Java OCA OCP Practice Question 3032

public class Main {
   static StringBuffer sb;
   StringBuffer sb2;//from  ww  w .  j  av  a2s.  c  om

   public static void main(String[] args) {
      sb = sb.append(new Main().go(new StringBuffer("Python")));
      System.out.println(sb);
   }

   {
      sb2 = new StringBuffer("Ruby ");
   }

   StringBuffer go(StringBuffer s) {
      System.out.print(s + " SQL " + sb2);
      return new StringBuffer("MySQL");
   }

   static {
      sb = new StringBuffer("Java ");
   }
}