java - I asked a question about arrays before, but this one won't compile -


i asked array little while ago, , can't see problem is. tired. have done wrong? basically, taking string array , trying check see if contains numbers or x (isbn number validation). want take number given input (booknum), check input, , feed valid input new array (book). @ line 

'booknum.charat[j]==book[i]'

i 'not statement error'. gives?

  string[] book = new string [isbn_num];   booknum.replaceall("-","");   if (booknum.length()!=isbn_num)     throw new isbnexception ("isbn "+ booknum + " must 10 characters");   (int i=0;i<booknum.length();i++)   {       if (character.isdigit(booknum.charat(i)))       booknum.charat[j]==book[i];       j++;       if (book[9].isnotdigit()||            book[9]!="x"        ||           book[9]!="x")       throw new isbnexception ("isbn " + booknum + " must contain digits" +                                 "or 'x' in last position");

there few odd problems here. starters, did mean book array of strings, opposed 1 string? you're trying (assuming charat written , assignment proper) assign character string.

second, instead of copying character character, why not check whole string, , copy whole thing @ end if proper isbn? depending on exceptions (if continue regardless), add boolean flag gets set if there error. @ end, if there no error, make book = booknumber.replace(etc...)


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