可靠地将任何对象转换为String，然后再次返回

是的，这称为序列化！

 String serializedObject = ""; // serialize the object try {     ByteArrayOutputStream bo = new ByteArrayOutputStream();     ObjectOutputStream so = new ObjectOutputStream(bo);     so.writeObject(myObject);     so.flush();     serializedObject = bo.toString(); } catch (Exception e) {     System.out.println(e); } // deserialize the object try {     byte b[] = serializedObject.getBytes();      ByteArrayInputStream bi = new ByteArrayInputStream(b);     ObjectInputStream si = new ObjectInputStream(bi);     MyObject obj = (MyObject) si.readObject(); } catch (Exception e) {     System.out.println(e); }