question: public static boolean isPunc ( String str ) { if ( str == null ) return false ; str = str . trim ( ) ; for ( int i = 0 ; i < str . length ( ) ; ++ i ) { char c = str . charAt ( i ) ; if ( Character . isDigit ( c ) || Character . isLetter ( c ) ) { return false ; } } return true ; }
target:  Checks if is punctuation.