POGOs Example

//This Class handles reading and writing of POGOs
public class FileHandler {

    public void createDirectory(String dirName) {
        File file = new File(dirName);
        if (!file.exists()) {
            file.mkdirs();
        }
    }

    public Object readfromJson(String file, Class<?> objClass){
        Gson gson = new Gson();
        try (Reader reader = new FileReader(file)) {
            Object newObject = gson.fromJson(reader, objClass);
            return newObject;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    public void writetoJson(String file, Object object){
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        try (FileWriter writer = new FileWriter(file)) {
            gson.toJson(object, writer);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

//Call this in onGuildcreate event

    //init Custom Commands
        file = "CommandLists/" + readableGuildID + "_CustomCommands.json";
        CustomCommands customCommands = new CustomCommands();
        if (!Files.exists(Paths.get(file))) {
            handler.writetoJson(file, customCommands);
            logger.info("Creating Custom Commands List");
        }

//to get the data

    //loads the custom commands for the Guild.
        file = "CommandLists/" + readableGuildID + "_CustomCommands.json";
        CustomCommands customCommands = (CustomCommands) handler.readfromJson(file, CustomCommands.class);


//Custom commands Class as an example
public class CustomCommands {

    ArrayList<String[]> commands = new ArrayList<String[]>();
    final String commandNotFound = "No Command with that name found.";

    public String createCommand(String userID, String commandName, String response){
        boolean noDuplicate = true;
        for (String[] sA : commands){
            if (sA[1].equalsIgnoreCase(commandName)){
                noDuplicate = false;
            }
        }
        if (noDuplicate) {
            String[] newEntry = new String[3];
            newEntry[0] = userID;
            newEntry[1] = commandName;
            newEntry[2] = response;
            commands.add(newEntry);
            return "Command Added";
        }
        return "A Command with that name already exists, Cannot create command.";
    }

    public String getCommand(String commandName){
        for (String[] cA: commands){
            if (cA[1].equalsIgnoreCase(commandName)){
                return cA[2];
            }
        }
        return commandNotFound;
    }

    public String removeCommand(boolean isMod, String userID, String commandName){
        for (String[] sA : commands){
            if (sA[1].equalsIgnoreCase(commandName)){
                if (sA[0].equalsIgnoreCase("LockedCommand")){
                    return "This command cannot be removed";
                }
                if (isMod || sA[0].equals(userID)){
                    commands.remove(sA);
                    return "Command Removed";
                }
                return "You Do not have Permission to Remove this command";
            }
        }
        return "A command with that name does not exist";
    }

    public String listCommands(){
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append("Here is the List of Custom Commands");
        for (String[] sA : commands){
            stringBuilder.append("\n  "+ sA[1]);
        }
        return stringBuilder.toString();
    }
}

//how i call the command

    if (message.toString().toLowerCase().startsWith(Globals.CCPrefix.toLowerCase())) {
        StringBuilder CCName = new StringBuilder();
        CCName.append(message.toString());
        CCName.delete(0, Globals.CCPrefix.length());
        String CCResponse = customCommands.getCommand(CCName.toString());
        CCResponse = CCResponse.replaceAll("#author#", message.getAuthor().getName());
        channel.sendMessage(CCResponse);
    }