Checks for whitespace

Tab characters

The property checkstyle.allow.tabs controls whether to silently allow lines that contain tab ('\t') characters. The property type is boolean and defaults to false.

Surrounding Whitespace

The property checkstyle.ignore.whitespace controls whether to check whitespace. It overrides all the other properties in this section. The property type is boolean and defaults to false.

The following checks are performed:

Binary operators are separated from operands by spaces. For example x = y + 1;
Unary operators are not separated by spaces. For example x = --y + z++;
The keywords if/for/while/do/catch/synchronized/return are surrounded by spaces.
Casts and commas (',') are followed by whitespace.
Periods ('.') are not surrounded by whitespace.
Correct padding of parenthesises ()'s.

The property checkstyle.ignore.whitespace.cast controls whether to ignore checking for whitespace after a cast. The property type is boolean and defaults to false.

The property checkstyle.paren.pad specifies the policy on how parenthesises are to be padded. The property type is pad parenthesis policy and defaults to nospace.

Line wrapping on operators

The property checkstyle.wrap.operator specifies the policy on how to wrap lines on operators. The property type is wrap operator policy and defaults to nl.