Java: Set char at a particular position in a String

There a several ways to set a char at a particular position in a String.

String str = "IloveJavaProgramming"

1. Use the method setCharAt in StringBuilder. 
   
      StringBuilder sb = new StringBuilder(str);
      sb.setCharAt(2, 'i');
      sb.setCharAt(3, 'k');

      System.out.println(sb.toString());
   
      The output will be: IlikeJavaProgramming

2. Connect sub Strings.

      str.substring(0,2) + "ik" + str.substirng(4);

3. Use char array.

      char[] sa = str.toCharArray();
      sa[2] = 'i';
      sa[3] = 'k';
   
      str = new String(sa);

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