Here is an example of using the LoggerComparator class from the logback.classic package in Java:

import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.spi.LoggerComparator;
import java.util.Set;
import java.util.TreeSet;

public class Example {
    public static void main(String[] args) {
        LoggerContext context = new LoggerContext();
        Logger rootLogger = context.getLogger(Logger.ROOT_LOGGER_NAME);
        Logger fooLogger = context.getLogger("foo");
        Logger barLogger = context.getLogger("bar");

        Set<Logger> loggers = new TreeSet<>(new LoggerComparator());
        loggers.add(rootLogger);
        loggers.add(fooLogger);
        loggers.add(barLogger);

        for (Logger logger : loggers) {
            System.out.println(logger.getName());
        }
    }
}

In this example, We create a LoggerContext and get three loggers: the root logger, and two other loggers named "foo" and "bar".

We then create a TreeSet to store the loggers, and pass in an instance of the LoggerComparator class as the comparator to use when sorting the loggers. The LoggerComparator class compares loggers based on their name, so the loggers in the set will be sorted alphabetically based on their name.

After adding all the loggers to the set, we iterate over the loggers and print out the name of each logger.

You can see that loggers are getting sorted based on their names as rootLogger, barLogger, fooLogger based on the alphabetical order.

You need to add logback classic library in the classpath to use this example.