checkstyle.xml

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


<!-- THIS CHECKSYTLE CONFIGURATION IS SIMILAR TO THE ONE USED BY SQUARE INC. IF YOU WANT TO
     CONFIGURE YOUR IDE TO USE THIS CHECKSTYLE TAKE A LOOK AT https://github.com/square/java-code-styles-->


<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://checkstyle.sf.net/config_javadoc.html -->
        <!--module name="JavadocMethod"/-->
        <!--module name="JavadocType"/-->
        <!--module name="JavadocVariable"/-->
        <!--module name="JavadocStyle"/-->


        <!-- Checks for Naming Conventions.                  -->
        <!-- See http://checkstyle.sf.net/config_naming.html -->

        <module name="MethodName" />
        <module name="PackageName" />
        <module name="ParameterName" />
        <module name="TypeName" />
        <module name="ConstantName" />

        <!-- Checks for imports                              -->
        <!-- See http://checkstyle.sf.net/config_import.html -->
        <module name="AvoidStarImport" />
        <module name="IllegalImport" />
        <!-- defaults to sun.* packages -->
        <module name="RedundantImport" />
        <module name="UnusedImports">
            <property name="processJavadoc" value="true" />
        </module>

        <!-- Checks for Size Violations.                    -->
        <!-- See http://checkstyle.sf.net/config_sizes.html -->
        <module name="LineLength">
            <property name="max" value="120" />
        </module>

        <!--module name="ParameterNumber"/-->


        <!-- Checks for whitespace                               -->
        <!-- See 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" />


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


        <!-- Checks for blocks. You know, those {}'s         -->
        <!-- See http://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://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="SimplifyBooleanExpression" />
        <module name="SimplifyBooleanReturn" />

        <!-- Checks for class design                         -->
        <!-- See http://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://checkstyle.sf.net/config_misc.html -->
        <!--module name="ArrayTypeStyle"/-->
        <!--module name="FinalParameters"/-->
        <!--module name="TodoComment"/-->
        <module name="UpperEll" />
    </module>
</module>