question: public boolean isBlank ( final CharSequence cs ) { int strLen ; if ( cs == null || ( strLen = cs . length ( ) ) == 0 ) { return true ; } for ( int i = 0 ; i < strLen ; i ++ ) { if ( ! Character . isWhitespace ( cs . charAt ( i ) ) ) { return false ; } } return true ; }
target:  Checks if a CharSequence is whitespace, empty ("") or null.