checkstyle.xml

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

<module name="Checker">
  <!--module name="NewlineAtEndOfFile"/-->
  <module name="FileLength"/>
  <module name="FileTabCharacter"/>

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

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

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

  <module name="TreeWalker">
    <!-- Checks for Javadoc comments.                     -->
    <!-- See http:https://checkstyle.sf.net/config_javadoc.html -->
    <!--module name="JavadocMethod"/-->
    <!--module name="JavadocType"/-->
    <!--module name="JavadocVariable"/-->
    <!--module name="JavadocStyle"/-->


    <!-- Checks for Naming Conventions.                  -->
    <!-- See http:https://checkstyle.sf.net/config_naming.html -->
    <!--<module name="ConstantName"/>-->
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName">
      <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
    </module>
    <module name="PackageName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName">
      <property name="format" value="^[A-Z][a-zA-Z0-9_]*$"/>
    </module>


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


    <!-- Checks for Size Violations.                    -->
    <!-- See http:https://checkstyle.sf.net/config_sizes.html -->
    <!--module name="LineLength"-->
      <!--property name="max" value="100"/-->
    <!--/module-->
    <module name="MethodLength"/>
    <module name="ParameterNumber"/>


    <!-- Checks for whitespace                               -->
    <!-- See http:https://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"/>


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


    <!-- Checks for blocks. You know, those {}'s         -->
    <!-- See http:https://checkstyle.sf.net/config_blocks.html -->
    <!--module name="AvoidNestedBlocks"/-->
    <!--module name="EmptyBlock"/-->
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>


    <!-- Checks for common coding problems               -->
    <!-- See http:https://checkstyle.sf.net/config_coding.html -->
    <module name="AvoidInlineConditionals"/>
    <module name="CovariantEquals"/>
    <module name="EmptyStatement"/>
    <module name="EqualsAvoidNull"/>
    <module name="EqualsHashCode"/>
    <!--module name="HiddenField"/-->
    <module name="IllegalInstantiation"/>
    <!--<module name="InnerAssignment"/>-->
    <!--module name="MagicNumber"/-->
    <module name="MissingSwitchDefault"/>
    <!--<module name="RedundantThrows"/>-->
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>

    <!-- Checks for class design                         -->
    <!-- See http:https://checkstyle.sf.net/config_design.html -->
    <!--module name="DesignForExtension"/-->
    <!--module name="FinalClass"/-->
    <module name="HideUtilityClassConstructor"/>
    <!--module name="InterfaceIsType"/-->
    <module name="VisibilityModifier"/>


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