The compiler ignores bogus suboptions to -Xlint and compiles as if no -Xlint options were used. It should give an error message as a user's typo of one of these may result in misinterpretting results.
eg., javac -Xlint:unchekced (instead of -Xlint:unchekced ) will not be rejects, neither will
javac -Xlint:blah
.