NoWhitespaceAfter

Since Checkstyle 3.0

Description

Checks that there is no whitespace after a token. More specifically, it checks that it is not followed by whitespace, or (if linebreaks are allowed) all characters on the line after are whitespace. To forbid linebreaks after a token, set property allowLineBreaks to false.

The check processes ARRAY_DECLARATOR and INDEX_OP tokens specially from other tokens. Actually it is checked that there is no whitespace before these tokens, not after them. Space after the ANNOTATIONS before ARRAY_DECLARATOR and INDEX_OP will be ignored.

If the annotation is between the type and the array, like char @NotNull [] param, the check will skip validation for spaces.

Note: This check processes the LITERAL_SYNCHRONIZED token only when it appears as a part of a synchronized statement, i.e. synchronized(this) {}.

Properties

name	description	type	default value	since
allowLineBreaks	Control whether whitespace is allowed if the token is at a linebreak.	boolean	`true`	3.0
tokens	tokens to check	subset of tokens ARRAY_INIT , AT , INC , DEC , UNARY_MINUS , UNARY_PLUS , BNOT , LNOT , DOT , TYPECAST , ARRAY_DECLARATOR , INDEX_OP , LITERAL_SYNCHRONIZED , METHOD_REF .	ARRAY_INIT , AT , INC , DEC , UNARY_MINUS , UNARY_PLUS , BNOT , LNOT , DOT , ARRAY_DECLARATOR , INDEX_OP .	3.0

Examples

To configure the check:


<module name="Checker">
  <module name="TreeWalker">
    <module name="NoWhitespaceAfter"/>
  </module>
</module>

Example:


class Example1 {
  public void lineBreak(String x) {
    Integer.
        parseInt(x);
    Integer.parseInt(x);
  }

  public void dotOperator(String s) {
    Integer.parseInt(s);
    Integer. parseInt(s); // violation ''.' is followed by whitespace'
  }

  public void arrayDec() {
    int[] arr;
    int [] array; // violation ''int' is followed by whitespace'
  }

  public void bitwiseNot(int a) {
    a = ~ a; // violation ''~' is followed by whitespace'
    a = ~a;
  }
}

To configure the check to forbid linebreaks after a DOT token:


<module name="Checker">
  <module name="TreeWalker">
    <module name="NoWhitespaceAfter">
      <property name="allowLineBreaks" value="false"/>
      <property name="tokens" value="DOT"/>
    </module>
  </module>
</module>

Example:


class Example2 {
  public void lineBreak(String x) {
    Integer.
        parseInt(x); // violation above ''.' is followed by whitespace'
    Integer.parseInt(x);
  }

  public void dotOperator(String s) {
    Integer.parseInt(s);
    Integer. parseInt(s); // violation ''.' is followed by whitespace'
  }

  public void arrayDec() {
    int[] arr;
    int [] array;
  }

  public void bitwiseNot(int a) {
    a = ~ a;
    a = ~a;
  }
}

Example of Usage

Violation Messages

ws.followed

All messages can be customized if the default message doesn't suit you. Please see the documentation to learn how to.

Package

com.puppycrawl.tools.checkstyle.checks.whitespace

Parent Module

TreeWalker