Language file

public Lang(FileConfiguration language){
    try{
        Field[] fields = this.getClass().getFields();
        for(Field field:fields){
            String name = field.getName();
            if(!name.toUpperCase().equals(name))continue;
            field.setAccessible(true);
            if(!language.contains(name)){
                language.set(name, field.get(this));
            }
            field.set(this, language.get(name));
        }
    }catch(Exception e){
        e.printStackTrace();
    }
}