Copying contents of a HashMap to a ConfigurationFile

So I have this code:

Code:java

 
public class Main extends JavaPlugin {
    public FileConfiguration fc = null;
    public HashMap<String, Integer> cCount = new HashMap<String, Integer>();
 
    @Override
    public void onEnable() {
    File f = new File(getDataFolder(), "/playerData.yml");
    if (!f.exists()) {
        try {
        f.createNewFile();
        } catch (IOException e) {
        e.printStackTrace();
        }
    }
    fc = YamlConfiguration.loadConfiguration(f);
    PluginManager pm = Bukkit.getPluginManager();
    super.onEnable();
    }
 
    @Override
    public void onDisable() {
    for(int i = 0; i < cCount.size(); i++) {
        String key = null;
        Integer amount = cCount.get(i);
        fc.set(key, amount);
    }
    super.onDisable();
    }
}
 

in the onDisable is where I am trying to get the contents of HashMap cCount and put them into the file "fc" as Key: Object. The problem I have is that I do not know how to put the contents of the HashMap into the file

 

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