Java Caesar Cipher replacing a char in a string with an array value -


okay, school project attempting make method take file, use caesar cipher 'encrypt' it, , output new encrypted word output file, reading in words of file leave separate encrypted file.

the problem i'm running

"unexpected type. required: variable. found: value" error

whenever try replace character new one.

here's encryption method, enough find problem.

public static void encrypt(file inputfile, int key) throws filenotfoundexception {     char[] alpha = new char[26];     for(char ch = 'a'; ch <= 'z'; ch++)     {         int = 0;         alpha[i] = ch;         i++;     }     scanner in = new scanner(inputfile);     while(in.hasnext())     {            string word = in.next();         word = word.tolowercase();         for(int = 0; < word.length(); i++)         {             for(int j = 0; j < alpha.length; j++)             {                 if(word.charat(i) == alpha[j])                 {                     word.charat(i) = alpha[j + key];                        }             }          }      }   }

as strings immutable can not 

word.charat(i) = alpha[j + key];

consider using stringbuilder instead, like

    stringbuilder buf = new stringbuilder ();     for(int = 0; < word.length(); i++)     {         for(int j = 0; j < alpha.length; j++)         {             if(word.charat(i) == alpha[j])             {                 buf.append(alpha[j + key]);             }             else {                 buf.append (word[i]); // ??             }         }     }      // buf ??

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