java - How to replace a char with a string -

i know replacing char string can't done, i'm trying make morse code translating program , have 2 arrays 1 letters , 1 morse code translation! have used stringtokenizer , want take every character of word , replace translation of character in morse code! how can done?

here part of code matters:

stringtokenizer tokenizer = new stringtokenizer(line);         while (tokenizer.hasmoretokens()) {             string token = tokenizer.nexttoken();             if (isword(token)) {                 (int j = 0; j < token.length(); j++) {                     char ch = token.charat(j);                     (int k=0; k<26; k++){                         if (ch==((char)letter[k])){                             ch=(char)morse[k];                         }                     }                 }             system.out.print(token);             }         } 

you can use stringbuilder this. given have 1 array chars, can iterate on each char , append translated variant stringbuilder object.

example:

    char[] chars = {'h', 'e', 'l', 'l', 'o'};     stringbuilder sb = new stringbuilder();     (char c : chars) {         sb.append(getmorse(c));     }     system.out.println(sb.tostring()); 

where getmorse() function returns string containing morse code variant of char.