以下程序可否编译通过，如果不能，请指出其错误.

public class Forest implements Serializable{

  private Tree tree = new Tree();，

   public static void main(String[] args){

      Forest f = new Forest();

         try{

           FileOutputStream fs = new FileOutputStream("Forest.Ser");

            ObjectOutputStream os=new FileOutputStream(fs);

            os.writeObject(f);

                 os.close();

              }catch(Exception ex){

                 ex.printStackTrace();

              }

        }

}

Public class Tree{

}