String to string B A conversion, a conversion only once, each time a character conversion should convert all of the A string into another character, whether the transition successfully

public  class DemoTest { 

    public  static  void main (String [] args) { 
        the System. OUT .println (isConvert ( " ABC " , " DDC " , 0 )); 
    } 

    / * * 
     * There is a string A string B want to convert from a to B, a conversion only once, each time a character conversion should convert all of the a string into another character, 
     * a can find the string into a string B. For example, "abc" - "bbc" --- "ddc" is satisfied is determined conversion 
     * 
     * / 
    public  static Boolean isConvert (A String, String B, int index) {
         // string into a character array 
        char [] C11 =A.toCharArray ();
         char [] C21 = B.toCharArray ();
         // Get the character to replace the 
        char m = C21 [index];
         // Get the replaced character 
        char F = C11 [index];
         // iterate original character array 
        for ( int I = 0 ; I <c11.length; I ++ ) {
             // if the same character and the need to replace the 
            IF (C11 [I] == F) { 
                C11 [I] = m; 
            } 
        } 
        / / character array to a String 
        A = arrayToString (C11); 
        B =arrayToString (C21); 

        // determine if it is a last 
        IF ((index == A.length () - . 1 )) {
             IF (. A.trim () the equals (B.trim ())) {
                 return  to true ; 
            } the else {
                 return  to false ; 
            } 
        } 
        index ++ ;
         // recursive Analyzing 
        return isConvert (A, B, index); 

    } 

    public  static String arrayToString ( char [] C) { 
        the StringBuilder SB = new new StringBuilder();
        for (int i = 0; i < c.length; i++) {
            sb.append(c[i]);
        }
        return sb.toString();
    }
}