Solved Interleaved config entries

I have a question about the config file.
Is it possible to have an interleaved config file (see example)?

Code:

Trade:
  Input1:
    Material: ...
    Amount: ...
  Input2:
    Material: ...
    Amount: ...
  Output:
    Material: ...
    Amount: ...

So what I mean, is having different categories with subcategories and entries.

How do I write in those subcategories and read from them?

btw: I think this is called interleaved, but I'm german, so sorry, if that's the wrong word...

 

@ScrouthTV
Config#getConfigurationSection("Trade").getKeys(false) returns all the sub categories.

 

@ScrouthTV
It's possible . To get all of the main categories, in this case Input1, Input2 and Output, you'd use what ZombieStriker posted.
To create such categories, you need to get the config, then it would be like this:

PHP:

getConfig().set("Trade.Input1.Material", Material.AIR);
getConfig().set("Trade.Input2.Amount", 2532);
// And so on

Then to get it, you'd do what Zombie posted like so:

PHP:

for(String s : getConfig().getConfigurationSection("Trade").getKeys(false)) {
    Material material = getConfig().get("Trade." + s + ".Material"); // to get the material, but you'd have to use like Material.match
}

The above are just examples, the second one won't necessarily work but I hope you get the idea of what I'm going for.