java - Morse code decoding - 1 word -

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i working on encoding/decoding morse code program in java. i'm having trouble decoding. i'm working strictly uppercase alphabet , 1 word. no sentences. when debugged, program infinitely loops between lines 1 & 2. here have far: 

m[0] = .-; m[25] = --..;  string decode (string m) {     m = m + " ";     string temp = "";     string word = "";      {         temp = m.substring(0,m.indexof(" "));  //line 1           (int = 0; < m.length(); i++) {             if (temp.equals(m[i])){      // line 2                 word += (char)i + 'a';                 m = m.substring(m.indexof(" " + 1));             }          }     } while (m.contains(" "));      return word; }

try changing line inside loop this:

 m = m.substring(m.indexof(" ")+1);

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