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="FileTabCharacter"/>

    <module name="LineLength">
        <property name="max" value="200"/>
        <property name="ignorePattern"
                  value="^package |^import |https?://|ftp://"/>
    </module>

    <module name="TreeWalker">
        <module name="OuterTypeFilename"/>
        <module name="UnusedImports"/>
        <module name="RedundantImport"/>
        <module name="AvoidNestedBlocks"/>
        <module name="EmptyBlock"/>
        <module name="EqualsHashCode"/>
        <module name="NeedBraces"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround"/>
        <module name="NoWhitespaceBefore"/>
        <module name="NoWhitespaceAfter"/>
        <module name="OneStatementPerLine"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="FallThrough"/>
        <module name="UpperEll"/>
    </module>
</module>