java - Error Expected int but given string -

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i'm getting error. it's saying it's expecting int, i'm giving string. i'm not sure how fix this.

int dnastrandlength, stranddna;         scanner dnainfo = new scanner (system.in);      system.out.println ("please enter dna strand!");         stranddna = dnainfo.next();         dnastrandlength = stranddna.length();

you have declare stranddna string. 

int dnastrandlength; string stranddna; scanner dnainfo = new scanner (system.in);  system.out.println ("please enter dna strand!"); stranddna = dnainfo.next(); dnastrandlength = stranddna.length();

if reading int have nextint() scanner.


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