Class NoArrayTrailingCommaCheck

java.lang.Object
com.puppycrawl.tools.checkstyle.api.AutomaticBean
com.puppycrawl.tools.checkstyle.api.AbstractViolationReporter
com.puppycrawl.tools.checkstyle.api.AbstractCheck
com.puppycrawl.tools.checkstyle.checks.coding.NoArrayTrailingCommaCheck
All Implemented Interfaces:
Configurable, Contextualizable
public class NoArrayTrailingCommaCheck extends AbstractCheck

Checks that array initialization do not contain a trailing comma. Rationale: JLS allows trailing commas in arrays and enumerations, but does not allow them in other locations. To unify the coding style, the use of trailing commas should be prohibited. 

int[] foo = new int[] {
  1,
  2
};

The check demands that there should not be any comma after the last element of an array. 

String[] foo = new String[] {
  "FOO",
  "BAR", //violation
}

To configure the check: 

<module name="NoArrayTrailingComma"/>

Which results in the following violations: 

String[] foo1 = {
  "FOO", // OK
  "BAR", // violation
};
String[] foo2 = { "FOO", "BAR", }; // violation
String[] foo3 = {
  "FOO", // OK
  "BAR" // OK
};
String[] foo4 = { "FOO", "BAR" }; // OK

Parent is com.puppycrawl.tools.checkstyle.TreeWalker

Violation Message Keys:

  • no.array.trailing.comma
Since:
8.28

  • Field Details

    • MSG_KEY

      public static final String MSG_KEY
      A key is pointing to the warning message text in "messages.properties" file.
      See Also:

  • Constructor Details

    • NoArrayTrailingCommaCheck

      public NoArrayTrailingCommaCheck()

  • Method Details

    • getDefaultTokens

      public int[] getDefaultTokens()
      Description copied from class: AbstractCheck
      Returns the default token a check is interested in. Only used if the configuration for a check does not define the tokens.
      Specified by:
      getDefaultTokens in class AbstractCheck
      Returns:
      the default tokens
      See Also:

    • getAcceptableTokens

      public int[] getAcceptableTokens()
      Description copied from class: AbstractCheck
      The configurable token set. Used to protect Checks against malicious users who specify an unacceptable token set in the configuration file. The default implementation returns the check's default tokens.
      Specified by:
      getAcceptableTokens in class AbstractCheck
      Returns:
      the token set this check is designed for.
      See Also:

    • getRequiredTokens

      public int[] getRequiredTokens()
      Description copied from class: AbstractCheck
      The tokens that this check must be registered for.
      Specified by:
      getRequiredTokens in class AbstractCheck
      Returns:
      the token set this must be registered for.
      See Also:

    • visitToken

      public void visitToken(DetailAST arrayInit)
      Description copied from class: AbstractCheck
      Called to process a token.
      Overrides:
      visitToken in class AbstractCheck
      Parameters:
      arrayInit - the token to process