创建没有现有类的对象

Question

I would like to know if it is possible to create a "temporary" object (at runtime) of a class that does not exist, and create fields for that object.

I'm parsing a text file for which I would need to create manually hundreds, if not more, of classes to store (and later write) all the data represented in this file.

That file would look like :

person,John,28,USA,Male
person,Rebecca,25,USA,Female

... later ...

address,John,...
address,Rebecca,..

I would like to make a method that will, when metting a new kind of data (here, a Person or an Address), create an object of the corresponding class (Person.class or Address.class), class that doesn't exist in my src code.

Then, I'll split the line around (",") and for each String, create a new Field for that new Object and put the value inside.

EDIT :

Found dexmaker that seems to be what I need, but will I be able to use the dexmaker generated class to build an output xml using JAXB/DOM or other similar implementations ?

Thanks

Answer 1

You can use a HashMap<String, String> as your flexible object: every key (fieldname) refers to a field value.

For every type (Address, Person) add a HashMap, and for keeping trac of the type-hashmaps, well use a HashMap<String, HashMap<String, String>> :)

This works a bit like javascript objects which are in effect associative arrays.

Answer 2

You can have any class which holds String key and values in a Properties container. Not sure why is usefully...

For SQL there are ORM frameworks, which will do your job automatically, if you have linked the library and configured properly.

Answer 3

Why you need temporary object ? If you really do not want to create any class in source code then , you can take a help of Collections.Use a suitable collection for keeping the data for short period of time.

They are predefined , no need to create any class for that.You can use HashMap,HashTable,etc.

Answer 4

For storing parsing data, you can use Collections class utilities. I am also working on parsing files, i always prefer to use Map,List. Java provides these things for fast development, no time wasting. Create an object for every new data and compare these objects for storing only different typs of objects in Map..