"/>
			<property name="option" value="top"/>
			<property name="sortStaticImportsAlphabetically" value="true"/>
		</module>

		<!-- Checks for Naming Conventions.                  -->
		<!-- See https://checkstyle.org/config_naming.html -->
		<module name="ConstantName"/>
		<module name="LocalFinalVariableName"/>
		<module name="LocalVariableName"/>
		<module name="MemberName"/>
		<!--<module name="MethodName"/>-->
		<module name="PackageName"/>
		<module name="ParameterName"/>
		<module name="StaticVariableName"/>
		<module name="TypeName"/>

		<!-- 长度检查 -->
		<!-- 每行不超过150个字符 -->
		<module name="LineLength">
			<property name="max" value="150" />
		</module>
		<!-- 方法不超过50行 -->
		<module name="MethodLength">
			<property name="tokens" value="METHOD_DEF" />
			<property name="max" value="50" />
			<property name="countEmpty" value="false" />
		</module>
		<!-- 方法的参数个数不超过5个。 并且不对构造方法进行检查-->
		<module name="ParameterNumber">
			<property name="max" value="5" />
			<property name="ignoreOverriddenMethods" value="true"/>
			<property name="tokens" value="METHOD_DEF" />
		</module>

		<!-- Checks for whitespace                               -->
		<!-- See https://checkstyle.org/config_whitespace.html -->
		<module name="EmptyForIteratorPad"/>
		<module name="GenericWhitespace"/>
		<module name="MethodParamPad"/>
		<module name="NoWhitespaceAfter"/>
		<!--<module name="NoWhitespaceBefore"/>-->
		<module name="OperatorWrap"/>
		<module name="ParenPad"/>
		<module name="TypecastParenPad"/>
		<module name="WhitespaceAfter"/>
		<module name="WhitespaceAround"/>

		<!-- Modifier Checks                                    -->
		<!-- See https://checkstyle.org/config_modifiers.html -->
		<module name="ModifierOrder"/>
		<module name="RedundantModifier"/>

		<!-- Checks for blocks. You know, those {}'s         -->
		<!-- See https://checkstyle.org/config_blocks.html -->
		<module name="AvoidNestedBlocks"/>
		<module name="EmptyBlock"/>
		<module name="LeftCurly"/>
		<module name="NeedBraces"/>
		<module name="RightCurly"/>
		<!-- Checks for common coding problems               -->
		<!-- See https://checkstyle.org/config_coding.html -->
		<module name="EmptyStatement"/>
		<module name="EqualsHashCode"/>
		<!-- <module name="HiddenField"/> -->
		<module name="IllegalInstantiation"/>
		<module name="InnerAssignment"/>
		<module name="MagicNumber">
			<property name="ignoreFieldDeclaration" value="true"/>
			<property name="ignoreAnnotation" value="true"/>
		</module>
		<module name="MissingSwitchDefault"/>
		<module name="MultipleVariableDeclarations"/>
		<module name="SimplifyBooleanExpression"/>
		<module name="SimplifyBooleanReturn"/>
		<!-- Checks for class design                         -->
		<!-- See https://checkstyle.org/config_design.html -->
		<!-- <module name="DesignForExtension"/> -->
		<module name="FinalClass"/>
		<module name="InterfaceIsType"/>
		<module name="HideUtilityClassConstructor"/>
		<!-- 检查类成员的可见度 检查类成员的可见性。只有static final 成员是public的
        除非在本检查的protectedAllowed和packagedAllowed属性中进行了设置-->
		<module name="VisibilityModifier">
			<property name="packageAllowed" value="true"/>
			<property name="protectedAllowed" value="true"/>
		</module>

		<!-- Miscellaneous other checks.                   -->
		<!-- See https://checkstyle.org/config_misc.html -->
		<module name="ArrayTypeStyle"/>
		<module name="TodoComment"/>
		<module name="UpperEll"/>

		<!-- Checks for class design                         -->
		<!-- See https://checkstyle.org/config_design.html -->
		<!-- <module name="DesignForExtension"/> -->
		<module name="FinalClass"/>
		<module name="InterfaceIsType"/>
		<module name="HideUtilityClassConstructor"/>
		<!-- 检查类成员的可见度 检查类成员的可见性。只有static final 成员是public的
        除非在本检查的protectedAllowed和packagedAllowed属性中进行了设置-->
		<module name="VisibilityModifier">
			<property name="packageAllowed" value="true"/>
			<property name="protectedAllowed" value="true"/>
		</module>

		<!-- Miscellaneous other checks.                   -->
		<!-- See https://checkstyle.org/config_misc.html -->
		<module name="ArrayTypeStyle"/>
		<module name="TodoComment"/>
		<module name="UpperEll"/>

		<!-- 语法 -->
		<!-- String的比较不能用!= 和 == -->
		<module name="StringLiteralEquality"/>
		<!-- 限制for循环最多嵌套2层 -->
		<module name="NestedForDepth">
			<property name="max" value="2"/>
		</module>
		<!-- if最多嵌套3层 -->
		<module name="NestedIfDepth">
			<property name="max" value="3"/>
		</module>
		<!-- 检查未被注释的main方法,排除以Appllication结尾命名的类 -->
		<module name="UncommentedMain">
			<property name="excludedClasses" value=".*[Application,Test]$"/>
		</module>
		<!-- 禁止使用System.out.println -->
		<module name="Regexp">
			<property name="format" value="System\.out\.println"/>
			<property name="illegalPattern" value="true"/>
			<property name="ignoreComments" value="true"/>
		</module>
		<!--
		<module name="Regexp">
			<property name="format" value="//[^ ]+"/>
			<property name="illegalPattern" value="true"/>
			<property name="message" value="注释//后面必须添加一个空格"/>
		</module>
		-->
		<!-- return个数 3个-->
		<!--<module name="ReturnCount">-->
		<!--<property name="max" value="3"/>-->
		<!--</module>-->
		<!--try catch 异常处理数量 3-->
		<module name="NestedTryDepth ">
			<property name="max" value="3"/>
		</module>
		<!-- clone方法必须调用了super.clone() -->
		<module name="SuperClone" />
		<!-- finalize 必须调用了super.finalize() -->
		<module name="SuperFinalize" />
	</module>
</module>