ConfigManager.java

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

import org.bukkit.configuration.InvalidConfigurationException;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.plugin.java.JavaPlugin;

public class ConfigManager {
        private final JavaPlugin plugin;

        private File configFile;
        private FileConfiguration config;

        public ConfigManager(JavaPlugin plugin, String fileName) {
            if (plugin == null) throw new IllegalArgumentException("plugin cannot be null");
            if (!plugin.isInitialized()) throw new IllegalArgumentException("plugin must be initiaized");

            this.plugin = plugin;
            this.config = this.plugin.getConfig();
            this.configFile = new File(plugin.getDataFolder(), fileName);
            this.configFile.getParentFile().mkdir();
        }

        public Object get(String path)
        {
            return get(path,"");
        }

        public List<String> getList(String path)
        {
            return (List<String>) this.config.getList(path);
        }

        public List<String> getList(String path, List<String> def)
        {
            return (List<String>) this.config.getList(path, def);
        }

        public Object get(String path,Object def)
        {
            Object obj = this.config.get(path);
            if(obj == null)
            {
                set(path,def);
                if(def instanceof String)
                {
                    return replaceColors((String)def);
                }
                else
                {
                    return def;
                }
            }
            else
            {
                if(def instanceof String)
                {
                    return replaceColors((String)obj);
                }
                else
                {
                    return obj;
                }
            }
        }

        public void set(String path,Object value)
        {
            this.config.set(path,value);
        }

        public void save()
        {
            try {
                this.config.save(configFile);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void load()
        {
            if(configFile.exists())
            {
                try {
                    this.config.load(configFile);
                } catch (IOException | InvalidConfigurationException e) {
                    e.printStackTrace();
                }
            }

        }

        private String replaceColors (String message) {
            return message.replaceAll("(?i)&([a-r0-9])", "\u00A7$1");
        }

}