Listing A

import java.io.IOException;

import java.util.logging.Level;

import java.util.logging.Logger;

import java.util.logging.FileHandler;
 

public class JavaLoggingExample {

       private static Logger logger = Logger.getLogger(JavaLoggingExample.class.getName());
 

   public JavaLoggingExample () {

      try {

         FileHandler fileHandler1 = new FileHandler("logtest.txt");

         logger.addHandler(fileHandler1);

      }

      catch(IOException ioe) {

         logger.log(Level.SEVERE, "Unable to create file handler.", ioe);

      }

              logger.log(Level.SEVERE, "This is a severe level message!");

              logger.log(Level.SEVERE, "This is a second severe level message!");

   }
 

   public void testLog() {

              logger.info("Message sent from method call.");

       }
      

   public static void main(String[] args) throws java.io.IOException {

              JavaLoggingExample example = new JavaLoggingExample();

              example.testLog();

       }

}