OperatorWrap

Since Checkstyle 3.0

Description

Checks the policy on how to wrap lines on operators.

Properties

name description type default value since
option Specify policy on how to wrap lines. WrapOption nl 3.0
tokens tokens to check subset of tokens QUESTION , COLON , EQUAL , NOT_EQUAL , DIV , PLUS , MINUS , STAR , MOD , SR , BSR , GE , GT , SL , LE , LT , BXOR , BOR , LOR , BAND , LAND , LITERAL_INSTANCEOF , TYPE_EXTENSION_AND , ASSIGN , DIV_ASSIGN , PLUS_ASSIGN , MINUS_ASSIGN , STAR_ASSIGN , MOD_ASSIGN , SR_ASSIGN , BSR_ASSIGN , SL_ASSIGN , BXOR_ASSIGN , BOR_ASSIGN , BAND_ASSIGN , METHOD_REF . QUESTION , COLON , EQUAL , NOT_EQUAL , DIV , PLUS , MINUS , STAR , MOD , SR , BSR , GE , GT , SL , LE , LT , BXOR , BOR , LOR , BAND , LAND , TYPE_EXTENSION_AND , LITERAL_INSTANCEOF . 3.0

Examples

To configure the check: 

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

Example: 

class Example1 {
  void example() {
    String s = "Hello" + // violation ''\+' should be on a new line'
      "World";

    if (10 == // violation ''==' should be on a new line'
            20) {
    }

    if (10
            ==
            20) { }

    int c = 10 /
            5; // violation above ''/' should be on a new line'

    int d = c
            + 10;
  }
}

To configure the check for assignment operators at the end of a line: 

<module name="Checker">
  <module name="TreeWalker">
    <module name="OperatorWrap">
      <property name="option" value="eol"/>
      <property name="tokens"
                value="ASSIGN,DIV_ASSIGN,PLUS_ASSIGN,MINUS_ASSIGN,STAR_ASSIGN,
                       MOD_ASSIGN,SR_ASSIGN,BSR_ASSIGN,SL_ASSIGN,
                       BXOR_ASSIGN,BOR_ASSIGN,BAND_ASSIGN"/>
    </module>
  </module>
</module>

Example: 

class Example2 {
  void example() {
    int b
            = 10; // violation ''=' should be on the previous line'
    int c =
            10;
    b
            += 10; // violation ''\+=' should be on the previous line'
    b +=
            10;
    c
            *= 10; // violation ''*=' should be on the previous line'
    c
            -= 5; // violation ''-=' should be on the previous line'
    c -=
            5;
    c
            /= 2; // violation ''/=' should be on the previous line'
    c
            %= 1; // violation ''%=' should be on the previous line'
    c
            >>= 1; // violation ''>>=' should be on the previous line'
    c
        >>>= 1; // violation ''>>>=' should be on the previous line'
    c
            &=1 ; // violation ''&=' should be on the previous line'
    c
            <<= 1; // violation ''<<=' should be on the previous line'
  }
}

Example of Usage

Violation Messages

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