Solved Help Keepin ArrayList in a File

Hey guys, so, I want to keep the ArrayList even after i reload my server, bug to do this i need to store my arraylist in a file.

It would be easy to do like 2 months ago, but I was having so much trouble with family and school that I just came back to java and bukkit right now, and I completely forgot how to save my ArrayList in a file.

I`ve read some other questions in the forum, and read some posts in other sites but i couldn`t understand it at all. If you guys could help me, here we go:

THIS IS ALL THE ARRAYLISTS I WANT TO SAVE

Code:

public static ArrayList<String> booked = new ArrayList<String>();
    public static ArrayList<String> mage = new ArrayList<String>();
    public static ArrayList<String> warrior = new ArrayList<String>();
    public static ArrayList<String> paladin = new ArrayList<String>();

 

@HenrySartori
Personally, I'd opt for a regular List<String>, then just create a new config path with the list as a value.

 

@HenrySartori First thing, its bad to have Arrays classified as static. As @RenditionsRule said, should use a List<String> instead as such.

Code:

List<String> mage = new ArrayList<String>();

Now to help you, just store it into a yaml file.

Code:

public void onDisable() {
  int i = 0;
  List<String> booked = new ArrayList<String>();
  for (String books : booked) {
  getConfig().createSection("books." + i + books);
  i++;
  }
}

and then to retrieve it just do this.

Code:

List<String> booked = new ArrayList<String>();
for (String books : getConfig().getConfigurationSection("books").getKeys(false)) {
booked.add(books);
}

 

@frostalf

They aren't arrays, they're Lists, and using the parent type doesn't really change anything.

@HenrySartori

Judging by context, these are players, and you should be storing their UUIDs instead. I.e. List<UUID>

 

@mythbusterma
Whether you use the ArrayList<> or List<>, it won't change the fact of how to iterate them and placing them in a file such as yaml. Nor does it change how to iterate the yaml file and placing them back into a List or ArrayList.

But you are correct that my example code doesn't make use of the ArrayList functions as I am using the parent of it.

 

DUDE, I LOVE YOOUUU!
Thanks bro, that createSection was the thing i couldn't remember, now i can end my plugin =3
thanks dude!

 

@HenrySartori Change them Lists to a Map<String/Enum, UUID> then you can use 1 Map rather than 5 Lists

 

@HenrySartori
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