Logging (不常用)

import java.util.logging.Logger;

public class Main {
    public static void main(String[] args) {
        Logger logger = Logger.getGlobal();
        logger.info("Start process");
        logger.warning("Memory is running out");
        logger.fine("ignore");
        logger.severe("Process will be terminated...");
    }
}

>>>
Oct 23, 2019 9:00:25 AM Main main
INFO: Start process
Oct 23, 2019 9:00:25 AM Main main
WARNING: Memory is running out
Oct 23, 2019 9:00:25 AM Main main
SEVERE: Process will be terminated...