Why is getFormattedMessage() needed?

Question

Java

Can you please tell me what the getFormattedMessage() method does in this case?

private static final MessageFactory MESSAGE_FACTORY = new ReusableMessageFactory();


    private static String determineLogMessage(String format, Object... args) {
        if (args == null || args.length == 0) {
            return forma;
        }
        return MESSAGE_FACTORY.newMessage(format, args).getFormattedMessage();
    }

I understand that you need to get a formatted string, but how exactly does he format it?

Answer 1

The factory creates a templated message by adding objects, and getFormattedMessage() returns a formatted string.
For example:

String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
Message message = new ReusableMessageFactory().newMessage("{} Very important message", date);
System.out.println(message.getFormattedMessage());

Will return a
2021-08-29 16:37:24 Very important message

String date = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
Message message = new ReusableMessageFactory().newMessage("{} [{}] Very important message", date, Level.WARN);
System.out.println(message.getFormattedMessage());

as you guessed it will print:
2021-08-29 16:43:57 [WARN] Very important message