Exploring Advanced Language Features - Beginning Java 7 - page 199

System.out.println("writing "+msg+" to file "+d-
stName);
return true;

}

}

Unlike Console , File requiresaonnullargument.Eachmethodfirstverifiesthat
thisargumentisnot null .Iftheargumentis null ,themethodreturnsfalsetosignify
failure. (In Chapter 8 , I refactor File to incorporate appropriate file-writing code.)
Thelogginglibraryallowsustointroduceportableloggingcodeintoanapplication.
Apart from a call to newLogger() , this code will remain the same regardless of the
logging destination. Listing 3-21 presents an application that tests this library.

Listing 3-21. Testing the logging library

import logging.Logger;
import logging.LoggerFactory;

class TestLogger
{

public static void main(String[] args)
{

Logger logger = LoggerFact-

ory.newLogger(LoggerFactory.CONSOLE);
if (logger.connect())
{

logger.log("test message #1");
logger.disconnect();

}
else
System.out.println("cannot connect to console-
based logger");
logger = LoggerFactory.newLogger(LoggerFactory.FILE,
"x.txt");
if (logger.connect())
{

logger.log("test message #2");