thread help

hi
i have this code and i need some help if possible, i need to enter a new method in the StringCycler class so that each a is always immediately followed by a b.
can anyone help?

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1. class StringCycler implements Runnable
2. {
3.     private String s;
4.  
5.     public StringCycler(String s)
6.     {
7.         this.s = s;
8.     }
9.  
10.     private void printChar(int i)
11.     {
12.         System.out.println(this.s.charAt(i));
13.     }
14.  
15.     private void cycle()
16.     {
17.         for (int i = 0; i < this.s.length(); i++)
18.         {
19.         this.printChar(i);
20.         }    
21.     }
22.  
23.     public void run()
24.     {
25.         for (;;)
26.         {    
27.         this.cycle();
28.         }
29.     }
30. }
31.  
32. public class Main
33. {
34.     public static void main(String[] args)
35.     {
36.     StringCycler c = new StringCycler("abc");
37.     Thread t1 = new Thread(c);
38.     Thread t2 = new Thread(c);
39.     t1.start();
40.     t2.start();
41.     }
42. }
43.  

What are you using the threads for here. For the method that you want to write you will need a StringBuilder variable and go thorough the given String appending the string's characters to that variable accordingly.