GG

 public final class Test
{
 Test left;
 Test right;

 static Test CreateTree(int n)
 {
  if(n <= 0) return null;
  Test t = new Test();
  t.left = CreateTree(n - 1);
  t.right = CreateTree(n - 1);
  return t;
 }

 public static void main( String[] arg )
 {
  long start = System.currentTimeMillis();
  for(int i = 0;i < 15;i++)
  {
   CreateTree(22);
   System.gc();
  }
  long end = System.currentTimeMillis();
  System.out.println( "Time: " + ( end - start ) + " ms" );
 }
}