利用串行化来做深复制

public Object deepClone()
{
 //将对象写到流里
 ByteArrayOutoutStream bo=new ByteArrayOutputStream();
 ObjectOutputStream oo=new ObjectOutputStream(bo);
 oo.writeObject(this);
 //从流里读出来
 ByteArrayInputStream bi=new ByteArrayInputStream(bo.toByteArray());
 ObjectInputStream oi=new ObjectInputStream(bi);
 return(oi.readObject());
}