Code

package eu.penguinpiz.slenderman.commands;

import java.io.File;
import java.io.IOException;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.entity.Player;

import eu.penguinpiz.slenderman.main.Main;

public class CoinSystem implements CommandExecutor{

	@Override
	public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
		Player p = (Player) sender;
		if(args.length == 0) {
			p.sendMessage(Main.PREFIX + "§7You Have §a" + getCoins(p.getName()));
		} else if(args.length == 3) {
			if(args[0].equalsIgnoreCase("add")) {
				if(p.hasPermission("sm.coind.add")) {
				String target = args[1];
				Integer amount = Integer.valueOf(args[2]);
				addCoins(target, amount);
				p.sendMessage(Main.PREFIX + "§7The Player §f" + target + " §aGot " + amount + " §f§lCoins");
				} else {
					p.sendMessage(Main.NO_PERMISSION);
				}
			}else if(args[0].equalsIgnoreCase("remove")) {
				if(p.hasPermission("sm.coind.remove")) {
				String target = args[1];
				Integer amount = Integer.valueOf(args[2]);
				removeCoins(target, amount);
				p.sendMessage(Main.PREFIX + "§7The Player §f" + target + " §cLost " + amount + " §f§lCoins");
				} else {
					p.sendMessage(Main.NO_PERMISSION);
				}
			} else if(args[0].equalsIgnoreCase("set")) {
				if(p.hasPermission("sm.coind.set")) {
				String target = args[1];
				Integer amount = Integer.valueOf(args[2]);
				setCoins(target, amount);
				p.sendMessage(Main.PREFIX + "§7The §f§lCoins §7of " + target + " §7were §aSet §7to " + amount);
				} else {
					p.sendMessage(Main.NO_PERMISSION);
				}
			} else {
				p.sendMessage(Main.PREFIX + "§7System §aOutDated§7! §7:D");
			}
		} else {
			p.sendMessage(Main.PREFIX + "§7System §aOutDated§7! §7:D");
		}
		return false;
	}

	public Integer getCoins(String name) {
		File file = new File("plugins/SlenderMan", "coins.yml");
		FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);

		int coins = cfg.getInt(name + ".coins");
		return coins;
	}

	public void addCoins(String name, int amount) {
		File file = new File("plugins/SlenderMan", "coins.yml");
		FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);

		int coins = cfg.getInt(name + ".coins");
		coins=coins+amount;
		cfg.set(name + ".coins", coins);
		try {
			cfg.save(file);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public void removeCoins(String name, int amount) {
		File file = new File("plugins/SlenderMan", "coins.yml");
		FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);

		int coins = cfg.getInt(name + ".coins");
		coins=coins-amount;
		cfg.set(name + ".coins", coins);
		try {
			cfg.save(file);
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public void setCoins(String name, int amount) {
		File file = new File("plugins/SlenderMan", "coins.yml");
		FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);

		cfg.set(name + ".coins", amount);
		try {
			cfg.save(file);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public boolean hasCoins(String name, int amount) {
		File file = new File("plugins/SlenderMan", "coins.yml");
		FileConfiguration cfg = YamlConfiguration.loadConfiguration(file);

		int coins = cfg.getInt(name + ".coins");
		if(coins >= amount) {
			removeCoins(name, amount);
			return true;
		} else
			return false;

	}

}