How can I alter this Java method so that I convert and then return every sentenc

Question

How can I alter this Java method so that I convert and then return every sentence in the array of strings to an array of chars? As of now I can only get the first sentence into the char array but I need all 5 sentences.

public static char[] charConvert ( String [] sentences ) {
int totLength = sentences[0].length() + sentences[1].length() + sentences[2].length() + sentences[3].length() + sentences[4].length();
char [] letter = new char[totLength];
int x = 0;
int y = 0;
  
while ( y < sentences[x].length() ) {
switch ( sentences[x].charAt(y) ) {
case 'a': case 'A':
letter[y] = 'N';
break;

case 'b': case 'B':
letter[y] = 'O';
break;

case 'c': case 'C':
letter[y] = 'P';
break;

case 'd': case 'D':
letter[y] = 'Q';

default: break;
}
y++;
  
}

return letter;

}

Explanation / Answer

public static char[] charConvert(String[] sentences) {
       int totLength = sentences[0].length() + sentences[1].length() + sentences[2].length() + sentences[3].length()
               + sentences[4].length();
       char[] letter = new char[totLength];
       int x = 0;
       int y = 0, z = 0;

       for (int i = 0; i < sentences.length; ++i) {
           String str = sentences[i];
           z = 0;
           while (y < totLength && z < str.length()) {
               switch (str.charAt(z)) {
               case 'a':
               case 'A':
                   letter[y] = 'N';
                   break;

               case 'b':
               case 'B':
                   letter[y] = 'O';
                   break;

               case 'c':
               case 'C':
                   letter[y] = 'P';
                   break;

               case 'd':
               case 'D':
                   letter[y] = 'Q';

               default:
                   break;
               }
               y++;
               z++;

           }
       }

       return letter;

   }
=================================================================================

Thanks, let me know if there is any concern. I will be happy to modify and make it work for you.

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