Solved Efficient way to remove and add ArrayList<String>

hey guys,

I am making a plugin and i want to know a more efficient way to add and remove arraylists
Right now i first remove all lists and then add the list i want, but that takes a lot of time to write.

right now i have something like this (this is not my actual plugin, just an example):

Code:

private List<String> carrot = new ArrayList<String>();
private List<String> potato = new ArrayList<String>();
private List<String> apple = new ArrayList<String>();

public boolean onCommand(CommandSender sender, Command cmd, String label, String [] args){
    Player p = (Player) sender;
    if(cmd.getName().equalsIgnoreCase("add")){
        if(args.length >= 2){
        p.sendMessage(ChatColor.DARK_RED+"Too many arguments");   
        }
        if(args.length == 1){
        if(args[0].equalsIgnoreCase("apple")){

        carrot.remove(p.getName());
        potato.remove(p.getName());
        apple.add(p.getName());
        p.sendMessage(ChatColor.GREEN+"" You have selected the 'apple' ");
        }

 

@WHQ maybe try to make a method that will do that.

 

@tkuiyeager1

Yeah im thinking about doing something with:

ArrayList<String>().clear();

i have no idea if it works though and how to do that

 

@WHQ i didnt mean to that, i meant to a method that you will create your self, the method will remove the player from the other lists and add him to the list you want.

 

@WHQ Why do you have 3 lists? Why not just a HashMap?
Also store UUID not name

 

No it doesn't unless you are adding tons to the ArrayList (even then it's still fast). But a better Collection to use would be a Set. Use a HashSet.

 

@teej107 @bwfcwalshy @tkuiyeager1
thanks for all your advice, i will try to look into hashmaps, my java knowledge is pretty limited so maybe it wasn't the brightest idea to make bukkit plugins right away

For now this thread is solved