public static boolean isWhitespace ( String s ) { // Is s empty? if ( isEmpty ( s ) ) return true ; // Search through string's characters one by one // until we find a non-whitespace character. // When we do, return false; if we don't, return true. for ( int i = 0 ; i < s . length ( ) ; i ++ ) { // Check that current character isn't whitespace. char c = s . charAt ( i ) ; if ( whitespace . indexOf ( c ) == - 1 ) return false ; } // All characters are whitespace. return true ; }
Returns true if string s is empty or whitespace characters only .