checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">

<module name="Checker">

    <property name="charset" value="UTF-8"/>

    <module name="FileLength"/>
    <module name="NewlineAtEndOfFile"/>
    <module name="SuppressWarningsFilter"/>
    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </module>

    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Line has trailing spaces."/>
    </module>

    <module name="RegexpSingleline">
        <property name="format" value="^\s*(for|if)[^ ]\("/>
        <property name="message" value="Space needed before opening parenthesis."/>
    </module>

    <module name="RegexpSingleline">
        <property name="format" value="^\s*for \(.*?([^ ]:|:[^ ])"/>
        <property name="message" value="Space needed around ':' character."/>
    </module>

    <module name="TreeWalker">

        <!-- http://checkstyle.sf.net/config_import.html -->
        <module name="AvoidStarImport"/>
        <module name="IllegalImport"/>
        <module name="RedundantImport"/>
        <module name="UnusedImports"/>

        <!-- http://checkstyle.sf.net/config_naming.html -->
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>

        <!-- http://checkstyle.sf.net/config_whitespace.html -->
        <module name="GenericWhitespace"/>
        <module name="EmptyForIteratorPad"/>
        <module name="MethodParamPad"/>
        <module name="NoWhitespaceAfter"/>
        <module name="NoWhitespaceBefore"/>
        <module name="OperatorWrap"/>
        <module name="ParenPad"/>
        <module name="TypecastParenPad"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround"/>

        <!-- http://checkstyle.sf.net/config_blocks.html -->
        <module name="LeftCurly"/>
        <module name="RightCurly"/>
        <module name="NeedBraces">
            <property name="allowSingleLineStatement" value="true"/>
        </module>

        <!-- http://checkstyle.sf.net/config_modifier.html -->
        <module name="RedundantModifier"/>

        <!-- http://checkstyle.sf.net/config_coding.html -->
        <module name="CovariantEquals"/>
        <module name="EmptyStatement"/>
        <module name="IllegalInstantiation"/>
        <module name="MissingSwitchDefault"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>

        <!-- http://checkstyle.sf.net/config_misc.html -->
        <module name="ArrayTypeStyle"/>
        <module name="UpperEll"/>
        <module name="SuppressWarningsHolder"/>
        <module name="Indentation">
            <property name="basicOffset" value="4"/>
            <property name="braceAdjustment" value="0"/>
            <property name="caseIndent" value="4"/>
            <property name="throwsIndent" value="4"/>
            <property name="lineWrappingIndentation" value="4"/>
            <property name="arrayInitIndent" value="4"/>
            <property name="forceStrictCondition" value="false"/>
        </module>

    </module>

</module>