Since Checkstyle 3.0
Checks the padding of an empty for iterator; that is whether a white space is required at an empty for iterator, or such white space is forbidden. No check occurs if there is a line wrap at the iterator, as in
for (Iterator foo = very.long.line.iterator(); foo.hasNext(); )
name | description | type | default value | since |
---|---|---|---|---|
option | Specify policy on how to pad an empty for iterator. | PadOption | nospace |
3.0 |
To configure the check:
<module name="Checker"> <module name="TreeWalker"> <module name="EmptyForIteratorPad"/> </module> </module>
Example:
class Example1 { Map<String, String> map = new HashMap<>(); void example() { for (Iterator it = map.entrySet().iterator(); it.hasNext();); for (Iterator it = map.entrySet().iterator(); it.hasNext(); ); // violation above '';' is followed by whitespace' for (Iterator foo = map.entrySet().iterator(); foo.hasNext(); ); } }
To configure the check to require white space at an empty for iterator:
<module name="Checker"> <module name="TreeWalker"> <module name="EmptyForIteratorPad"> <property name="option" value="space"/> </module> </module> </module>
Example:
class Example2 { Map<String, String> map = new HashMap<>(); void example() { for (Iterator it = map.entrySet().iterator(); it.hasNext();); // violation above '';' is not followed by whitespace.' for (Iterator it = map.entrySet().iterator(); it.hasNext(); ); for (Iterator foo = map.entrySet().iterator(); foo.hasNext(); ); } }
All messages can be customized if the default message doesn't suit you. Please see the documentation to learn how to.
com.puppycrawl.tools.checkstyle.checks.whitespace