tip-cq-kaizhou/01-style/checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">

<module name="Checker">
    <!-- 编码 -->
    <property name="charset" value="UTF-8"/>

    <!-- 严重性，默认警告 -->
    <property name="severity" value="warning"/>

    <!-- 检查一下3中结尾的文件 -->
    <property name="fileExtensions" value="java, properties, xml"/>

    <!-- Excludes all 'module-info.java' files              -->
    <!-- See https://checkstyle.org/config_filefilters.html -->
    <module name="BeforeExecutionExclusionFileFilter">
        <property name="fileNamePattern" value="module\-info\.java$"/>
    </module>

    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.org/config_whitespace.html -->
    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </module>

    <!-- 检查文件是否以一个空行结束 -->
    <module name="NewlineAtEndOfFile"/>

    <!-- 文件长度不超过1500行 -->
    <module name="FileLength">
        <property name="max" value="1500"/>
    </module>

    <!-- 长度检查 -->
    <module name="LineLength">
        <!-- 只检查java文件 -->
        <property name="fileExtensions" value="java"/>
        <!-- 每行不超过120个字符 -->
        <property name="max" value="120" />
        <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
    </module>

    <!-- 每个java文件一个语法树 -->
    <module name="TreeWalker">
        <module name="OuterTypeFilename"/>
        <!-- 非法token -->
        <module name="IllegalTokenText">
            <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
            <property name="format"
                      value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
            <property name="message"
                      value="Consider using special escape sequence instead of octal value or Unicode escaped value."/>
        </module>
        <!--避免转义的 Unicode 字符-->
        <module name="AvoidEscapedUnicodeCharacters">
            <property name="allowEscapesForControlCharacters" value="true"/>
            <property name="allowByTailComment" value="true"/>
            <property name="allowNonPrintableEscapes" value="true"/>
        </module>
        <!-- import检查-->
        <!-- 避免使用* -->
        <module name="AvoidStarImport">
            <property name="excludes" value="java.io,java.net,java.lang.Math"/>
            <!-- 实例；import java.util.*;.-->
            <property name="allowClassImports" value="false"/>
            <!-- 实例 ；import static org.junit.Assert.*;-->
            <property name="allowStaticMemberImports" value="true"/>
        </module>
        <!-- 一个顶级类检查 -->
        <module name="OneTopLevelClass"/>
        <!-- 未换行检查 -->
        <module name="NoLineWrap">
            <property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT"/>
        </module>

        <!-- 检查是否有空代码块 -->
        <module name="EmptyBlock">
            <property name="option" value="TEXT"/>
            <property name="tokens"
                      value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
        </module>
        <!-- 检查代码块是否缺失{} -->
        <module name="NeedBraces">
            <property name="tokens"
                      value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_IF, LITERAL_WHILE"/>
        </module>

        <!-- 检查左大括号位置 -->
        <module name="LeftCurly">
            <property name="tokens"
                      value="ANNOTATION_DEF, CLASS_DEF, CTOR_DEF, ENUM_CONSTANT_DEF, ENUM_DEF,
                    INTERFACE_DEF, LAMBDA, LITERAL_CASE, LITERAL_CATCH, LITERAL_DEFAULT,
                    LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF,
                    LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, METHOD_DEF,
                    OBJBLOCK, STATIC_INIT, RECORD_DEF, COMPACT_CTOR_DEF"/>
        </module>

        <!-- 检查右大括号位置 -->
        <module name="RightCurly">
            <property name="id" value="RightCurlySame"/>
            <property name="tokens"
                      value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE,
                    LITERAL_DO"/>
        </module>
        <module name="RightCurly">
            <property name="id" value="RightCurlyAlone"/>
            <property name="option" value="alone"/>
            <property name="tokens"
                      value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
                    INSTANCE_INIT, ANNOTATION_DEF, ENUM_DEF, INTERFACE_DEF, RECORD_DEF,
                    COMPACT_CTOR_DEF"/>
        </module>

        <module name="SuppressionXpathSingleFilter">
            <!-- suppresion is required till https://github.com/checkstyle/checkstyle/issues/7541 -->
            <property name="id" value="RightCurlyAlone"/>
            <property name="query" value="//RCURLY[parent::SLIST[count(./*)=1]
                                     or preceding-sibling::*[last()][self::LCURLY]]"/>
        </module>
        <!-- 检查分隔符是否在空白之后 -->
        <module name="WhitespaceAfter">
            <property name="tokens"
                      value="COMMA, SEMI, TYPECAST, LITERAL_IF, LITERAL_ELSE,
                    LITERAL_WHILE, LITERAL_DO, LITERAL_FOR, DO_WHILE"/>
        </module>

        <!-- 检查分隔符周围是否有空白 -->
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyLambdas" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
            <property name="allowEmptyTypes" value="true"/>
            <property name="allowEmptyLoops" value="true"/>
            <property name="ignoreEnhancedForColon" value="false"/>
            <property name="tokens"
                      value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR,
                    BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAMBDA, LAND,
                    LCURLY, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY,
                    LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SWITCH, LITERAL_SYNCHRONIZED,
                    LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN,
                    NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, RCURLY, SL, SLIST, SL_ASSIGN, SR,
                    SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT, TYPE_EXTENSION_AND"/>
            <message key="ws.notFollowed"
                     value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
            <message key="ws.notPreceded"
                     value="WhitespaceAround: ''{0}'' is not preceded with whitespace."/>
        </module>
        <module name="OneStatementPerLine"/>
        <module name="MultipleVariableDeclarations"/>
        <!-- 检查数组类型定义的样式 -->
        <module name="ArrayTypeStyle"/>
        <!-- 检查switch语句是否有default -->
        <module name="MissingSwitchDefault"/>
        <module name="FallThrough"/>
        <!-- 检查long型定义是否有大写的“L” -->
        <module name="UpperEll"/>
        <!-- 检查修饰符的顺序是否遵照java语言规范，默认public、protected、private、abstract、static、final、transient、volatile、synchronized、native、strictfp -->
        <module name="ModifierOrder"/>
        <module name="EmptyLineSeparator">
            <property name="tokens"
                      value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                    STATIC_INIT, INSTANCE_INIT, METHOD_DEF, CTOR_DEF, VARIABLE_DEF, RECORD_DEF,
                    COMPACT_CTOR_DEF"/>
            <property name="allowNoEmptyLineBetweenFields" value="true"/>
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapDot"/>
            <property name="tokens" value="DOT"/>
            <property name="option" value="nl"/>
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapComma"/>
            <property name="tokens" value="COMMA"/>
            <property name="option" value="EOL"/>
        </module>
        <module name="SeparatorWrap">
            <!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/259 -->
            <property name="id" value="SeparatorWrapEllipsis"/>
            <property name="tokens" value="ELLIPSIS"/>
            <property name="option" value="EOL"/>
        </module>
        <module name="SeparatorWrap">
            <!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/258 -->
            <property name="id" value="SeparatorWrapArrayDeclarator"/>
            <property name="tokens" value="ARRAY_DECLARATOR"/>
            <property name="option" value="EOL"/>
        </module>
        <module name="SeparatorWrap">
            <property name="id" value="SeparatorWrapMethodRef"/>
            <property name="tokens" value="METHOD_REF"/>
            <property name="option" value="nl"/>
        </module>
        <!-- 包名的检查（只允许小写字母），默认^[a-z]+(\.[a-zA-Z_][a-zA-Z_0-9_]*)*$ -->
        <module name="PackageName">
            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$" />
            <message key="name.invalidPattern" value="包名 ''{0}'' 要符合 ''{1}''格式."/>
        </module>
        <!-- Class或Interface名检查，默认^[A-Z][a-zA-Z0-9]*$-->
        <module name="TypeName">
            <property name="severity" value="warning"/>
            <message key="name.invalidPattern" value="名称 ''{0}'' 要符合 ''{1}''格式."/>
        </module>
        <!-- 非static型变量的检查 -->
        <module name="MemberName" >
            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
            <message key="name.invalidPattern"
                     value="Member name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <!-- 方法的参数名 -->
        <module name="ParameterName" >
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <!-- lambada中参数名 -->
        <module name="LambdaParameterName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <!-- catch参数名 -->
        <module name="CatchParameterName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <!-- 局部的非final型的变量，包括catch中的参数的检查 -->
        <module name="LocalVariableName" >
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Local variable name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="PatternVariableName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Pattern variable name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="ClassTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
            <message key="name.invalidPattern"
                     value="Class type name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="RecordComponentName">
            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
            <message key="name.invalidPattern"
                     value="Record component name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="RecordTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
            <message key="name.invalidPattern"
                     value="Record type name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="MethodTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
            <message key="name.invalidPattern"
                     value="Method type name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="InterfaceTypeParameterName">
            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
            <message key="name.invalidPattern"
                     value="Interface type name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="NoFinalizer"/>
        <module name="GenericWhitespace">
            <message key="ws.followed"
                     value="GenericWhitespace ''{0}'' is followed by whitespace."/>
            <message key="ws.preceded"
                     value="GenericWhitespace ''{0}'' is preceded with whitespace."/>
            <message key="ws.illegalFollow"
                     value="GenericWhitespace ''{0}'' should followed by whitespace."/>
            <message key="ws.notPreceded"
                     value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
        </module>
        <module name="Indentation">
            <!-- 基础缩进4个 -->
            <property name="basicOffset" value="4"/>
            <property name="braceAdjustment" value="2"/>
            <property name="caseIndent" value="2"/>
            <property name="throwsIndent" value="4"/>
            <property name="lineWrappingIndentation" value="4"/>
            <property name="arrayInitIndent" value="2"/>
        </module>
        <module name="AbbreviationAsWordInName">
            <property name="ignoreFinal" value="false"/>
            <property name="allowedAbbreviationLength" value="0"/>
            <property name="tokens"
                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, ANNOTATION_DEF, ANNOTATION_FIELD_DEF,
                    PARAMETER_DEF, VARIABLE_DEF, METHOD_DEF, PATTERN_VARIABLE_DEF, RECORD_DEF,
                    RECORD_COMPONENT_DEF"/>
        </module>
        <module name="NoWhitespaceBeforeCaseDefaultColon"/>
        <module name="OverloadMethodsDeclarationOrder"/>
        <module name="VariableDeclarationUsageDistance"/>
        <module name="CustomImportOrder">
            <property name="sortImportsInGroupAlphabetically" value="true"/>
            <property name="separateLineBetweenGroups" value="true"/>
            <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
            <property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
        </module>
        <!-- 方法名后跟左圆括号"(" -->
        <module name="MethodParamPad" >
            <property name="tokens"
                      value="CTOR_DEF, LITERAL_NEW, METHOD_CALL, METHOD_DEF,
                    SUPER_CTOR_CALL, ENUM_CONSTANT_DEF, RECORD_DEF"/>
        </module>
        <!-- 检查在某个特定关键字之前应保留空格 -->
        <module name="NoWhitespaceBefore">
            <property name="tokens"
                      value="COMMA, SEMI, POST_INC, POST_DEC, DOT,
                    LABELED_STAT, METHOD_REF"/>
            <property name="allowLineBreaks" value="true"/>
        </module>
        <!-- 圆括号空白 -->
        <module name="ParenPad">
            <property name="tokens"
                      value="ANNOTATION, ANNOTATION_FIELD_DEF, CTOR_CALL, CTOR_DEF, DOT, ENUM_CONSTANT_DEF,
                    EXPR, LITERAL_CATCH, LITERAL_DO, LITERAL_FOR, LITERAL_IF, LITERAL_NEW,
                    LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_WHILE, METHOD_CALL,
                    METHOD_DEF, QUESTION, RESOURCE_SPECIFICATION, SUPER_CTOR_CALL, LAMBDA,
                    RECORD_DEF"/>
        </module>
        <!-- 操作符换行策略检查 -->
        <module name="OperatorWrap">
            <property name="option" value="NL"/>
            <property name="tokens"
                      value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
                    LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF,
                    TYPE_EXTENSION_AND "/>
        </module>
        <module name="AnnotationLocation">
            <property name="id" value="AnnotationLocationMostCases"/>
            <property name="tokens"
                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF,
                      RECORD_DEF, COMPACT_CTOR_DEF"/>
        </module>
        <module name="AnnotationLocation">
            <property name="id" value="AnnotationLocationVariables"/>
            <property name="tokens" value="VARIABLE_DEF"/>
            <property name="allowSamelineMultipleAnnotations" value="true"/>
        </module>
        <module name="NonEmptyAtclauseDescription"/>
        <module name="InvalidJavadocPosition"/>
        <module name="JavadocTagContinuationIndentation"/>
        <module name="SummaryJavadoc">
            <property name="forbiddenSummaryFragments"
                      value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )"/>
        </module>
        <module name="JavadocParagraph"/>
        <module name="RequireEmptyLineBeforeBlockTagGroup"/>
        <module name="AtclauseOrder">
            <property name="tagOrder" value="@param, @return, @throws, @deprecated"/>
            <property name="target"
                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/>
        </module>
        <module name="JavadocMethod">
            <property name="accessModifiers" value="public"/>
            <property name="allowMissingParamTags" value="true"/>
            <property name="allowMissingReturnTag" value="true"/>
            <property name="allowedAnnotations" value="Override, Test"/>
            <property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF, COMPACT_CTOR_DEF"/>
        </module>
        <module name="MissingJavadocMethod">
            <property name="scope" value="public"/>
            <property name="minLineCount" value="2"/>
            <property name="allowedAnnotations" value="Override, Test"/>
            <property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF,
                                   COMPACT_CTOR_DEF"/>
        </module>
        <module name="MissingJavadocType">
            <property name="scope" value="protected"/>
            <property name="tokens"
                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
                      RECORD_DEF, ANNOTATION_DEF"/>
            <property name="excludeScope" value="nothing"/>
        </module>
        <!-- 方法名的检查 -->
        <module name="MethodName" >
            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
            <message key="name.invalidPattern"
                     value="Method name ''{0}'' must match pattern ''{1}''."/>
        </module>
        <module name="SingleLineJavadoc"/>
        <module name="EmptyCatchBlock">
            <property name="exceptionVariableName" value="expected"/>
        </module>
        <module name="CommentsIndentation">
            <property name="tokens" value="SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN"/>
        </module>
        <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
        <module name="SuppressionXpathFilter">
            <property name="file" value="${org.checkstyle.google.suppressionxpathfilter.config}"
                      default="checkstyle-xpath-suppressions.xml" />
            <property name="optional" value="true"/>
        </module>

        <!-- 检查是否从非法的包中导入了类 -->
        <module name="IllegalImport"/>
        <!-- 检查是否导入了多余的包 -->
        <module name="RedundantImport"/>
        <!-- 没用的import检查，比如：1.没有被用到2.重复的3.import java.lang的4.import 与该类在同一个package的 -->
        <module name="UnusedImports" />
        <!-- 注释检查 -->
        <!-- 检查方法和构造函数的javadoc -->
        <module name="JavadocType">
            <property name="allowUnknownTags" value="true"/>
            <message key="javadoc.missing" value="类注释：缺少Javadoc注释。"/>
        </module>

        <!-- 命名检查 -->
        <!-- 局部的final变量，包括catch中的参数的检查 -->
        <module name="LocalFinalVariableName" />
        <!-- 仅仅是static型的变量（不包括static final型）的检查 -->
        <module name="StaticVariableName" />
        <!-- 常量名的检查（只允许大写），默认^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$ -->
        <module name="ConstantName" />

        <!-- 方法不超过50行 -->
        <module name="MethodLength">
            <property name="tokens" value="METHOD_DEF" />
            <property name="max" value="50" />
        </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>

        <!-- 空格检查-->

        <!-- 在类型转换时，不允许左圆括号右边有空格，也不允许与右圆括号左边有空格 -->
        <module name="TypecastParenPad" />
        <!-- 检查在某个特定关键字之后应保留空格 -->
        <module name="NoWhitespaceAfter"/>

        <!-- 修饰符检查 -->

        <!-- 检查接口和annotation中是否有多余修饰符，如接口方法不必使用public -->
        <module name="RedundantModifier"/>

        <!-- 代码块检查 -->
        <!-- 检查是否有嵌套代码块 -->
        <module name="AvoidNestedBlocks"/>

        <!-- 代码检查 -->
        <!-- 检查空的代码段 -->
        <module name="EmptyStatement"/>
        <!-- 检查在重写了equals方法后是否重写了hashCode方法 -->
        <module name="EqualsHashCode"/>
        <!-- 检查局部变量或参数是否隐藏了类中的变量 -->
        <module name="HiddenField">
            <property name="tokens" value="VARIABLE_DEF"/>
        </module>
        <!-- 检查是否使用工厂方法实例化 -->
        <module name="IllegalInstantiation"/>
        <!-- 检查子表达式中是否有赋值操作 -->
        <module name="InnerAssignment"/>
        <!-- 检查是否有"魔术"数字 -->
        <module name="MagicNumber">
            <property name="ignoreNumbers" value="0, 1"/>
            <property name="ignoreAnnotation" value="true"/>
        </module>

        <!-- 检查是否有过度复杂的布尔表达式 -->
        <module name="SimplifyBooleanExpression"/>
        <!-- 检查是否有过于复杂的布尔返回代码段 -->
        <module name="SimplifyBooleanReturn"/>

        <!-- 类设计检查 -->
        <!-- 检查类是否为扩展设计l -->
        <!-- 检查只有private构造函数的类是否声明为final -->
        <module name="FinalClass"/>
        <!-- 检查工具类是否有putblic的构造器 -->
        <module name="HideUtilityClassConstructor"/>
        <!-- 检查接口是否仅定义类型 -->
        <module name="InterfaceIsType"/>
        <!-- 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>

        <!-- 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$"/>
        </module>
        <!-- 禁止使用System.out.println -->
        <module name="Regexp">
            <property name="format" value="System\.out\.println"/>
            <property name="illegalPattern" value="true"/>
        </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>