ConfigApi.java

import org.bukkit.configuration.Configuration;
import org.bukkit.configuration.InvalidConfigurationException;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.plugin.Plugin;
import java.io.File;
import java.io.IOException;

public class ConfigApi {
   private static Plugin p;
    private static Map<String, ConfigApi> configs;
    public static void enable(Plugin p) {
        ConfigApi.p = p;
        ConfigApi.configs = new HashMap<>();
    }

    public static ConfigApi getConfig(String fileName) {
        if (configs.containsKey(fileName.toLowerCase())) {
            return configs.get(fileName);
        }
        if (p == null) {
            throw new NullPointerException("Plugin initialize feilet!");
        }
        File file = new File(p.getDataFolder(), fileName);
        if (!file.exists()) {
            file.getParentFile().mkdirs();
            p.saveResource(fileName, false);
        }
        return new ConfigApi(file, fileName);
    }
    private FileConfiguration c;
    private ConfigApi(File config, String name) {
        c = new YamlConfiguration();
        try {
            c.load(config);
        } catch (IOException | InvalidConfigurationException e) {
            e.printStackTrace();
        }
        configs.put(name.toLowerCase(), this);
    }

    private ConfigApi() { }

    public Configuration getConfig() {
        return c;
    }
}