What is the result(class instance variables)? : Questions « Utility Classes « SCJP

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class Box {
    int size;
    Box(int s) { size = s; }
  }

  public class MainClass{
    public static void main(String[] args) {
      Box b1 = new Box(5);
     Box[] ba = go(b1, new Box(6));
     ba[0] = b1;
     for(Box b : ba) System.out.print(b.size + " ");
   }
   static Box[] go(Box b1, Box b2) {
      b1.size = 4;
      Box[] ma = {b2, b1};
      return ma;
   }
 }